I went a little ways over my usual mileage limit for my oil change. Before I used synthetics in my Jeep I used to dump in a can of one of those oil detergents right before I drained in order to clean out the crud. Can these be useful if I'm using synthetic oil? I'd think not, but it seemed at the last couple of changes that I wasn't draining anywhere near the 4 quarts I should have been, even though checking the oil level beforehand showed everything normal. Makes me wonder what I got in there.
Thanks,
TC