TransAmMan

Sorry to ask this... i know it's been done into the ground for sure but my car did not come with a owners manual so i couldnt look up what motor oil the engineers recommended... I was looking into putting redline or royal purple synthetics oil in the next time i change my oil is this a good choice... and if so which one should i putin my motor 5w40 5w30 10w40 10w30 i have no clue... i would look this up in manual but like i said i dont have one. If anyone knows a place online i could look at a manual or download one that would be awesome.

Mike02Z

iTrader: (13)

I believe you can download a manual at www.chevrolet.com. Register as an owner and you'll be able to get the manual. The manual says to use 5W-30 oil. I've read a lot of threads on this subject and most people say AMSOL or REDLINE is the way to go in an LS1

I've always used Mobil 1 5W-30 in all my cars. When I bought my 02 Z I switched to Redline 5W-30 based on the information I got here.

Zo6Killer

Valvoline Synpower 5w or 10w (depending on climate) 30. Trust me. Royal Purple is great, but far more expensive. I run Synpower in all my engines.

Patman

If you use Royal Purple, go with their Racing 41 oil, it's the best oil they've got for the LS1. Their multigrade oils (5w30, 10w30, etc.) aren't as good.

If you use Redline, go with their 5w30.

You might also consider Amsoil 0w30, German made Castrol 0w30, or even Mobil 1 0w40.

(and yes, for those who will ask me later, I have expanded my "recommended LS1 oil list" here)

ZR2877

Not no knock Zo6killer or Mike but when it comes to oil Patman is da man. When ever I have a oil question I just PM Patman. Thanks for the info on the Mobile 0W-40 Patman. I noticed a good increase in oil pressure over the Mobile 5W-30.

deznuttzz28

i used redline 5w30 when the weather is cool and cold, and use redline 10w30 when
its hot..

Patman

You could still use Redline 5w30 when it's hot, it'll work just as well in the hottest weather as their 10w30 does. Redline 5w30 contains no viscosity index improvers. The only Redline viscosity which has them is 5w40, and even that only has a small amount. Redline's polyol ester base oil is extremely shear stable, so no matter how hard you push it, this oil just does not thin out of grade.