Anyone have the going oil recommended for c5's. I hear too many opinions from people other than owners. Not gonna do it unless ya'll have the best suggestions. Thanks

 

what's wrong with Mobil 1 5w-30?

 

Is that an overall good weight for geographically west texas?

 

i use the mobil 1 5w-30 with a ac delco filter

 

Is that an overall good weight geographically for west texas?

 

Ok cool, I guess its sufficiant since your in Colo...

 

Me too!

 

Add me to the M1 list.

 

use whatever oill you want with the new GM DEXOS or old 4718 approved label. It just so happens that the Mobil 5w30 is usually the cheapest and gets pretty good reviews in every used oil analysis report ever posted.

 

What's different about West Texas? It's good where ever...

 

Just what are you asking?

 

So far I've stuck with Mobil 1 5W/30 which is the GM recommended oil. You can use any GM4718M approved oil but it must be synthetic. If heard of a few members who use non approved oils but generally because they trust the brand and the oil is of known quality but the manufacturer hasn't gone through the approval process.

I've attached the latest list of approved oils below. All the approved oils are low viscosity, winter weight oils.

In West TX your temperature range is higher than most (I'd say 32F to 110F). In my time in San Antonio I only saw temperatures dip below freezing once in 3 years so you might get away with a lighter oil. Even so why risk anything lighter than 5W/30 or 10W/30? There are still plenty of choices if you decide to go 10W/30. In England my choice is easy. I used 5W/30 in Vegas for 3 years without any variation on operating temperatures/pressures of the engine or any starting issues but my car was garaged overnight. Like West TX, winter temperatures were rarely much below freezing and I saw 136F in Death Valley once.

GM4718M Registered Products

76 Super Synthetic Motor Oil 5W-30, 10W-30
AC Delco Full Synthetic 5W-30
Castrol Edge 5W-30, 10W-30
Castrol SLX Professional 4718 5W-30
Chevron Supreme Synthetic 5W-30, 10W-30
Coastal High Performance Full Synthetic 5W-30
Kendall GT-1 Ultimate Synthetic Motor Oil 5W-30, 10W-30
Mobil 1 0W-20, 0W-30, 5W-30, 10W-30
Northland, Synergy Synthetic 5W-30
Pennzoil Platinum Full Synthetic 5W-30, 10W-30
Pinnacle National Synthetic 5W-30
Q HorsePower 5W-30, 10W-30
Service Pro Full Synthetic 5W-30
Texaco Havoline Synthetic 5W-30, 10W-30
Valvoline SynPower 5W-30, 10W-30
Warren Full Synthetic 5W-30, 10W-30

 

I use Amsoil Full synthetic in my engine, tranny, and rear end. Awsome stuff

 

Amsoil 0w30 and a Wix 51042 filter in my 02Z.

\db2
carolina

 

I run AMSOIL's racing oil in my Z06 now, but used their top tier synthetic in my 06 CTS-V (LS2 engine) that was my daily driver from 06-09 and got good used oil analysis results.
AMSOIL Signature Series 100% Synthetic 5w30 (Product Code ASLQT)

Cadillac CTS-V Used Oil Analysis - AMSOIL 0w30
Note: Jun 07 sample was Mobil 1 5w30, the rest AMSOIL Signature Series. Wear metals primarily Aluminum, copper, iron, lead. Total Base Number a measure of the oil's remaining life (higher better) based on resistance to acidic buildup of engine exhaust byproducts making the oil more acidic over time.

 

I use Redline in mine

 

I use Mobil 1 5W30 in mine - it will be just fine for you in west Texas too.

 

mobil 5w30 came with the car so stick with it, and drive like you stole it. that is what i use in mine and have had no problems.

 

Amsoil 20w50 here but not a stock motor...

 

I have been advised to use 10w/30 and at the time of an oil change to add a pint of marvel mystery oil to my 2001 vette.
has anyone heard abt or done this before.
says that it expands the rings around the valves and minimizes wear, is this true?