When I got my Ford, I'm not sure what brand the previous owner was using. He may not know either since he had it done at a garage. I've only done one oil change so far and I went with Pennzoil Platinum. Now, I see Mobil 1 has really dropped in price at Wal-mart. So, I picked up Mobil 1 for my next oil change. Is switching brands frequently okay? I always learned growing up that you pick one brand and stick to it. Only stray from your chosen brand if you're in a pinch.