Mregor

I am in a class and we are talking about standards. We need to brief the class on a standard, what is the standard, why developed, etc. I chose GM4718M corvette oil spec. I can't find what the limits of the standard are? Anyone know where I can find this? I tried API and google search but get nothing as to the actual standard dfinition.

Mregor

glennhl

GM4718M is a GM standard. I'm not sure where you would get a copy of it, most likely from an GM employee. Why not choose a Military Standard, there are thousands of them. If you want one of the more interesting ones, pick the Mil Standard for Fruit Cake bars: Mil-F-3897C


http://www.everyspec.com/MIL-SPECS/M...F-3897C_12795/

bob guzzy

How about the Mobil 1 site I'm sure they have an expanation of the oil they use in the corvette since the 90's

Gannet

It's not really a "standard", it's a specification. The oil has to have certain performance characteristics. In order to be certified as a 4718M oil, the oil has to not only meet the specification, it also has to be submitted to GM for testing (and periodic retesting). Only GM can certify it as a 4718M. That's why you have to read oil ads carefully. Several oils will say they "meet" the 4718M spec, and well they might, but they are not 4718M certified. If an oil company goes to the trouble and expense to get certified (it's not free), they will say so.

IMO, the best 4718M certified oil right now is Quaker State Q Horsepower Full Synthetic in 5W-30 or 10W-30.

glass slipper

You're going to have to get a copy from GM. I can tell you it's modeled after the ASTM Sequence IIIE test which is summarized here:
http://www.swri.org/4org/d08/Abstracts/GasEng.pdf
Scroll about ¼ of the way down.
You can also buy a copy of the Sequence IIIE test here:
http://www.astm.org/DATABASE.CART/WITHDRAWN/D5533.htm
The Sequence IIIE test has been superceded and is no longer used though. You can see the replacements in the link above.

I can also tell you the GM 4718M specs have stricter requirements for oxidation/thickening (as measured by percent increases in kinematic viscosity) and volatility/boil off. But if you're looking for an actual spec for your class, you might be better off just buying the Sequence IIIE test or any of the ones that superceded it. Getting the 4718M spec from GM may take a little doing...you might try starting with GM Powertrain and it may help if you know somebody. You can contact them here:
http://www.gm.com/utilities/contact_...tacttopic=GMPT

Here's contact info to a person at another place that may be able to help you:
http://www.swri.org/4org/d08/GasTest...st/contact.htm
Call and ask him if he can get the 4718M specs for you...if nothing else, he may be able to give you the Sequence IIIE test for free. Good luck!

Mregor

Thanks for the info. This should help.