stick with the non detergent. just cleaning the pan might work. but that's a lot of work.if there is a major overhaul in the future wait till then to swicth oil. if not proceed with caution!busting all that sludge loose at one time can make for a over haul well before planed,and the modern oil will brake it loose.
theres a tool for every job,and that tool is a hammer. it's easy to give advice if it's not your pocket book at stake. A well thought out plan,Is nothing. Untill exacuted twice.
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