Semi synthetic oil

[SUPRASUZUKI]

I've got hold of 25 litres of Silkolene 10w/40 semim synthetic oil for a very reasonable price.

 

I bought it for the bike, but just out of interest, what is the difference between 10/40 oil for motorcycles and 10/40 for cars??

 

Anyone? oilman??

[garethr]

It's my understanding that motorcycle oils have different additives because many bikes use the same oil for engine, gearbox, and primary drive/clutch.

[Thorin]

And you want fully synthetic for the Supra.

[SUPRASUZUKI]

The shared oil principle sounds fair for bike oil.

 

Do you really need fully synthetic for the Supra for normal road driving?

 

I know there's lots of info on here to that effect, but I wonder whether there's any conclusive evidence that it's needed.

[Digsy]

There's nothing at all that stipulates that you must have fully synthetic oil in a stock Supra, driven normally. The car will almost certainly not have been developed to require fully synthetic oil.

 

If you are modded or go racing a lot, I would use it, though.

[SUPRASUZUKI]

Thanks, that's what I thought.

 

On the question of bike oils, it sounds logical that a bike oil (even with additives for gearbox/clutch protection(?)) which serves the engine to 13,000rpm should be safe in a car engine to 6,500rpm.

 

I'm not intending to use it, just exploring the principles that's all.

[Digsy]

On the question of bike oils, it sounds logical that a bike oil (even with additives for gearbox/clutch protection(?)) which serves the engine to 13,000rpm should be safe in a car engine to 6,500rpm.

 

Not sure. I'm no virtuoso on bike engines, but the ones I have seen inside seemed to have proportions similar to a car engine, only smaller. It may be that their smaller (and lighter) components mean that the specific loading on the oil is close to that in a car at much lower RPMs.

[Tricky-Ricky]

I have used Shell semi synthetic in all my cars, in my 335bhp S14 and now in my modded Supra, and never had any problems.