I've had a problem, my 02 V8 would produce a terrible rotton eggs smell, like sulphur. I tried different gasolines, no change. Six months ago I started Fuel Power 60 and the problem is now gone. Before it was so bad, I had to roll up the windows and turn on the fan. Now, nothing. If you have the problem, it's worth a try. One day when the exhast smelled like a dead horse on a $hit wagon, the dealer said he could not smell anything that wasn't normal. So, I'm going to keep using FP60 and dump the dealer.