rbs62ExplorerDec 22, 2016Oil additive f350. 7.3 2001What is best oil additive to add to 7.3 with 171000 miles?
lawnspecialtiesExplorerDec 23, 2016I use Motorcraft PM-22 in my 6.7. PM-23 in the wintertime. Its actually recommended but we're comparing two different engines.
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