My Nissan is running great — so great that I forgot all about its oil changes, for about two years. Walked past an auto shop tonight and thought "duh, it’s been HOW LONG??". Checked the dipstick, thick black gunk. Added some fresh oil. Will get the oil changed tomorrow. I feel terrible because I used to be meticulous about this and then suddenly got all space cadet on my poor car.

That said, I’ve been trying to figure out what else I should do to help my car recover from this abuse. I’ve been looking online and see videos of people disassembling and cleaning engines coated with thick black goo. As bad as I think it is, it probably isn’t quite that bad, since it seems to be running fine and I’m not having any smoke or other problems. Will the fresh oil mix with and soften up the old, thick oil so it will leave the engine more easily during the oil change? Would it be advisable to have a series of oil changes every month or so for while to help clean out the engine, or is that pointless? I’ve seen some discussions of adding transmission fluid for a short time and then changing the oil again as a flush. Advice, please! Thanks so much.

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