Quote:
Originally Posted by Robbert
Fact...
I used cheap 15W40 mineral car oil on my transalp for years without problems.
I used 5W40 synthetic car oil of the same brand one day, and soon my clutch would slip when accelerating in 5th gear.
There was still sufficient friction material on the clutch plates.
I guess some of the synth car oils are no good for your clutch. I guess they'll still get you accros Africa. Maybe with a slipping clutch.
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Fortunately for me my Enfield clutch runs in its own oil. The engine in its own oil and likewise the gearbox. Allowing best choice for each application. There are many documented accounts of BMW engines and gearboxes leaking oil through the seals when the owner switched to Synth. The naysayers will probably claim this to be unsubstantiated rumor put about by people with leaking seals or slipping clutches.
The slippery synth oils are sometimes marked with 'energy conserving' or some such, but not always.
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