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Which Engine Oil should I use ?

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Greg H:
Nice one Phil  ;).

Greebo:
It does not state whether this oil is for cars or bikes which is unusual, but I don't suppose it matters, in the 60's a mate of mine put cooking oil in his bike, he use to nick it from work.. ::)

K2-K6:
I'm surprised you've not had an avalanche of stuff on this as oil threads usually generate their own gravitational pull ;)

As you're possibly in a different level of operation with a modified engine I think it's worth more in depth consideration. I'd look at oils specified to VW 505.01 to consider it's specific attributes that could be appropriate here. That point zero one makes a significant difference to the oil spec in terms of material protection.
It's for their series of pump direct engines labelled PD and offers a higher level of protection for their cams which are highly loaded as well as being passed through a literally red hot turbo.

kew:
You need to be a bit careful if you are going to run an engine with more power than standard.
Modern engine oils have friction modifiers to enable the vehicles to have better fuel consumption. If you use these oils you can have problems with clutch slip. If you run a standard engine and you drive sensibly you probably wont have any trouble.
I race a sidecar with an 836cc engine and I'm building a 1000cc engine for next season, I use Millars 20w50 motorcycle oil. The engine oils specified for motorcycles don't have friction modifiers so eliminate the clutch slip problem.

totty:
The oil thread gravitational pull is starting.....

There is a standard for oil for wet clutches so clutch slip is easily avoided http://www.oilspecifications.org/articles/JASO_MA_JASO_MB.php

Gearboxes should also have EP additives to reduce wear, but you rarely see that bit debated, it's always about the clutch because that's where you can feel the difference.

Personally for road bikes I just buy any known brand bike specific oil, yes the prices are a rip off, but it saves having to understand all the oil threads. (for trials where the clutch feel is more important I use Motul 300v)

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