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Thread: Oil Sludge?
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Old 02-18-2011, 04:36 AM   #28
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Join Date: Mar 2008
Location: Canberra, ACT, Australia
Posts: 4,543
My Ride: Ex 325CI owner
Best not to use M1 0W40 with RX as it has ester content. I use Shell Helix Ultra 5W40, a Group III basestock oil with no ester or PAO content.
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