I am presently running Mobil 1 5-30 in a '00 Silverado. But after reading all these posts about the uncertainity of the Supersyn Mobil 1, I am thinking of trying AMSOIL 10W-30 for the summer. I am like Bror Jace and kinda worry about all this media hype. However, AMSOIL is about $7.00 per quart in Texas. Redline and Schaeffer would have to be shipped. Bottom line, is AMSOIL better than Mobil 1 when you consider the price difference? Any test results for AMSOIL? (I am not into extended drain intervals. Change at 3K regardless) Thanks!