So I'm sure we all know the history of 5 7 Hemi's having needle bearings seize and freeze the rollers, causing lifter failure and grinding down the cam. There are 2 reasons thst I've found that are blamed for the failure. 1. Is that the design of the motor doesn't get enough oil to the lifters or the camshaft at or below ~1500rpm. 2. Is varnish buildup on the internals of the rollers, causing the bearings sticking to the race, seizing, and causing the failure.
As such, it seems that the 5.7 would be better served (not trying to argue that there's a miracle oil) by a particularly high-detergent oil to bulwark against varnish formation, and a high anti-wear additive oil to better serve that cam. I know everything API SN/SN+, GF-5/6, MS-6395 meets standards for the motor, but in my application i want to pamper the motor. Given all that, I can't decide between Pennzoil Ultra and Shell Rotella Gas Truck. In 5w20, theyre both good oils obviously, and I'd normally go with the PUP but it appears from the VOA's I've been able to find it seems that PUP has a lower molybdenum, zinc, and phosphorus count (all of which i believe are markers of anti-wear additives) while at the same time has a higher Calcium and Magnesium count (detergent markers i believe) RGT shows higher levels of the anti-wear additives but has lower detergency. So with PUP having the better base oil and slightly better detergency, it appears that their anti-wear package is a little anemic compared to RGT. Ideally, I'd be happy with an oil with the anti-wear package of RGT and the detergency of PUP. So between the 2, which one, given the application seems more appropriate? Are there other oils thst meet MS-6395 with the detergency levels found in SOPUS oils (PUP in particular) that have higher levels of anti-wear additives (moly, zinc, phosphorus)?
For reference, I do a ~5000 mile OCI with either a Wix or Fram Ultra. My driving is mostly in-town short trips ( And living in New England, ill only use synthetic because -15 degree starts suck
As such, it seems that the 5.7 would be better served (not trying to argue that there's a miracle oil) by a particularly high-detergent oil to bulwark against varnish formation, and a high anti-wear additive oil to better serve that cam. I know everything API SN/SN+, GF-5/6, MS-6395 meets standards for the motor, but in my application i want to pamper the motor. Given all that, I can't decide between Pennzoil Ultra and Shell Rotella Gas Truck. In 5w20, theyre both good oils obviously, and I'd normally go with the PUP but it appears from the VOA's I've been able to find it seems that PUP has a lower molybdenum, zinc, and phosphorus count (all of which i believe are markers of anti-wear additives) while at the same time has a higher Calcium and Magnesium count (detergent markers i believe) RGT shows higher levels of the anti-wear additives but has lower detergency. So with PUP having the better base oil and slightly better detergency, it appears that their anti-wear package is a little anemic compared to RGT. Ideally, I'd be happy with an oil with the anti-wear package of RGT and the detergency of PUP. So between the 2, which one, given the application seems more appropriate? Are there other oils thst meet MS-6395 with the detergency levels found in SOPUS oils (PUP in particular) that have higher levels of anti-wear additives (moly, zinc, phosphorus)?
For reference, I do a ~5000 mile OCI with either a Wix or Fram Ultra. My driving is mostly in-town short trips ( And living in New England, ill only use synthetic because -15 degree starts suck