take some time to read this.. very good read.. https://www.s2ki.com/s2000/topic/875...30-weight-oil/

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I use Shell Rotella T6 also, just took a sample for blackstone labs, will post my results when I get them.

 

i ran rotella in my sti and loved it. I always send a sample to blackstone no matter what oil i run. Currently using castrol german blend 0w30 and its doing great.

 

Pennzoil 10w30 platinum or ultra

 

Amsoil 10w30

 

was using castrol edge titanium until i found german castrol 0w30

 

My favorit has always been Royal Purple. I have been running it since 02-03 back when you had to special order it from their at the time rinky dink website.

I have never tryed Amsoil, but I am going with their transmission fluid for "project hord". Thinking about it earlier today, I figured if Im trying their trans fluid, I ought to give their motor oil a shot.

If I find Amsoil is not my bag of chips, then I'll just switch back to RP.

 

ive always just used castrol gtx 10w30 without any issues, but i usually change my oil like every 2000 miles

 

Royal purple sucks. It is a little better than using urine.

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I've been using 15w40 rotella lately. Its a little thicker than is recommended, but i'm in the south so it doesn't really get that cold here. My brothers engine builder swears by it for there big power race motors so thats good enough for me.