I've been using Mobil 1 Synthetic 5w-30 in my '01 Z28 for three years now. I've been wondering if I should change to a different weight, 5w-30 seems a little thin considering I live in IL and only drive it during the spring, fall, and summer when there's no snow on the ground. In the winter I drive my POS beater, a Plymouth Reliant with over 300K miles on it(It just won't die, it's indestructible!).

 

Do a search.. there are hundreds of posts on the subject...

Patman is the resident oil expert.. most of the posts you find will have great info provided by him.

 

i switched to 10w-30synthetic(was using 5w-30 dino oil) about two years ago and have had no problems.in fact,my oil consumption dropped quite a bit.

 

redline 5w30

 

I use Redline 10w30 cause, well, it's the best. Nothing wrong with Mobil one at all. (I'd use 10w30 for sure though)

 

The GM LS1 crate motor installation guide specifies 10W-30 synthetic oil. Kinda interesting what the General likes when CAFE standards aren't involved.

Patman seems to like the German-made variant of Castrol Syntec 0W-30, and so do I now that I'm using it. My '02 Silverado is quieter than it was with Amsoil 5W-30, and the LS1 I just finished swapping into my '82 Z28 is nice 'n quiet also. When I hit the road course this season, I'll be running Mobil Delvac-1 5W-40.

 

ROYAL PURPLE IS THE ONLY OIL I HAD IN MY CAR AND I MADE OVER 440HP ON A MILD TUNE, STAGE 2 MTI HEADS AND AN X1..MY CAR (if the truck driver didn't think it was a parking spot) would still be making this HP @ over 110,000 miles.

 

Go the 10-30. Mobil is good. AMSOIL is best. But go with the 10-30.

 

Amsoil didnt measure up to RP....10-30 is a safe all weather oil...here in Htown...10/40 is a must in the summer....

 

My top recommendations are German Castrol 0w30, Redline 5w30 or Amsoil 0w30 or 5w30.

 

Patman dont you get tired of answering the same question

Do you have a automatic saying everytime you see a oil post, they are always the same

i havent been able to find the German castrol so I run the Redline 5w30

 

anyone here uses schaeffer's 7000 blend 10w30?

 

I was using that in my LT1 last year actually, and also tried their 5w30. I got good results, but have gotten better results since switching to the 0w30 Castrol.

I have seen an LS1 oil analysis running Schaeffer 10w30 though and it looked incredibly good, it had very low engine wear.