Didn't want to start another GC thread but wasn't sure where this would fit. So far I"ve put 1k miles on GC. When I checked the oil level after the car was hot, the oil was a bit higher the top of the full line on the dipstick. This is the first time an oil has crepped up that far. I think it's the esters in GC. Anyone else notice this? I think it's a good thing. BTW, it's not over filled, when cold it's right at the full mark. I'm looking into whether some of the sluggish I mentioned was due to Mobil gasoline. I've never liked Mobil gas in this area. MAkes all of our cars and friends I know of slow. I used Mobil regular last time but normally use Shell.