Oil requirements for 2005 MY GM cars

[Aurora40]

[font=Arial, Helvetica, sans-serif] 2005 GM gasoline engines require the use of an engine oil that has the American Petroleum Institute (API) Starburst AND states that it meets GM Standard GM 6094M (non-synthetic) or GM4718M (synthetic). Failure to use the recommended engine oil can result in engine damage not covered by warranty.

Figure 17 is the list of engine oil brands that meet GM Standard GM 6094M and 4718M as of February 4, 2005.This list will be updated and will be in the Techlink Reference Guide available at http://service.gm.com.

From: http://www.gmtechlink.com/images/issues/mar05/TLMar05e.html#f17


Of note is that not all synthetic oils meet GM's "synthetic" service requirement. Only three oils on this list are approved for motors that require synthetic oil.
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[Rob]

From: http://www.gmtechlink.com/images/issues/mar05/TLMar05e.html#f17


Of note is that not all synthetic oils meet GM's "synthetic" service requirement. Only three oils on this list are approved for motors that require synthetic oil.
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This is a very good point to make.

 

[Bernievw]

There are actually two versions of Mobil 1 - They also make a Mobile 1 Extended Mileage in addition to the "regular" Mobil 1. Difference is about five bucks for a 5 quart container. Are both of these approved??

 

[Aurora40]

There are actually two versions of Mobil 1 - They also make a Mobile 1 Extended Mileage in addition to the "regular" Mobil 1. Difference is about five bucks for a 5 quart container. Are both of these approved??

Mobil 1 Extended Performance is not GF-4 rated, so you would not want to use it in a 2005+ model year GM car if you want to retain warranty coverage.

 

[Bernievw]

Damn! I just changed yesterday, and used the extended mileage stuff. Well, back to the store tomorrow morning. Thanks for the info - When I looked, I thought if Mobile 1 is good, the Extended must also be good. According to Mobil's web site, you're right on the button. I'll be more careful in the future.

 

[Baldie88]

More Questions

I went to the website listed and found this from the May 05 issue:

[font=Arial, Helvetica, sans-serif]We recently received this e-mail from Mike McQuoid, at Norman Gale Pontiac GMC, Cedar Knolls, NJ:

“In the March 2005 issue of TechLink, there is a list of motor oils approved by GM for use in gasoline engines. I'm curious why so many “full synthetic” oils are listed in the “non-synthetic” list and not in the synthetic list.”

Here’s the answer from GM Powertrain:

“GM4718M is General Motors' High Performance engine oil specification. Oils which meet GM4718M tend to be made from synthetic base stocks, so it is often referred to as a "synthetic" specification.

“However, not all oils, synthetic or otherwise, are capable of meeting the stringent requirements of GM4718M. Only the oils listed on the GM4718M Registered Products sheet have proven their performance to the specification.”[/font]

[font=Arial, Helvetica, sans-serif]- Thanks to Matt Snider, GM Powertrain[/font]

So now my question is, is this for only the high performance engines? I've got a 05 Impala with the 3.8 engine and I've used Valvoline for years. Since it's not on this list can I still use it?

Ron
"Baldie88"