Re: Yamaha FZ 25 Owners Reviews and Experiences

Simple thing is if the company recommended oil is mineral or semi synthetic , don't use full synthetic.
It is not bro science.
Mineral oil is used and recommended where the clutch plates are asbestos and with fs oil it would start to slip in the long run. Companies making motorcycles have done their homr work and thus use and recommend what is best.

Oil can be used from any make but the grade and type should be same.Sahi bole Ankit bhai.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Synthetic oil in a new engine... i think, its bad.

BTW, Motul, Mobil, yamaha and all these are companies, which work for profit. This is their main Motto and they don't want to go wrong with this.
Rest all is a joke. Their products, service and etc. All are done just to meet their primary objective. i.e. to make money.

VW still has better engineers in every department than Motul. It also has many times more engineers than what Motul & mobil combined have. What happened? They cheated almost all countries and all norms to the max possible value. Just because, to meet their primary Motto or objective.

People on our Forum recommend based on their experience with the product and what they feel about it. They don't expect anything in return.
Now, you chose whom to trust and whom not to.

Re: Yamaha FZ 25 Owners Reviews and Experiences

You are taking this personal bro i didnt meant to target you. (sorry ankit) ,our views were just different.
yes i dont have chemical engg degree but i do have mechanical engg degree & currently i am development manager of a automobile company(not motorcycle), i developed quite a few engine & suspension parts so i think i am eligible to speak what i understand.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Its ok bhai, I respect your opinion.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Yes mineral oil & semi synthetic are better for new engines.
but fully synthetic is better after break-in period.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Thats same thing I was trying to say.[emoji14]

Re: Yamaha FZ 25 Owners Reviews and Experiences

Hello Ankit,

Thank you for your input. Yes it does tends to heat up in B2B traffic and heat up pretty badly. But then again it is ideal for touring purpose. However I don't understand how it is ineffective for new FZ25 engine but otherwise effective for old FZ25 engine.

I have decided to switch to stock engine oil (Yamalube) with drain interval keeping it as 2500kms. Since the oil tends to loose its characteristics post 1500-2000 kms depending on riding conditions.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Its not specific to fz25 but all single cylinder air cooled engines. "Chances" are more with fz25 being high heat producing engine in minimum air flow conditions (b2b) to block&head.

In new air cooled engines, due to heat metal and internal oil seals expands and contracts more compared to old engines, "very high quality" FS oil in simple terms are too slippery compared to mineral and SS oil which tends to seep through areas in engine where it is not required in expansion and contraction process.

Due to too much slippery oil cylinder and piston can not make proper seal together (run in process) which returns in future vibes and increased oil consumption due to high slippery oil seeping in cumbustion chamber. Internal oil seals also get deform due to continous seepage of very slippery oil and then ultimately give up. Whereas in settled engine upto few thousand kms heat generation is less and metal grinding also finished so very very less chance of FS oil seepage.

Multi cylinder and high performance engines are designed in such a way and internal metal to metal clearances are set to handle high quality oils by default.

Re: Yamaha FZ 25 Owners Reviews and Experiences

I do get your point. My bike is close to 3000kms now. That is done with run in period. But the fun point is I was told by SC that they have used FS Yamalube during the oil change and that is what is recommended as per them. Now considering if they are not lying there is no harm with Motul. But then the issue I faced is engine does heat up during B2B trafiic and there isn't much improvement in gear shift while downshifting from 5th to 1st in low speeds like below 35kmph. SO I am little confused. I will do a oil change this time in front of me to check what oil do they use. Will put of my experience accordingly.

Re: Yamaha FZ 25 Owners Reviews and Experiences

yes bro

Re: Yamaha FZ 25 Owners Reviews and Experiences

Dont worry, by the time engine will get settled. Mine is 6100 odo and no heat issues even in traffic. After 4.5k odo i felt engine settled correctly.

Yamalube oil marketed as FS oil is 375 Rs per litre whereas a high quality FS oil sold not less than 750 Rs per litre so decide yourself. Yamaluble oil quality for fz25 is like SS oil only.

If you have doubt then change oil in front of you. No harm in spending 375 bucks if its give you mental peace.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Always see that they are actually changing the engine oil ,one of my friend was working in honda service center according to him

1.90% of cases they dont change engine oil.
2.if you left your bike with more than half tank petrol they will at least draw 1 liter.
3.they never install new spark plugs or air filter.
4.they issue new engine oils,spark plug& air filters etc from store but it never reaches your bike the supervisors sell
those items to some small parts shop,manager gets petrol for his car.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Lack of Gear smoothness can also because cluth issues. Since the oil change is very recent, ask the service center to check if the cluth is fine.

Re: Yamaha FZ 25 Owners Reviews and Experiences

Any Internal combustion engine, has one free moving part, which is Piston in a Cylinder/s.
All the power generated by piston is being transferred to wheels/Wings/Drives is done through sprockets/shafts with Teeth.

Moving an object in air is easy, because, less resistance provided by wind. However moving the same object in water is difficult because of more resistance from water. If you try to move the same object in maple syrup, it would be more tough, because of more resistance from syrup, which is thicker than water.

All engine components are submerged in Oil.
In a new engine, the internal sprockets/shafts teeth would be sharp and during run in they just taper off the sharp edges and start to move freely without any resistance from linked sprockets. All the waste material from these wear outs gets caught in oil filter and later flushed out in Engine oil.

The tapering off of edges happens in submerged components and the wear is very limited, because of resistance provided by engine oil.

Now, coming to FS part.
Fully synthetic oil is more free flowing. I.e. Resistance in FS oil is less, hence more free flowing.
When you use a FS oil in a new engine, the oil with its free flowing nature doesn't provide enough resistance to the moving sprockets/shafts. Hence they will move more faster than actually needed. It Causes engine to heat up more than limit and more tapering off of the edges. At this excessive heat, the parts discussed in next para will take more hit.
Remember, if shafts/sprockets with more tapered off edges = more damaged engine.

Second being, the additives in FS oil. As others pointed out, to maintain such properties of FS oil, there are more additives in it. All internal seals of engine, having other than metal joints/bushes will take a beating from these additives. when you use regular oil, and when these parts get exposed to more heat, they bead in. Yes, they bead in with heat. Also, regular oil doesn't go into its internals because of its thicker nature, so the bead in happens properly.

FS being more free flowing, has a tendency to get under these plastic/ rubber items and could cause them to not bead in properly. also, these parts could expand more than whats actually needed because, engine moves more freely than whats needed and causes more heat.

Expensive modern engines can take FS/Mineral oil at any point of time, because few of these engines come with factory run in. That's the reason why those manufacturers recommend only FS oil to Customer, because, mineral oil is not needed as break-in is done at factory and they want to deliver more performance to customer.
How people understand it? Mclaren/Merc recommends only FS oil, so FS oil is good for my bike too.
But we fail to understand the concept that our vehicles are mass produced. each vehicle doesn't even take a min to manufacture. The break in process is in our hands and it needs to be done properly.

Few people who have put in FS oil in brand new bikes, but who drive responsibly might not face any adverse side effects. but it varies from vehicle brand to brand and FS oil brand too. Why take a chance? Stick to Mineral oil for at least 10K kms. This is what people recommend and good advice in financial terms and in reliability terms.

Re: Yamaha FZ 25 Owners Reviews and Experiences



This is the recommended specs of engine oil and nowhere is the type of oil mentioned. So how would we know what's best. So every dealer would have different recommendation as my 'authorized Yamaha dealer' recommended mineral oil for 5000 kms.lol

Also I did check clutch for the recommended free play. It's within the required range. But still gearbox sometimes sounds horrible.
And with the recent oil change to mineral oil I got the tappet sound too when bike is heated.