As title really: which viscosity/type/brand of oil do you recommend for an STI 5. Only got simple mods (remap, exhaust, STI8 intercooler, 3-port) and generally is driven for fun and thus fairly hard when warmed up.

 

10/40 fully synthetic like motul v300

 

I use millers 10/60 fully synthethic

Banny

 

Here we go again!
Well, may aswell add to the confusion. I use Mobil 1 15w50 and have used used this in an sti4, sti3 and a uk turbo.

 

Millers is the way forward. quality oils

 

I first used Motul 300v 10w40, now with the warmer weather, Silkolene Pro S 10w50. Both do their job fine. Motul smells like popcorn, but the Silkolene is a cool purple colour LOL

 

Agree silkolene pro s 10/50!!

 

gets my vote to

 

I use in my STI, in summer Castrol Formula RS 10w60 and in winter Castrol Formula RS 0w40