I went to Canadian Tire today (sell auto parts and home stuff) to research brands of oil.

Specifically, which ones met the standards set by GM for Coblats. I primarily looked at semi synthetics or full synthetics. So this isn't a complete gospel, but it does say which synthetics or semi-synthetics meet these standards.

2.2L and 2.4L is GM6094M
2.0 S/C is GM4718M

Start off with which oils meet specs for 2.2L-2.4L

Castrol syntec
Castol Syntec blen (semi-synthetic)
Amsoil
Mobil1

2.0 S/C

Castrol syntec
Mobil 1
Amsoil
Valvoline (synthetic)

Quaker State, Penzoil and Canadian Tire Motomaster said nothing about either of these standards wether it was synthetic or regular oil. Guess it didn't meet them.

I checked out Redline oil but was disapointed it had no mention of these GM standards.
It did have an alphabet sop of letters (ACEA, E2,B5, A5) and API cf/ch-4/sh/sj/sl but I have no clue what they mean.

And Royal Purple wasn't sold there. Hope you find this useful.

 

made few corrections

 

This is the response I got from Redline oil:

Mike,

The labels won't list the GM motor oil specs but would satisfy it if tested.
We list the API and the ACEA designations as they are the more
universal requirements. It certainly does start to look like alphabet
soup.


Take your chances with Redline I guess.

 

Also make note that Mobil1 is one of the very few Synthetic oils that actually has a fully synthetic base.


Castrol Syntec is not synthetic at all, maybe synthetic additves but it has a dino oil base.

 

Im going to use Mobil1 and nothing els in my baby. Its great oil and recomended by GM. What more do you need?

Later

 

just to add the saturn dealer i work for and other within the company use and only supply royal purple for oil changes in the RL, so same motor, same company royal purple is good to use FYI, if anyone says other wise i think i know about 5 dealers who would then be voiding every RL warrenty that came through the place and i cant see that happening