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Old 02-17-2017, 11:45 AM   #5
Stock Boy
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Drives: 2014 1LE
Join Date: Oct 2013
Location: Northern Virginia
Posts: 433
Another vote for Castrol SRF. I've boiled RBF600 numerous times, but I haven't tried 660. No issues with SRF though.
Not stock anymore... cuz my engine done blowed up
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