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engine oil contamination
Posted to Castrol Forum on 5/9/2019 12 Replies

Got a question for Castrol. We have a fairly fresh rebuild on a 2007 5.3 GM AFM engine that has some type of contamination that has darkened the 5-30 Mobil 1 synthetic in about 2500 miles to the point of gumming up lifters and requiring teardown. Not sure what... Login to read more.

12 Replies Received (View Replies)