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Originally Posted by J.C.you
Along the lines of the thread, what’s preferred preference on anti sludge additives? We run a 3valve 5.4 ford service van. These motors are notorious for sludge buildup and low service life.
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Had a buddy who used to make good coin changing out engines on these back in the day. He said the trick for squeezing extra life out of 'em was changing the oil every 3K miles using full synth oil. May help running a product like Seafoam in the crankcase right before an oil change every 2-3 oil changes.