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If you use a good quality oil and change it out on a regular basis there is no need to even consider other additives. If with high mileage you find excess sludging, use whatever you can find to clear the gunk. There are a number of products you can use to clean without mechanical disassembly--products for unsticking valves, kerosene flushes, automatic transmission fluid, and others. Just make sure that the engine is vented and not clogged and all will be fine.
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2007 V6 Camry LE, Built TMMK 27 September 06
"People who think they know it all are particularly irritating to those of us who do."
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