Frametwista

iTrader: (1)

Motor is stock 6l al ls2 with turbo cam and springs.It has about 8k miles on it about 3k boosted only 6.5lb so should i stick with the mobile 1 5w30 or is there something better suited for the health of my engine? thx in advance

fatmat80

i use valvoline vr1 straight 40 weight for my TSP forged 347 with a d1sc my motor sees about 8lbs of boost..

Frametwista

iTrader: (1)

ok any other input?

XtremeDime

iTrader: (16)

I use rotella 15w40

9sectruck

iTrader: (9)

i run 15 40 mobile in my ls2 13-11psi

Tally TransAm

iTrader: (17)

using M1 10w30. might switch to 15w40

camaroturbo

rotella 15w40 works for me

NXPRSS

iTrader: (23)

i run royal purple 10w-40

TRMIN8R

iTrader: (42)

Amsoil 15w-50

AutomagicLS1

iTrader: (18)

I use Mobil 1 15w-50 here

darkhorizon

Rotella full syn 5w-40

bboyferal

iTrader: (9)

Bingo... The red label Mobile 1.

robert miller

I am with you man.

2001WS6Vert

You always get quite a variety with this question. Definitely use synthetic to prevent coking around the hot turbo parts. I use Mobil 1 10w-30.

edge04

iTrader: (9)

What do you guys use for break in?

robert miller

Rotella same as the 18 wheelers use, only get a bottle of cam junk from com cams and add that also to it....

99.9percenter

iTrader: (2)

Amsoil 0w30

MY99TAWS6

iTrader: (3)

Been running dino 10/40 for first 5000 miles or so but think will go to 20/50 or 15/50 amsoil soon. I don't winter drive the car anyway and figure since have pretty good clearances maybe the 15 /50 or 20 /50 will be better . .

LASTLS1

iTrader: (7)

I run what ever is around the shop 5-30-straight 30, 10-40. I just get it hot a few times and drain it.

Texas_WS6

iTrader: (9)

Your viscosity should be chosen for the enviroment and milage (wear) your engine has. If the engine does not have an external oil cooler you should stick with a synthetic oil because it will handle the heat better. The LS engines oil pan do not reject heat from the oil as well as the older engines oil pans did. The oil temps are naturaly higher in LS engines. Not to forget that now you have introduced another heat sorce the oil has to cool. As far as brands go, what ever floats your boat. Every one will have their own opinion on this. Stick to the major brands, you will not go wrong.

I personaly run a non synthetic VR1 20w-50 oil. But my engine is built with more clearence then stock (for racing), it has forged pistons instead of stock hyperutectic ones (much more clearence), I live an a brutal heat area, I do control oil temps, and I change my oil about every 500 miles, not to mention my oil system holds 12 quarts. I also do not run the engine for extended periods of time.

Aplication, enviroment, built (worn) clearence, cooling, and capasity will be different for different people and should be taken into account when selecting the correct oil. I am sure I have left something out.