I have used Mobil1 20 years or more in 3 Volvos and 3 Saturns and 1 Mazda. I started all around 10K miles and they all used virtually no oil between ANNUAL changes. I did replace filter @ 3-4K and made up the diff of the filter change. The Volvos succombed to rust between 200-300K but the engines were flawless.
This will probably freak the oil fanatics going 10-15K between changes, but I have a success at doing it. The Saturn even took virtually no make-up oil since it had a drop-in element filter and still uses no oil in 50K so far.
I just loaded up my "new" 2001 Impreza OBW w/ Mobil1 and expecting the same.
I am considering a switch to Amsoil, comments?
