which weight

I use Amsoil MCF. Other top level performers are Mobil1 Racing 4T, Maxima Ultra, Golden Spectro 4, Motul 300, and others. I don't recommend Rotella (even though it's very popular here) because it doesn't have the shear stability to be used longer than one ride day without changing.

Amsoil can be bought at a local brick-and-mortar dealer for the same kind of high prices the other oil above sell for, or ordered as a preferred customer for a net cost of just under $8/qt, delivered.

When the moving parts of healthy engine are properly worn in with each other, they will almost run with no oil because they're so well matched to each other. It takes very little lubrication to keep them out of trouble. This is not true of a brand new engine. In that case, the engine needs the best lubrication it can have, so why would you deliberately use less? I use the same Amsoil synthetic to break in my new engines as I run the rest of the time (I actually drain the factory oil on a new bike before the first ride). I have not ever had an engine fail to seat the rings, or have any other short or long term problem as a result.

The list of high end performance cars that come factory filled with synthetic oil and require their use from day one is a long one, too.

More:

http://www.thumpertalk.com/forum/showthread.php?p=2685432#post2685432

http://www.amsoil.com/lit/g2156.pdf

Now you got me thinking I use Rotella T in all my bikes but I do change it after every 3 rides. I have the option to get the synthetic Rotella T blue jug at Wal Mart. Do you think this has better shear properties and would be better for changing it after 3 rides instead of the white jug?

Gray, Have you heard or read anything concerning Torco T-4 or Torco MX-t??? I know we just got a few barrels of this stuff at the shop in 10-40 to go along with the 20-50 Spectro we have been using.

Not precisely, but Torco T 4SR did very well in the Amsoil test, including a very good result in the D-6278 shear test (viscosity retention). I'd say they know how to make a suitable oil for the YZF. Run some and have it tested.
I have the option to get the synthetic Rotella T blue jug at Wal Mart. Do you think this has better shear properties and would be better for changing it after 3 rides instead of the white jug?
No. I have seen used oil tests that suggest that the 5w-30 synthetic has even less shear stability than the 15w-40 dino oil.

I've used Torco T-4MXR 15w-40 in my YZ250f for over a year and it has done very well in used oil analysis even at 3.5-4hrs it's still in grade. I'm using it in my 450 also. I've never tried the T-4 as I always use a semi or full synthetic. The tests I've seen on the maxima extra 15w-50 have also been very good. The oils grayracer mentioned are also very high quality.

I use and one of the best oils on the market Mobil 1 MX4T 10W40 4 Stroke Motor Oil.

I use and one of the best oils on the market Mobil 1 MX4T 10W40 4 Stroke Motor Oil.
It's a great oil, but it's not called that anymore. It's Mobil 1 Racing 4T now.
It's a great oil, but it's not called that anymore. It's Mobil 1 Racing 4T now.

Would this be better than Bel-Ray Thumper oil?

can someone give me a quick answer? what is a good oil that i could get at wal-mart for my 99 yz 400. weight and brand. i ride in average California temps. thanks

I've used Torco T-4MXR 15w-40 in my YZ250f for over a year and it has done very well in used oil analysis even at 3.5-4hrs it's still in grade. I'm using it in my 450 also. I've never tried the T-4 as I always use a semi or full synthetic. The tests I've seen on the maxima extra 15w-50 have also been very good. The oils grayracer mentioned are also very high quality.

Thanks for the info Rick! I race with one of the Torco reps. and Just got him signed on at our shop for our service oil. We have been using the Spectro 4 for years but now we are using both the spectro and Torco.

any issues with Castrol 10-40?

Which Castrol, specifically?

"can someone give me a quick answer? what is a good oil that i could get at wal-mart for my 99 yz 400. weight and brand. i ride in average California temps. thanks"

I second this question...

IMO, the answer is , "no". There are good automotive oils available from Wal-Mart, but usually not any good motorcycle oils capable of serving the dual role of engine and transmission lubricant for any length of time.

Sometimes a local WM will stock Mobil 1 Racing 4T (formerly MX4T), in which case, there is an excellent oil available, but most times not.

Rotella is OK if you change it after each ride. Mobil 1 Extended Performance is a little tougher, but not much. They just weren't made for that.

where can i get that oil you suggest? and in 10-40? thanks

I use Amsoil MCF. You can get that at any Amsoil dealer, or directly from Amsoil.

Mobil 1 Racing 4T is often available from auto parts stores.

greyracer,

can i use castrol GTX in both 2 and 4 stroker's? 10-40

GTX is a low cost automotive engine oil right? I wouldn't use it in either. It's not a transmission lube.

GTX is a low cost automotive engine oil right? I wouldn't use it in either. It's not a transmission lube.

Didn't i just read a thread about someones motor blowing up and they were using the automotive oil???????? Rotella or something?

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