For what it's worth I use a high grade oil in my GSXR due to the high revs the engine can attain, I use bog standard Motul 5000 in the XT as it doesn't rev as high, however, been a large capacity single cylinder still means there's alot of stress on the engine, just in a different manor, so i certainly wouldnt recommend dropping any old crap in. Have a look at this page for instance .... http://www.tpub.com/engine3/en3-46.htm

Yes, you're right. It's not only the shear stress of the gearbox itself the oil must cope with, but all the rolling element bearings throughout the engine and gearbox. Unlike cars, which almost universally use plain bearings.

Er well two quick replies to this one as follows:

1. I use the term MUST not about what he can or cannot do. I use it to explain what is essential for the engine IN MY OPINION.

2. You are always welcome to agree or disagree. That is the whole point of debate and free speech. I think??

3. As I worked for a car manufacturer for 10 years I do know that there are several fundamental differences between car and motorcycle engines. And the oil requirements are therefore very different.

So pleae feel free to use old truck oil in your engine, this is a free society (ish)!!!

What Oil ?
 

I take a guess that might be his point 'that old truck oil would work and chip pan fat too.
You really have to question if all these different grades of oils and reputations are actually credible.
I bought some oil for the car the other day and was overwhelmed by the choice. Slightly worried though I bought the cheapest stuff.

Whilst there are differences in motorcycle engines and those of cars the oils are broadly the same.

Demonstrated by having the same specification and grading systems.

The shear forces in gearboxes exist but the m/c oils are not rated as EP. If they are, the data sheets consistently fail to mention it.

Interestingly, a number of cars I've owned specify standard engine oil as gearbox lubricant.

The issue of additives affecting clutch operstion I can only say I have never experienced it having used standard car oil in many different wet clutch m/c engines for over 25 years.

Either way, it's down to the individual.

My advice would be to make sure the oil meets the specified API rating and is changed regularly (and filters).

Yes fair point Simon. I would only add that the Japanese motorcycle manufacturers have their own standard for oils called JASO, see here http://www.top1oil.com/new-jaso-4t-m...-standard.html.

What is the JASO spec required by the XTs?

Sent from my HTC One using Tapatalk

Use JASO MA spec.

First Engine Oil & Engine Oil Filter Change
 

Bump ! :039:

I will be doing my first Engine Oil & Engine Oil Filter change soon,I have just been on the phone to those great guys at Opie Oils - Redruth [very local to me], on their recommendation,I will be refilling my Tenere engine with Silkolene/Fuchs Super 4 10W-40 Oil which has these approvals :- API SF, SG & SH JASO MA2 .

This is absolutely perfect for the generic XT/X,R&Z engine. I will also be using & fitting a new genuine Yamaha Oil Filter,along with a genuine new rubber O-Ring seal that goes into the inside mating face of the Oil Filter Cover and new sealing washers for the Crankcase & Frame/Oil Tank Drain Plugs too. I don't take chances when it comes to Engine Oil changes,along with all matters concerning Brakes,it's one of thee most important servicing & maintenance jobs that needs doing,so I do it exactly as specifically required & totally by the numbers. I just don't take chances here,I recommend that others do the same,in my humble opinion. If you use what's specifically required & recommended,whether it be consumable materials,parts & torque settings,you should be there or thereabouts to a happy Motorcycle,I reckon.

Cheers - Stim :039:

Shameless bump! :040:

Due to my subpar english I am a bit confused, I read this in the xt-manual:

So this means the 10W-40W Lucas Oil with API SG/SF/CC/CD is not recommended since its got the grade CD..? :018: