Engine Oils

[Divyanshp150]

Re: Engine Oils

Thanks divyansh bro,you are right everyone has got the right to express his views and opinions, (aapki mother ko meri taraf se Namaste) i got bit carried away by the words which i shouldn't have, but it's fine now, 15w20 oil the 20 figure is sounding strange to me, but as you are saying the engine is running cooler and smoother after pouring this oil, than it's ok, 1 to 3 mileage drop is not that very much, you are using this oil in your 4t bike can the same oil be used in 2t stroke bikes,if this oil can be used in 2t bikes then i will use it, i think that when the engine gets hot the oil comes to its operating temperature and hence works better because of which you are feeling the smoothness, what i feel(purely felt no technical proof) is that the fs oil should not be used in brand new engines because there is lot of rubbing and polishing in a brand new engine,metal gets cut so at that time normal mineral must be used and after maybe 10,000kms or so can switch to fs oils, what do you say.

15w40 bro I think I made a typo.
And u have a rx dont mess with oils use what you are using.
Rx100 is a gem of a bike.

divyansh....

[satyam2105sats]

Re: Engine Oils

Hmm I can see some serious discussions going I too have a little query about engine oils. (please ignore any obvious stupidity, I am a beginner)

I own a Bajaj Discover 125T (and sometimes I wonder if I am the only guy on earth who owns one), clocked around 800kms. The user manual recommends 20W50 grade engine oil for the bike. The first service of the bike was done when it had completed around 250kms and was 45 days old. Due to some circumstances, I was unable to take it to the SVC and hence my father took charge. For the oil change, the SVC guys told my dad that Castrol Activ 4T 20W40 would be the best and he agreed. Now I am a little worried about the engine because it is meant to churn out more power than usual 125cc bikes (12.5 ps at 9000rpm), and the engine is obviously expected to heat up a lot as its still in the run-in. In this situation, anything less than what is recommended would be a risk (This is my opinion).

So, my question is, would there be too much of a difference between 20w40 and 20w50? Should I change the engine oil to 20w50? If yes, should I get it done immediately or wait till the next scheduled change? I have also 'heard' that 20w50 would be less fuel-economical and after a short interval of use its going to be no better than 20w40, but both these factors aren't as worthy for me as the engine's health. The bike is not excessively or even moderately used, like about 5-10kms a day, so the FE and the cost of the oil won't be a very big issue. Any input from you guys is appreciated.

[Honda_abhi]

Re: Engine Oils

Hmm I can see some serious discussions going I too have a little query about engine oils. (please ignore any obvious stupidity, I am a beginner)

I own a Bajaj Discover 125T (and sometimes I wonder if I am the only guy on earth who owns one), clocked around 800kms. The user manual recommends 20W50 grade engine oil for the bike. The first service of the bike was done when it had completed around 250kms and was 45 days old. Due to some circumstances, I was unable to take it to the SVC and hence my father took charge. For the oil change, the SVC guys told my dad that Castrol Activ 4T 20W40 would be the best and he agreed. Now I am a little worried about the engine because it is meant to churn out more power than usual 125cc bikes (12.5 ps at 9000rpm), and the engine is obviously expected to heat up a lot as its still in the run-in. In this situation, anything less than what is recommended would be a risk (This is my opinion).

So, my question is, would there be too much of a difference between 20w40 and 20w50? Should I change the engine oil to 20w50? If yes, should I get it done immediately or wait till the next scheduled change? I have also 'heard' that 20w50 would be less fuel-economical and after a short interval of use its going to be no better than 20w40, but both these factors aren't as worthy for me as the engine's health. The bike is not excessively or even moderately used, like about 5-10kms a day, so the FE and the cost of the oil won't be a very big issue. Any input from you guys is appreciated.

The 125T is a technologically good bike. Dont worry about being the only guy on earth to own one. Sales will pick up if Bajaj doesnt discontinue it.
If the manual recommends 20W50 oil, then you should stick to 20W50 oil atleast till your bike is under warranty. please dont mess up with the oil grades. I t might badly screw up with engine life. Change to 20W50 oil as soon as possible

[devils_friend]

Re: Engine Oils

Hmm I can see some serious discussions going I too have a little query about engine oils. (please ignore any obvious stupidity, I am a beginner)

I own a Bajaj Discover 125T (and sometimes I wonder if I am the only guy on earth who owns one), clocked around 800kms. The user manual recommends 20W50 grade engine oil for the bike. The first service of the bike was done when it had completed around 250kms and was 45 days old. Due to some circumstances, I was unable to take it to the SVC and hence my father took charge. For the oil change, the SVC guys told my dad that Castrol Activ 4T 20W40 would be the best and he agreed. Now I am a little worried about the engine because it is meant to churn out more power than usual 125cc bikes (12.5 ps at 9000rpm), and the engine is obviously expected to heat up a lot as its still in the run-in. In this situation, anything less than what is recommended would be a risk (This is my opinion).

So, my question is, would there be too much of a difference between 20w40 and 20w50? Should I change the engine oil to 20w50? If yes, should I get it done immediately or wait till the next scheduled change? I have also 'heard' that 20w50 would be less fuel-economical and after a short interval of use its going to be no better than 20w40, but both these factors aren't as worthy for me as the engine's health. The bike is not excessively or even moderately used, like about 5-10kms a day, so the FE and the cost of the oil won't be a very big issue. Any input from you guys is appreciated.

Bajaj SVC using Castrol oil From when did they start using Castrol for bikes? The bike will not have any issues. You can use it.

Cheerz!!

[Divyanshp150]

Re: Engine Oils

Hmm I can see some serious discussions going I too have a little query about engine oils. (please ignore any obvious stupidity, I am a beginner)

I own a Bajaj Discover 125T (and sometimes I wonder if I am the only guy on earth who owns one), clocked around 800kms. The user manual recommends 20W50 grade engine oil for the bike. The first service of the bike was done when it had completed around 250kms and was 45 days old. Due to some circumstances, I was unable to take it to the SVC and hence my father took charge. For the oil change, the SVC guys told my dad that Castrol Activ 4T 20W40 would be the best and he agreed. Now I am a little worried about the engine because it is meant to churn out more power than usual 125cc bikes (12.5 ps at 9000rpm), and the engine is obviously expected to heat up a lot as its still in the run-in. In this situation, anything less than what is recommended would be a risk (This is my opinion).

So, my question is, would there be too much of a difference between 20w40 and 20w50? Should I change the engine oil to 20w50? If yes, should I get it done immediately or wait till the next scheduled change? I have also 'heard' that 20w50 would be less fuel-economical and after a short interval of use its going to be no better than 20w40, but both these factors aren't as worthy for me as the engine's health. The bike is not excessively or even moderately used, like about 5-10kms a day, so the FE and the cost of the oil won't be a very big issue. Any input from you guys is appreciated.

Relax you are fine. No issues as yet.
Ask the svc people if they can allow you to bring your own oil. And if they do then buy a motul , elf, veedol or shell 20w50 mineral oil, semi synthetic you can use after 5000 km
Your engine is new, and in runn in
Changethe engine oil to a 20w50 oil every 1000km and change the oil filter too. After 5000 km use 20w50 oil as long as it lasts (2000 to 2500 km)
The 125 st engine is a little heat sensitive I.e once the engine gets very hot it sounds very harsh even though its fine I guess.
Best 20w50 oil I used till date is motul 3100 gold 20w50
And motul 15w50 can also be used.
divyansh....

[kusmaker]

Re: Engine Oils

One cannot be sure for bajaj models , they will eventually replace this variant with some other kind of variant, but that is the way this company operates, but don't worry satyam you have bought a good bike, just change the oil as the bike's manuals suggests,you have already got fine answers by honda and divyanshp.

[Divyanshp150]

Re: Engine Oils

Xbhp was down since last night abhi tak:banghead:
I dont get this nervous when my gf dosent txt back! (hope she dosent read)
My bike is running cool even is this 42'c kolkata scorcher but thats coz I am doing short trips in open roads... college ka rasta is hellish bumper to bumper traffic...:P
I have a question
Will quenching a hot engine with water from the outside evenly with a spray bottle be bad for the engine?
(Havent tried it but have an idea!)
Will connect a small dc pump(30 to 50gm weight runs on dc used in some coolers) and 4 to 10 spray nozzels in a high pressure configuration with a 2 liter water bottle, (will cover it with thermacole to keep it cold under the seat and extend the plumbing)
Switch on and.... psssss.........it will douse the engine all around with cool water....that can spill on the road and ecaporate within few seconds/minutes!
Pros and cons of this idea and if it has no side effects will go ahead and impliment it. Will make for a sexy spray jet!
Truck racing tyres have these to cool the brakes!
divyansh....

[kusmaker]

Re: Engine Oils

And i thought i was the only one who was feeling this wierd when this site was not running, cooling the engine with water is little tricky i feel,liquid cooled engines have got the passages for the liquid, or coolant to pass through the cylinder block and head, the coolant at all the time is in indirect contact with such engine parts such as the combustion chamber, cylinder walls etc, water or coolant just absorbs heat as it passes through passage and cools itself down in a radiator,spraying cooled water directly on an hot engine i think should not be done,(purely my thought though) as metal is too hot and can develope microscopic cracks which will not be visible and can have adverse effect in longer duration.an air cooled engine shoudl always be cooled down slowly in a same way a sprinter or long distance runner cools down his body.Yes truck racing do use these methods to cool down there brakes, they use two types of braking techniques, one that injects mist into an conventional brake vent and for extreme racing or when racing in adverse conditions sprays a pressurised water stream directly on the brakes, but despite of spraying so much of water they change brakes for every race.

[Divyanshp150]

Re: Engine Oils

And i thought i was the only one who was feeling this wierd when this site was not running, cooling the engine with water is little tricky i feel,liquid cooled engines have got the passages for the liquid, or coolant to pass through the cylinder block and head, the coolant at all the time is in indirect contact with such engine parts such as the combustion chamber, cylinder walls etc, water or coolant just absorbs heat as it passes through passage and cools itself down in a radiator,spraying cooled water directly on an hot engine i think should not be done,(purely my thought though) as metal is too hot and can develope microscopic cracks which will not be visible and can have adverse effect in longer duration.an air cooled engine shoudl always be cooled down slowly in a same way a sprinter or long distance runner cools down his body.Yes truck racing do use these methods to cool down there brakes, they use two types of braking techniques, one that injects mist into an conventional brake vent and for extreme racing or when racing in adverse conditions sprays a pressurised water stream directly on the brakes, but despite of spraying so much of water they change brakes for every race.

Thank you so much mere bhai for the heads up!your logic is absolutely correct come to think of it!
I dot want to damage my beloved... hmmmm now have to think of a way to throw cold air on the engine.... hmmmm.....:P khurafati sochna hoga kuch
And damm you know a lot about truck racing!


divyansh....

[satyam2105sats]

Re: Engine Oils

The 125T is a technologically good bike. Dont worry about being the only guy on earth to own one. Sales will pick up if Bajaj doesnt discontinue it.
If the manual recommends 20W50 oil, then you should stick to 20W50 oil atleast till your bike is under warranty. please dont mess up with the oil grades. I t might badly screw up with engine life. Change to 20W50 oil as soon as possible

I was thinking the same. Though the SVC is 'user friendly' and says that they'll take care of the warranty (he himself suggested the use of a Castrol 20W40), the paranoid in me refused to buy everything the SVCs suggest. I'll surely switch to 20W50 as soon as possible. Thanks for replying

Relax you are fine. No issues as yet.
Ask the svc people if they can allow you to bring your own oil. And if they do then buy a motul , elf, veedol or shell 20w50 mineral oil, semi synthetic you can use after 5000 km
Your engine is new, and in runn in
Changethe engine oil to a 20w50 oil every 1000km and change the oil filter too. After 5000 km use 20w50 oil as long as it lasts (2000 to 2500 km)
The 125 st engine is a little heat sensitive I.e once the engine gets very hot it sounds very harsh even though its fine I guess.
Best 20w50 oil I used till date is motul 3100 gold 20w50
And motul 15w50 can also be used.
divyansh....

Thanks for answering in so much detail!
I am not sure if the SVC will allow me to bring my choice or not (looks like they're big Castrol fanboys. I can at least force them to use a Castrol 20W50 in the name of company's recommendation) but I'll try my best to pour mineral 20W50 oil. The Castrol Activ 20W40 and 20W50 come with 'Synthetic Technology'. That means they're semi synthetic, right?
I tried to find Motul 3100 Gold 20W50 on their website but can't. I hope they haven't discontinued it or something. Hope I'll find it in local shops.

One cannot be sure for bajaj models , they will eventually replace this variant with some other kind of variant, but that is the way this company operates, but don't worry satyam you have bought a good bike, just change the oil as the bike's manuals suggests,you have already got fine answers by honda and divyanshp.

Initially I was a bit worried about my choice, but now I think its fine. I had horrible experiences at the SVC. They told me they didn't had the tools or even the Owner Manual (which made me suspicious about whether they even know about a Service Manual or not), but its too late now. I am already in love with her Thanks for replying!

[kusmaker]

Re: Engine Oils

Thank's bro divyanshp, i am sure you will come up with some kind of idea, cooling air cooled engines is always a tough task becuase the engine is solely dependent on the surrounding atmosphere, if the surrounding air is hot the engine soon will heat up like a furnance, and with it the oil inside the engine will also heat up and starts loosing its viscosity, one idea is coming to my mind, i saw it on T.V. long time back,(don't remember the programme), what this guy did he used a small radiator kind of thing, filled it up with dry ice and just bolted this radiator in front of the engine, and when the air flows from the radiator the dry ice will cool down the hot air, hence the air that's hitting the cylinder fins is comparatively cooler, this method is even used by the F1 teams, although you have to regularly top up the radiator with dry ice and that's a hassle, but all of the unorthodox methods brings with them these kinds of hassles.

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Satyam That's the best part of biking, when you fall in love with your bike loving is always giving, untrained personnal lack of prescribed tools this is the common sight in ASC. but don't worry just keep looking around you may find a service centre who is having these special tools and good mechanics.

[vivek7593]

Re: Engine Oils

Thank you so much mere bhai for the heads up!your logic is absolutely correct come to think of it!
I dot want to damage my beloved... hmmmm now have to think of a way to throw cold air on the engine.... hmmmm.....:P khurafati sochna hoga kuch
And damm you know a lot about truck racing!


divyansh....

I used to keep a table fan in front of my splendour when I was in 7th to cool the engine :P lol

Sent from my LT28h using xBhp Connect mobile app

[Divyanshp150]

Re: Engine Oils

I used to keep a table fan in front of my splendour when I was in 7th to cool the engine :P lol

Sent from my LT28h using xBhp Connect mobile app

Hmmmm on highways when you have air moving around the air cooled engine its enough to cool it
But how to cool it in cities when the bumbper to bumper traffic dosent let you move enough air around the engine ???
Table fan it is!!!!
Awsome idea.
I will buy a few cpu fans that are dc and low voltage and power consumers
Will nake a light weight frame and place them around the engine....
When we are running fast they can be off and can just spinn with the wind + air movement and cool the engine...
But when im stuck in bumper to bumper trafic
Il flip a switch and all of them will come on and blow air on the engine!!!!
Or il just make a frame and put a radiator fan from something and blow air on the engine! Minus the radiator
Now if this doesn't work il think of something else! And keep thinking till I make something that does!

divyansh....

[vivek7593]

Re: Engine Oils

Hmmmm on highways when you have air moving around the air cooled engine its enough to cool it
But how to cool it in cities when the bumbper to bumper traffic dosent let you move enough air around the engine ???
Table fan it is!!!!
Awsome idea.
I will buy a few cpu fans that are dc and low voltage and power consumers
Will nake a light weight frame and place them around the engine....
When we are running fast they can be off and can just spinn with the wind + air movement and cool the engine...
But when im stuck in bumper to bumper trafic
Il flip a switch and all of them will come on and blow air on the engine!!!!
Or il just make a frame and put a radiator fan from something and blow air on the engine! Minus the radiator
Now if this doesn't work il think of something else! And keep thinking till I make something that does!

divyansh....

Thats not a bad idea :P
Well I used table fan when the bike was parked at home
Well in bumper to bumper traffic youll only blow hot air from surrounding
Never tried such thing... Share your experience after you do it
And btw all cpu fans 12v dc ones..

Sent from my LT28h using xBhp Connect mobile app

[Divyanshp150]

Re: Engine Oils

Thats not a bad idea :P
Well I used table fan when the bike was parked at home
Well in bumper to bumper traffic youll only blow hot air from surrounding
Never tried such thing... Share your experience after you do it
And btw all cpu fans 12v dc ones..

Sent from my LT28h using xBhp Connect mobile app

Hmmmmm,:P:P:P:P even if air from surrounding is hot it wont be 100'c like the engine hence it wil still cool the engine quite a bit...
Lemi think something toofani
divyansh....