Been using 100ml per three qts of mos2 in PUP 5w30 with mileage of 40+ mpg on 12' Hyundai Accent with E 0 gas. I have nothing bad to say about Mos2. It has quieted the engine and the is idle uber smooth. Even if it was placebo, 100ml is far from throwing off the 3qts of PUP. It does work for my application; though each person's results shall vary.