I was wondering if 5W 30 would be any good for our engines?
Standardish V5 STI Type-R

 

For your version, only general poodling about in the depths of winter!
5w/40 is the minimum you should consider and preferably 10w/40 or 10w/50
JohnD

 

Not recommended at all, the manual states for extreme cold conditions and not to over rev the engine, ill let you make of that what you will, a 5w40 fully synth (depending on mileage and if the car is running/has been running fully synth otherwise a 10/40 semi synth)

Tony

 

Ill stick with 10 40 semi then

Only wondered as i got sum 5 30 fully S from work for free lol

 

Not the best of choices for a classic STi.

Newage, maybe if was a totally stock daily driver, but not a classic Sti.

 

Also it is no use in side valve lawnmowers.