Which 5W-20 doesn't make it sound like a "thresher"? PUP and PP 5W-20 (which might be the same oil in a different jug) make the engine just as noisy. I'm about to go to Castrol EDGE 0W-40, because M1 FS 0W-40, while an improvement, wasn't that big of an improvement, but the MPG sure saw a dip. If I take an MPG hit, at least I want a nice sounding motor
Due to their pursuit of better fuel mileage, Chrysler built the 5.7 cam phasing system and MDS around 5W-20. Unfortunately, only low viscosity oil can allow these to react fast enough to engine loads and demands. I'm 110% sure that if anyone went to an even thinner oil in a HEMI, the fuel savings would be even bigger. However, the valve train wasn't built for low viscosity oil.
Lubegard Bio-Tech is a nice additive for cleaning an engine but doesn't do much else. I've seen it before remove varnish left from cheap motor oil. However, it took several thousand miles to do its job. That's because the friction modifier needs to be part of the oil formulation to avoid competing for the surface, like Moly in RedLine, for example.
Castrol EDGE 0W-40 uses a Titanium-based friction modifier. As a result, it activates at a lower temperature than Moly-based friction modifiers. Are there others here running Castrol EDGE 0W-40 in their HEMIs?
@Hemi395 What's your take on this?
I got a magnetic drain plug, and every time I drain the oil, I still get a few larger metallic particles that I can see sparkling in the sunlight. I'm at 36,000 miles. Could that be debris leftover from the assembly process?