[Ford Man]

I've used various brands of conventional 10W40 and various brands of oil filters in my '88 Escort with oil change intervals usually at 3-4K miles and filter every other oil change. My theory on oil changes is that a few extra quarts of oil is much cheaper that an engine overhaul. There have been a few times in its lifetime that it went 5-8K between changes when I'd be busy. Last time I changed the oil I had let if go about 7500 miles on each of the 2 previous oil changes and left the filter on for both oil changes, when I changed the filter I cut it open to see what was in it and it wasn't but probably 10-15% blocked. It has 481K+ miles on it now and has never had any type of oil related engine problems. For that matter it's never had any engine problems at all. It currently uses a quart of oil about every 1000-1200 miles. I'm not using high mileage oil in it. Maybe when it hits 1,000,000 miles I'll consider it. LOL