Thoughts on M1 5w-50 vs. M1 15w-50

[Jim 5]

Looks like retailers here in canada won't be stocking M1 15w-50 any more. All they're stocking is the 5w-50 variety, which they say is the recommended replacement for the 15w-50.

Anybody have any thoughts about how this 5w-50 will stack up against the old red-cap 15w-50 in a motorcycle application?

 

[KBFXDLI]

Most likely more additives but in a wet clutch application probably will have more modifiers that could cause problems.

 

[Jim 5]

I've been running some castrol syntec 5w-50 for about 200 miles now with no clutch slip issues whatsoever.

 

[Reg# 43897]

Interesting on the Castrol... I have not heard of anybody using it but it sounds like it should work just fine...

 

[automated1]

Seeing the 5-50w spread it might shear down quickly in wet clutch applications. Not really sure but its something to think about.

 

[sunruh]

considering that "red cap" sheared down pretty quickly, i can only imagine at how fast a 5w50 would turn to water.

 

[Blake Sobiloff]

Agreed--stay far away from anything with that large of a viscosity spread.