Engine Oils

[vrm_venkat1]

hi i'm venkat from chennai. I'm also have heat problem in my 2011 model CBZ Xtreme model. In service centre,they were told its common issue with new engine. but i have crossed 5k still i'm facing the heat problem. FYI i'm using HH 10W30 min oil still. Shall i go for higher range engine oil.. or stick with this?.

[girimajiananth]

use the 10w30 mineral oil until all free services are over , once free services are donr u can use 10w40 .

Most of them start using synthetic oils , but IMHO ,you can use semi syntetic till 15-18k kms . so that there will be little wear and tear and the valves , rings will be set properly. i started using shell semi synthetic 10w40 and its really good . far better than HH mineral oil

[girimajiananth]

I understand what you're trying to convey. What you're telling is that a 0W40 oil will be more viscous than a 10W30 at a temperature of 20-25 degree celcius, right? Then what is the significance of number before W, if all that matters according to you is the number after the W? (assume the temperature conditions to be at Delhi or most other places in India where the temperature NEVER goes less than 0 degree celcius).

the number before W is the viscosity index (VI) of oil at 0 degree centigrade.

[muztariq]

I understand what you're trying to convey. What you're telling is that a 0W40 oil will be more viscous than a 10W30 at a temperature of 20-25 degree celcius, right? Then what is the significance of number before W, if all that matters according to you is the number after the W? (assume the temperature conditions to be at Delhi or most other places in India where the temperature NEVER goes less than 0 degree celcius).

SAE Multigrade Oil Properties compare 10W30 and 10W40.

[FranklySpeaking]

the number before W is the viscosity index (VI) of oil at 0 degree centigrade.

It is better to read up a bit rather than saying anything and completely wrong. Viscosity Index is the RATE OF CHANGE OF VISCOSITY just the same way as acceleration is rate of change of speed.

For your info

Viscosity index - Wikipedia, the free encyclopedia

By your logic, viscosity index of a 10W30 oil would be 10, whereas Gulf says that the viscosity index of Gulf Pride 4T 10W30 is 147.

http://www.gulfoilindia.com/images/pds/GulfPride4TPlus.pdf

May be Gulf Oil is wrong and you are right?

SAE Multigrade Oil Properties compare 10W30 and 10W40.

Please show me a post of mine where I said that 20W50 is less viscous than 15W40. You have completely twisted the things.


It is you who has been telling that 15W50 is more viscous than 20W40. Read your own post below.

Again you are misquoting me.
1) Read your file again - It only compares XXw40 grade viscosities.. now read my line "Always remember, when at room temperature.. a 5W40 will have slightly better flow than 10W40 which will have a slightly better flow than 20W40 which will have a much better flow than 10W50 which will have a slightly better flow than 20W50 which will have a much better flow than 10W60 and like wise." arent they in sync?? There is a slight increase in viscosity when you go above 0W40 to 5W40 to 10W40.. that is what I said before you posted the link! 2) Now read your line - In fact, 15W50 will become thicker than a 20W40 at very high temperatures - W50 and 20W40W50 and 20W40!
Anyways, you can seal the remaining oil in the bottle. Nothing will happen. These oils vaporizer at repeated beating at high temperatures and not at RT!

The point that I have been trying to make here is that a 10W30/10W40/10W50 is bound to be less viscous than a 20W40/20W50 oil at normal ambient temperature which you can assume to be 20 degree to 30 degree celcius.

[FranklySpeaking]

I have recently acquired Jawa 250 and manual says recommended engine grade is SAE50 . It seems SAE50 single grade is no more available here.
The mechanic here says to use mixture of SAE40 + Small amount of SAE90 which I am not sure.

Can I use 20W50 oil for the same or mechanic recommended mixture ?

It is better to use 20W50. 20W50 is a better bet than a straight 50 oil.


Mechanics do not know any technicalities and they just recommend anything. Trust the people who make oils. Your motorcycle's manual is quite old, thats why it recommends straight 50 oil. No manufacturer now recommends a straight 50 oil for the obvious benefits that multigrade oils have.

Straight 50 also have one benefit since it wont have any Viscosity Improvers, thus less sludge and other such issues. But if you manage to do a regular oil change, use a 20W50. It also acts like a 50 straight oil at 100 degree celcius (near to operating oil temperature inside the engine). Just that it is better when cold (at like 20-30 degree celcius temperature) when you start the engine. At that time the oil temperature is also same as ambient temperature (20-30 degree celcius). At this temperature, straight 50 oil will be quite thick to reach the nooks and corners properly. That is why they invented 20W50. It will be thinner than a straight 50 at those times when you start your motorcycle.

But, 20W50 will become equally thick as your 50 straight oil at 100 degree celcius temperature.

[girimajiananth]

It is better to read up a bit rather than saying anything and completely wrong. Viscosity Index is the RATE OF CHANGE OF VISCOSITY just the same way as acceleration is rate of change of speed.

For your info

Viscosity index - Wikipedia, the free encyclopedia

By your logic, viscosity index of a 10W30 oil would be 10, whereas Gulf says that the viscosity index of Gulf Pride 4T 10W30 is 147.

http://www.gulfoilindia.com/images/pds/GulfPride4TPlus.pdf

May be Gulf Oil is wrong and you are right?





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Motor oil - Wikipedia, the free encyclopedia

check out this one ! i think i got confused between VI and grade .

[FranklySpeaking]

hi i'm venkat from chennai. I'm also have heat problem in my 2011 model CBZ Xtreme model. In service centre,they were told its common issue with new engine. but i have crossed 5k still i'm facing the heat problem. FYI i'm using HH 10W30 min oil still. Shall i go for higher range engine oil.. or stick with this?.

Thicker oil will only make it run even hotter.

Try your luck by changing to some other manufacturer. I think that Hero Honda Oil is made by Savita Chemicals (Savsol) under license from Idemitsu.

I like this oil from Gulf called Pentatec and it is available in 10W30. Also, it is JASO MA2. Use it and see if it helps.

[FranklySpeaking]

Motor oil - Wikipedia, the free encyclopedia

check out this one ! i think i got confused between VI and grade .

He, he, yes, obviously you were confused. In a 20W50, 20 and 50 both are grades, that is why a 20W50 is known a multigrade oil. Viscosity Index is explained by the webpage the link to which I gave you earlier.

[girimajiananth]

yeah , read it , my bad , i got confused. So whats all the big discussion now ?

[Honda_CBF]

I have recently acquired Jawa 250 and manual says recommended engine grade is SAE50 . It seems SAE50 single grade is no more available here.
The mechanic here says to use mixture of SAE40 + Small amount of SAE90 which I am not sure.

Can I use 20W50 oil for the same or mechanic recommended mixture ?

its a two stroke bike, right? if yes, then you are asking about gear oil. even a straight 50 wont harm anything. and you can always use 20w50 (with little frequent oil changes as stated earlier)

[mulli84]

Mine is a CBR 150R and I have mostly baby rided the bike. I did some hard rev driving only for the past 300kms. Is it good to change the oil to FS in my second service. Or should I change to mineral and set the bike still more?

[vrm_venkat1]

ok surely i will try in my next oil change.. thanks mate for ur suggestion

[amardeep2006]

its a two stroke bike, right? if yes, then you are asking about gear oil. even a straight 50 wont harm anything. and you can always use 20w50 (with little frequent oil changes as stated earlier)

Sorry for the confusion , I am newbie to the 2stroke world .
I discussed this with mechanic today and he explained the logic of mixing two oils and it will be used for gear box only .
Now I am clear that 20W50 being a multi grade oil will behave as SAE20 oil on zero degree temperature and SAE50 on hundred degree temperature. So this will be too thin at the starting of engine and bike will run hotter.

I am some how like the idea of 70% SAE40 + 30% EP 90 oil.

[muztariq]

Please show me a post of mine where I said that 20W50 is less viscous than 15W40. You have completely twisted the things. Yes I agree you didnt said. Just used it as an example. You said 15W50 is less viscous than 20W40 at room temperature. Its the same.. You just meant 15W is less viscous than 20W at room temperature.. Which is wrong. Number after W plays bigger role at room temperature.


It is you who has been telling that 15W50 is more viscous than 20W40. Read your own post below.



The point that I have been trying to make here is that a 10W30/10W40/10W50 is bound to be less viscous than a 20W40/20W50 oil at normal ambient temperature which you can assume to be 20 degree to 30 degree celcius.You didnt said this earlier.. I agree to this statement with the exception - 10w50 may or may not be as viscous to 20w40. Other will definitely have better flow to the latter grades.

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