queso

RP for me too. Mobil 1 is too thin.

Patman

You do realize that RP thins out to a point where it's even thinner than M1 though don't you? At least their 5w30 and 10w30 do. If you run RP, go with their 10w40 or racing 41.

BigPlanTransAm

so what weight would be a middle of the road oil that would see freezing temps in the winter and hard racing during the summer? should i mix 2 different weights or what?

and btw this is a very informative discussion so lets keep the replies coming

Patman

A good oil to use all year round would be Amsoil 5w30, Redline 5w30, or the new German made Castrol Syntec 0w30. All three of these oils are very thick 30wt oils, almost being 40wt, but all three of these oils also have excellent cold weather abilities and could handle the coldest temperatures you'll ever see (especially the German 0w30 which has a pour point of -81F!).

BLUEBYU

iTrader: (1)

I have had good success w/ 5 qts. of M1 0/40 and 1 qt. of Lucas "Oil Stabilizer".... How does this compare w/ just running M1 15/50?

BLUEBYU

iTrader: (1)

ttt

Patman

I wouldn't add that oil stabilizer to any oil. Just run 100% 0w40, it'll work fine on it's own and needs no help. That Lucas stuff just thickens your oil.

bryan c

where can you get M1 0w40? i've never seen it anywhere around where i live (baton rouge, la).

ddmcamaro

what about mobil 1 5w30? the vettes come stock with that don't they?

Rescue Ranger

iTrader: (10)

I want to renew this thread since a ton of questions I've had on oil and oil analysis were answered in this thread. Patman's knowledge is very helpful for this topic.

Kman

I am not sure what oil I should run in my 2001 Z28. Some say the Mobil 1 5w-30, others say that is to thin. Would Mobil 1 5w-40 be good? I'm in Southern California so it's pretty warm. High today so far is 89 degrees.

I made a thread asking about oil here...

https://ls1tech.com/forums/general-maintenance-repairs/387534-what-oil-use.html

o2man98

I like a 5w-40 T&SUV for the LS based engines or either the GC or Amsoil 0w-30. The Amsoil 5w-40 seems to be getting very popular and is great quality.

1LoudTA

iTrader: (11)

im runnin the M1 5w-40 Truck&SUV and my engine is noisier, and i think im getting piston slap now, idk if thats because of the oil but i dont think its coincidence. only has 27k .

TightSS

I don't know crap, but it sounds like Patman does. I'll be takin' his advice.