Ford Mustang Forum - View Single Post - V6 Engine removal and replace
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post #11 of (permalink) Old 04-09-2014
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Joined: Feb 2011
Location: San Diego
Posts: 2,622
I'd do a used oil sample after any switch to 30 weight. I was using Red Line 5w20 which has a viscosity of a 30 weight oil, and found through a used oil analysis that I had more copper wear than average. Went back to Pennzoil Platinum 5w20 and my wear numbers were better than average. I'm not saying all 30 weight oils will perform similarly, but it appears Ford has designed their motors for 5w20 and its flow characteristics.

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