Synthetic oil

Will it bugger my wet clutch? I've got a litre of 10w-40 Castrol GTX magnatec that I was given. Bike could do with a top up, I don't have loads of time and could do without going to the garage if I can get away with it.

If it's only a top up for a few miles then I wouldn't worry about it. Best to use proper bike oil as a general rule but we've had this discussion time and again, and although you'll doubtless have protestations from the anti fully synthetic zealots (sorry lads ), there are others who've used it and been more than happy.

PM Embee for an accurate answer as he knows all the applicable standards.


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That'll do So long as a top up doesn't spell instant death, I'll risk it. Ta Jonboy.

From what i can tell from the service records my bike has been running a fully synthetic castrol motorbike oil since the 600 mile service. Engine runs ery nicely.

I wouldn't use magnatec, it has a friction reducing component that will cause a worn clutch to slip. I used it on my old gixer and when clutch starting slipping it really let go.
I reckon OK for a top up but I wouldn't fill the crank case with that ever again.

As for the whole oil debate I'm a semi-synth fan

Smiffy, listen to Burner! Magnatec is a great oil, designed for use in vehicles that DON'T have a wet clutch. It has friction modifiers that will definately give you clutch slip. Use a synthetic BIKE oil.

I use Rock-Oil semi, change it every 3000 miles and a filter every 6000. I.ve stck to this regime on all the bikes I've owned, covered countless thousands of miles in my 21 years of riding and found no appreciable wear on engine components due to crap lubrication.

Moral of the tale, I guess, is "Keep it clean!"

Ride safe