Same as the motor full synthetic 20-50. When I drained the factory fill It was thicker, I think it was 50 or maybe 60weight. Tried running ATF for a few miles but that made the chain really noisy so I drained it out. Plus the Mobil 1 syth ATF has a real strong smell and that can get confusing if your watching out for a stator problem odor. When it was still in the drain pan, my wife passed thru the garage and asked me if perhaps an animal pee'd inside the garage without me knowing it. I found that interesting.