BOWTIE

Amsoil 5-40 European formula, and Amsoil long filter (late model truck filter).

o2man98

From what I have experienced the Series 2000 0w-30 and the European 5w-40 have really been good with the LS1 based engines. I am currently running the Amsoil HDD 5w-30 for its add pack. Also using Amsoil SDF64 filter.

equandt

iTrader: (2)

AC Delco PF-46 and 5w30 Mobil1
No secrets, just what the factory ordered.

MTCLS1

Pennzoil 10w40 Synthetic and Fram Toughguard

TJ

iTrader: (10)

german castrol 0w30
pf46.

tirefryer

Amsoil 5W40 European and the longer K&N HP2006 oil filter. The 5W40 really quieted down the motor vs. the GC 0W30 I was using. Piston slap on cold startup is almost gone.

JustAnIlluzion

iTrader: (60)

M1 5w30 with a purolator one filter

Orange Terror

Mobil 1 10w30 with a Fram filter, been using them for years on all my vehicles, great results. Plus the Fram filter looks good with the Hugger, lol.

-Joseph-

iTrader: (12)

Nothing special: 10w30 Castrol GTX, AC-Delco filter

hourang

iTrader: (6)

castrol syntec 0w30 german stuff with mobil 1 filter.

SSCamaro99_3

iTrader: (1)

Same.

Blue Hawk

Mobil1 5w30 and AC Delco filter.

jmm98LS1

iTrader: (28)

german castrol 0w30 and K&N filter

crainholio

iTrader: (2)

Mobil-1 5W-40 (Truck & SUV) synth, Baldwin oil filter.

windshear

mobil 1 5w-30 and mobil MI-206 oil filter.

SS DNA

iTrader: (7)

What about Royal Purple ???

I know its expensive and I could get a 5 gallon of Mobil 1 synthetic for I think 20 dollars at WalMart but I would like to know if its worth buying it over Mobil 1.

Nittany_marine

iTrader: (7)

I use 5W-30, and stick with the stock AC Delco filter. No problems as of yet.

Viper

iTrader: (6)

GTX dino 10w40 and NAPA gold filter. 1500 miles on new motor, will probably stay dino oil this motor

davered00ss

iTrader: (4)

Mobil 1 5W30 and a Nappa Gold filter.

BOWTIE

The general concensus (sp) among those that have researched and studied the oils and oil samples used in LS based motors is that the regular Royal Purple oils (5-30, 10-30, etc.) are too thin and do not offer the protection LS based motors need. The higher end (and much more expensive) race oils do, but they are not worth the extra cost. Also if you decided to go with Mobil 1, those same individuals/individual recommend using the 0-40 if you can find it instead of the 5-30 or 10-30.