Don't get upset with these questions but
Why are using changing oil so much? This is totally unnecessary. It did not help, did it?
You should have driven it with the dealers oil till it was time to change via the service manual or what they told you. If I was the tech I might get upset that you did this, he may have used EOS (GM Engine Oil Supplement FM) and now you drained it out within 70 miles.
I drove my car the first year with the factory oil and changed it with about 5,400 miles. That was last Sept 15, 2002 and I have gone since then on the sale oil to about 13,000 miles, the oil light came on yesterday. No piston slapping here. If all the frequent oil changes was good, then my engine should be in worst condition than yours. Uses no oil yet.
btw-It has been said and I saw the TSB that LS1 Camaro and Firebird engines were factory filled with Mobil 2 from Sept 2001 to the end of production, this was confirmed by Scott Settlemire of Chevrolet. So if your car was built after Sept. 2002 it came with synthetic Mobil 1 5W-30.
I have changed oil 2x in 13,000 miles and 2 yrs. How many oil changes have you done?
Again, don't get mad at me but I think you are listening to other peoples advice when you should be going by what the owners manual says.
[ September 02, 2003, 03:22 PM: Message edited by: Mike ]