beemerphile
New member
T...One other thing I do is change my filter at 3 to 4 thou miles. Its great that the syns don't break down nearly as fast as Dino oils but I find it hard to believe the filters can keep cleaning the oil for that long.
The oil filter will last a couple of oil changes on a healthy engine, not half of one. I routinely cut oil filters open with one of these to look for trouble and check the sediment level. At 10K miles of use, the filters have always had plenty of life left. Changing at every oil change is much more than adequate. Fact is, a dirty filter cleans even better than a fresh one. A filter with a bit of coating has smaller pore size, plus it cleans by both agglomeration and filtration.