liveITup

Ok so I want to run 10w-40 or maybe 15w-40. Any suggestions? I was going to put rotella15/40. Anyone use it in their LS1 yet?

Anthony Williams

iTrader: (3)

I use to in my LS1, switched to Vavaline synthetic for the LS6 due to their mi. Warr

lsxc4vette

iTrader: (9)

Why would you want to go with that heavy of a weight? just asking

safemode

iTrader: (1)

If you live in the north east (which I would have to assume you do with the long island location), Why would you run heavy weight oil like 10 or 15 ?

The Ls1 is made to use 5w30 and if you use full synthetic (which i see no reason why you wouldn't) this should be more than decent for the vast majority of uses. Unless you've redone the engine or have some extreme environment, there is no reason to use a different spec oil. Heavier weights will just lower gas mileage and make turning the engine over in the winter harder.

LeanPocket

iTrader: (6)

5W-30..with 15w-40 it'll run but its not the most efficient, thats more for like towing and stuff if i reckon correctly

Rare96LT1Formula

iTrader: (32)

Use a quality 5w30 synthetic like Mobil 1, Pennzoil Platinum, Royal Purple, whatever. Not sure why you'd want to run that 15W40. Probably not a great idea.

liveITup

i put 10w30 mobil 1 synthetic, oil pressure runs lower than i want. i want to make sure i have good oil and pressure... i know some people who have had BAD experiences with an LS1 throwing a rod or something while running Royal Purple. ive heard other talk about Rotella but i never used it before either, wanted to see who has.

usafws6

iTrader: (10)

well what psi does the gauge read when the motor is warm at idle? im guessing its around 30-40, if its lower than that with 10w-30 then you might want to check your gauge or the oil pump. these cars werent designed to run on 15w-40 thats diesel/flat tappet cam breakin oil(lots of zinc).

omarrakeen

iTrader: (2)

i tried castrol 10-40 and still using it for 1 year now, cant complain. the reason i use 40 is the hot weather..it reaches 116 here so wth

why87

i just changed mine and put amsoil xl 5w-30 in it with some lucas synthetic stabilizer, carries good pressure and purrs like a kitten. that stabilizer is thick as molasses when you pour it out; everybody i have talked to that uses it loves it. when i was running 10w-30 (castrol synthetic) i noticed a slight lifter tick, especially cold. no way in hell would i use 15w-40 though..

1998flamedCamaro

iTrader: (4)

I use castrol edge syn 5w-40