Difference between bike and car engine oil?

[Benbay001]

Id like to service my Dullville.
The bike needs 10w-40, of which i have loads of good quality fully synthetic sat in my garage from my old MR2.
Is this any good?

Thank you.

[Benbay001]

3DP said:

Given the cost difference is nil, why would you want to put car oil in a bike?

Because i have £50 worth of car oil of the same viscosity sat doing nothing. Seems like a waste to buy more just for a 9000rpm engine.
But if as people say there are adatives that can effect the clutch and gearbox then i will buy some bike specific oil.

[Benbay001]

J B L said:

I assume the Deauville's not used on track

right

J B L said:

and rarely sees its red line?

wrong