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Use of Mobil 1 Extended Performance in a Chevrolet TrailBlazer SS

Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. We'll share the questions and their answers here.
Use of Mobil 1 Extended Performance in a Chevrolet TrailBlazer SS
Okay, I can accept the fact that I messed up, the real question is "how bad is it?" I just dumped 6 quarts of Mobil 1 Extended Performance in my Chevrolet Trailblazer SS - at 500 clock miles. The book calls for GM4718 approval, and I mistakenly thought that since Mobil 1 (5W-30) had that approval, the Mobil 1 Extended Performance (5W-30) also had the approval. Not so.....according to the bottle and the web site. I plan to run the oil for 1000 miles and then change it again (I'm still breaking it in). I will not be pulling anything, and I will keep a max engine speed of 2500 RPM for the trek from 500 to 1500 miles. What am I doing to my engine by not putting the proper approved oil in it for the next 1000 miles?
-- Timothy Allen, Metamora, IL
Although we strongly recommend that consumers use the quality and type of oil specified by their car builder, you are not running any risk by using Mobil 1 Extended Performance 5W-30 in your Trailblazer SS, which calls for a GM 4718M-approved oil. With that said, we agree that you should return to using Mobil 1 5W-30, which is approved against GM 4718M, on your next oil change.
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