First you shoot them, then shoot them again!!! David

 

It doesn't have to be Mobil 1, but it darn well better meet GM4718M. If you're going someplace that can't tell the difference you need to go elsewhere.

 

During "normal" driving on the road, according to the read out in the DIC, the oil temperature is slightly above the coolant temperature which is perfectly normal. Even dino oil will live at those temps.

Must be another reason they want GM4718M oil used. (I always use Mobil1)

RonJ ...

 

I use German Castrol 0w-30 with K&N filters. If Autozone is out I use the Mobile One European 0w-40. I change every 2500-3000 miles, oil always looks good.

 

 

Mobil 1!!!

 

Hummm....wonder where the original poster is? No comments from them since the original post.

 

There's a bunch of you that haven't read your owner's manual. While GM put synthetic oil in our cars at the factory (and it's a good oil that I've used for years in all my vehicles), GM DOES NOT REQUIRE SYNTHETIC!!!

What they require is an oil that meets GM spec 4718M and an oil that is API approved. It may well be that only synthetic oils will meet the 4718M spec, but whether it's synthetic or not, what counts is that it meets the 4718M spec.

What the OP needs to press with the people that changed his oil is whether the oil used met the 4718M spec. If not, they need to change it to an oil that does meet the 4718M spec (not all synthetics even meet that spec).

 

I usually change my oil every 1,000 - 1,500 miles, whether it needs it or not.

 

 

Mobil 1 only............

 

We probably convinced him that he should stay miles away from this forum again.

Looking for a post from the next newbie. Let me at him.

LOL

 

My CTS says Mobil 1, 10W 30 on top of oil filler cap. Owner's manual says 4718 may be synthetic. Other forum posts talk about choice of dino or synthetic oil (choice given by service mgrs). Heck, when I was driving a $1000 piece, I even used Pep Boys oil (for a very very very short time). When I smelled the parafin in hot oil from Pep Boys, I got rid of it. With the price of these cars and warranties, I will use synthetic. Cheap insurance. Note the recent sales on syn oil. I need to stock up.

 

GM DOES require synthetic for Corvettes, by virtue of the spec.

Y'think??

Oil meeting the 4718M spec IS synthetic oil. It's a 100% synthetic oil that is not the usual base stock from crude oil. Instead, it is synthetically built in the laboratory from the ground up on the molecular level to create a "polyalphaolefin" (PAO) base stock. "Blends" of synthetic oil that are cheaper than the true 100% synthetic typically are crude stock with added chemicals that "hydroisomerize" the crude base stock to remove some of the undesirable molecules... like wax. They're removed in a laboratory chemical reaction (so they can be considered "synthetic")...but they're still from crude base stock and so are not to be used by us.

The reason is, the further from true PAO base stock you get and closer to the hydroisomerized base stock you get, the more oxidation (thickening) and volatility (boil-off) you can get at higher temperatures. The spec that a Corvette calls for, 4718M, was created by General Motors FOR Corvettes. PAO synthetic oil is also called for in Porsches, Vipers, and all AMG models from Mercedes-Benz.

I think I'll stick to my Mobil 1. but you can probably use any high-quality PAO synthetic oil meeting the 4718M spec. Of course, you could put any old Fram filter on your car, too!

 

If he wasn't caring enough to make certain that he got the correct oil poured in, maybe he shouldn't own one? It is right on the oil filler cap after all, how much more obvious does it need to be for anyone?

 

Ford recommends that you use BP Amoco gasoline and puts the BP logo on the gas cap of their vehicles. Does that mean I can't use any other gasoline in my wife's SUV?

 

 

Its a Ford, 'nuf said.......