I put a Volvo remanufactured 4 cylinder Turbo B230FT in my car back in June. It was started up with Mobil 1 10W30 and has had two break-in oil changes in the last 7,000 miles. One at 1000 miles, 3000 miles, and will be changing out the third fill at 8,000 miles. I have seen very little evaporation or useage. Even averaging 70 mph for 2,400 miles there was almost no oil usage on this fill. There has been a slight usage but very minimal not enough to justify opening a bottle to pour in 1 or 2 ounces. My engine at idle is very quiet and smooth as was the original motor when new. Mileage has gone from 26.8 mpg to 30.6 mpg highway since dropping in the motor. I figure that is from things loosening up and the rings setting. Hoping for another 1 or 2 mpg as I get up to 10,000 miles. Volvo recommends 5,000 mile oil changes so have to follow the rule book for warranty reasons. I'm thrilled with the Mobil 1 and the 5,000 mile oil changes. Even when the car was new the oil never stayed this clean for this long. This Mobil 1 has a tinge of color to it with 4,000 miles on it. By 3,000 miles the Pennzoil oil would be close to black. The original engine ran to 282,700 miles on 3,000 mile Pennzoil oil changes. Both engines have always used Volvo OEM Mann oil filters. I'm not a Mobil 1 Cheerleader, I only went to it with this new motor for gas mileage reasons. Before June of this year I had driven over 775,000 miles running Dino in my cars. I just kept reading posts about all the noisey valve trains that were coming up with those using Mobil 1. I'm reading them and saying mine isn't doing that. Just thought it was time to put in my two cents on the Mobil 1.