Re: oil detergant or non det.
The Flathead im running in my car now is a 52,and when i got it i took oil pan off and got all the sludge cleaned out,cleaned the oil pump pickup screen and put all new seals in motor.After all that i filled up with 15-40 motorcraft oil.I have had good oil pressure and no problems since and have put around 5,000 mile on it.I made sure that after i put a 100 or 200 miles on it i changed because there is still sludge that will break down.I have several cases of non-detergent but chose not to use.
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