Synthetic Oil on Clutches

Would synthetic oil cause my clutch to slip excesively? A salesman at my local Honda shop recommended the HP4 Hi Performance oil with no moly. Neither one of us noticed it was synthetic. And it wasn't until after my clutches slipped that I recognized the bottle. I never ran synthetic in my 2-stroke, but was always warned it could cause problems with a clutch. If it can cause a problem, what kind of bike would it be used in? Bring on the comments. Thanks


Synthetic oil can cause problems in wet clutches. True syn. oils contain PTFE (plastic) when enough gets inbedded in your clutch, it slips. Not all syn. oil cause this problem. Some synthetic oils are not truly synthetic. Mobil recently sued Castrol for this. I always call a tech. rep. before trying a new oil in my bike.

Best of luck,


I run Mobil 1 15w50 in my bike with out any trouble!! I don't think that the HP oil that you were using is your trouble!!

once a clutch start slipping even if its by you it gets VERY hot and if it stays hot it will "glaze" or cook the clutch and it will not work correctly again

I second the 15W-50 Mobil 1 suggestion. This question always comes up in the other discussion groups and I have always recommended Golden Spectro 20W-50 semi-synthetic when asked. Since I have seen a lot of good things about the Mobil 1 in these discussions, I thought I'd finally give it a try this evening. On my test ride, it performed flawlessly, with no clutch slippage and I like the fact that it goes in a little thinner (faster) than the 20W-50. It's also cheaper ($4 vs $7 a quart) and I can get it at Wal-Mart. Be sure to use only the 15W-50 Mobil 1 because other weights have friction modifiers and will cause clutch problems.

I've used SILKOLENE 10W40 SYNTHETIC in all my XR's and have never had any problems.

What I do have a problem with is the $8 a quart price tag!

I do like that it is RED (like tranny fluid) so you can see when it starts getting dirty.

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