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Re: excessive engine noise after changing oil to synthetic??
I am a mechanic, I know that changing to a synthetic after the engine bearings have been worn by mineral deposits in the regular oil will cause the Big End Bearing (where the conrods attach to the crankshaft) to wear and break. The only true way to switch types of oil is to drain the oil, fill it up with kerosene, drain the motor again, take of the engine sump to remove all traces of oil and then replace the Big End Bearings. Be careful, if your engine is making noises, it could be ready to let go already! Last time I saw this was a conrod ending up out the side of the block...
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