I find if you break your car in (drive 190 miles without oil change) and then change the oil after the 190 mile "break in", you get the best results. The Viper with 1100-ish horses sounds about right. Unfortunately, it won't stay that way. Keep racing it in some of those longer professional series and you'll wind up driving many miles with dirty oil, which means you'll inevitably lose some of those horses permanently.
You'll think me crazy but I like the way this works in GT3 better than it does in GT4 (several hundred miles before light comes on and no "break-in".) 👎