Thread: Oil Analysis of 11K Mobil 1 Ext. Perf.
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Old 07-22-09, 11:24 AM   #9 (permalink)
Ryan818
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Join Date: Mar 2007
Location: Pittsburgh, PA
Posts: 59
I've been using Royal Purple for the past 8-9 years. Always go 10k miles. The guy whom rebuilds our race engines said he's never seen an engine so clean after a season. Anybody else use RP?
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