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Join Date: Aug 2011
Location: Monticello, IL
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I don't have a 392, but I swear the Pennzoil Ultra 5w20 I had the dealer put in my R/T the one and only time actually caused my 5.7 to be noisier than when I ran Mobil 1 5w20 both before and after that change. I went back to Mobil 1 EP 5w20 after the Pennzoil Ultra and it sure seemed to be a lot quieter. Whether that would translate over to the 392 and 0w40 or 5w40 (Chrysler says 0w40 now for all 392s) I don't know, all I know is that I've had better luck with Mobil 1.
2016 Challenger R/T Scat Pack, B5, 6-speed, SPAG, WRTs, sunroof, SGII, Convenience, Tech and Leather; UPR catch can, skip-shift eliminator, Mopar splash guards.
2006 Jeep Grand Cherokee Laredo, Inferno Red, 4.7L V8
RIP 11/2/14 - 2011 Challenger R/T Classic GWE 6-speed