I have a few vehicles that are driven less than 1,000 miles/year, I think I drove the pickup only twice this year (about 100 miles total). Would an oil analysis tell me if my year-old oil is still good? Would I need the TBN test for it? Could I stretch my yearly oil change to maybe two years if I used something like Castrol Edge? I probably wouldn't bother changing the oil filter, but that would leave about a quart in it.
Thanks for your input
Thanks for your input