Yamalube or Belray thumper for YZ450 08?

Ok i know that these oil threads have been discussed till death...but it's a simple question. Is Belray Thumper a better oil for YZ450 08 or i should stick to Yamalube?

Yamalube is crap, I like Amsoil.

I run yamalube and am very happy with it. We have quite a few guys that come in who dont ride yamahas and still use their oil. I've heard people go back and forth "(insert brand of oil) is crap, I'd never run it". Guess its all personal preference.

Yamalube has had a demonstrable inability to retain its viscosity under shear conditions such as commonly found in MC transmissions. It does not stay in grade very well at all as of the most recent tests I know of.

Were do I get amsoil? I been wanting to try it, but no local shops have it.

Yamalube has had a demonstrable inability to retain its viscosity under shear conditions such as commonly found in MC transmissions. It does not stay in grade very well at all as of the most recent tests I know of.

is that across the board? or does their full syn do fine?

Yamalube has had a demonstrable inability to retain its viscosity under shear conditions such as commonly found in MC transmissions. It does not stay in grade very well at all as of the most recent tests I know of.

Yeah i read that comment again in another thread written by you and that's why i'm looking for another oil to use. I heard a lot for Amsoil but in Europe it is impossible to find it. I have to choose among Belray,Motorex,Motul,Repsol and Yamalube.

Motorex and Motul have addressed this issue. I believe Bel Ray has as well, but I'm not totally certain.

Amsoil can be purchased directly from http://www.amsoil.com/

yamalube only has semi-syn. And dino oil of course.

Yeah i read that comment again in another thread written by you and that's why i'm looking for another oil to use. I heard a lot for Amsoil but in Europe it is impossible to find it. I have to choose among Belray,Motorex,Motul,Repsol and Yamalube.

The best oil, is clean oil. Of your above choices, I would use Motorex.

Motorex and Motul have addressed this issue. I believe Bel Ray has as well, but I'm not totally certain.

Amsoil can be purchased directly from http://www.amsoil.com/

Thanks for the link, I picked some Amsoil up on there today.:thumbsup: Moyul 300VT is up to $17.95 in the shops!:lol:

ive been running belray thumper oil and after 3-4 hours it still comes out in decent shape, motul 300v is the best in my opion if you can afford it 24.99 a liter here :thumbsup: gonna try lucas oil next

rotella

rotella
...is a better lubricant than Yamalube, but it has the same problem with staying in grade.

Rotella for three rides, then change. $11.00 a gallon at Walmart. Many oil analysis have shown that all oils have suffered from shear stability. Change your oil often and you don't have to worry about it. I refuse to pay $10.00 a quart.

I took a tour at Pro Circut and they let us know that you should change it every 8 hours.

Did not matter what oil as long as you change it.

Rotella for three rides, then change. ... Many oil analysis have shown that all oils have suffered from shear stability.
Lab tests and my own analyses show otherwise. Rotella and others of its ilk should be changed after no more than 3 hours. After that time, you are running a 15w-30 to 15W-25 oil, not a 15w-40. Leave it longer if that works for you. It will still be a pretty high quality 30wt.

I have had samples of Amsoil MCF, Mobil 1 Racing 4T, and Golden Spectro 4 go beyond 8 hours and still be at or above SAE 40 at 200 ℉. ASTM D-6278 lab tests have born this out as well.

It's really very simple. Multi-grade gear oils don't have this problem to a significant extent because the additives that make an oil a multi-grade are selected for, and tough enough for, that task. Oils blended primarily for engine use don't use the same additives, and quite often fall short in that regard. The better contemporary motorcycle oils have been blending their product with these tougher additives in recent years, so it does make a difference. As time goes on, the list of those oils that are capable of holding up well grows longer, but none of them are sold in gallon jugs at Wally World.

Footnote: I have no recent samplings of Mobil 1 Truck & SUV, Extended Performance, or High Mileage oils, all of which are sold at a discount (although still more expensive than Rotella). Those looking for a break might want to run a test of their own on one of these. Truck & SUV or EP would be the most likely to pass, IMO.

I use Shell Rotella T full synthetic in everything,,,,,great oil,inexpensive and available at your local wally world.

Just wondering, has anyone tried the Klotz MX4 ?

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