Scratching at 2K miles on this experiment with Motorcraft 10W30 Super Duty HDEO in my '05 F150 5.4L V8 modular and I thought I'd fill in with a late report.
VVT Operation: I have been spot checking VVT operation via datalogging since the initial testing and it's still working virtually the same as it did with the RP 5W20. Not unexpected. Winter will be the test.
Oil Temps: Definitely higher. I was on a long trip over the past few days. It's about 95F and humid. Running down the freeway @ 70 mph (empty), I was averaging 213F EOT. Saw 216F a couple of times (FYI (about 210 was the highest I had ever previously seen on the RP 5W20) Under identical circumstances, the RP 5W20 ran about 200F or slightly under. Basically I am seeing a 5-6% increase in oil temp at any given condition. I don't know if this is due to the increase in viscosity or the change from a PAO synthetic base to a mineral. Perhaps both. It really isn't an issue but worth noting intrinsically.
Oil Pressure: Within about 1000 miles the oil underwent it's initial shearing and stabilized at the pressure it's running now. It's running very close to the new "sheared" RP, which was a fairly thick grade 20 (8.7 cST @ 100C) at 60 mph but holding at a higher idle pressure. I would expect the percentages of change idle vs 60 mph, to remain more linear. FYI: Engine now has a P1 filter vs a RP but I can't think of any reason that would have much bearing on anything.
26 psi @ 190F EOT w/ new 5W20 RP
25 psi @ 188F EOT w/ 10K 5W20 RP
33 psi @ 189F EOT w/ new 10W30 MC
32 psi @ 190F EOT w 1.5K 10w30 MC
31-32 psi @ 212 EOT w/ 1.5K 10W30 MC
Oil Pressure @ 60 MPH (1800rpm)-
63 psi @ 192F EOT w/new 5W20 RP
59 psi @ 198F EOT w/10K 5W20 RP
67 psi @ 189F EOT w/new 10W30 RP
64 psi @ 190F EOT w/1.5K 10W30 MC
63 psi @ 212F EOT w/1.5K 10W30 MC
Noise: Engine remains significantly quieter. I always thought my engine was quit for a modular, but it's quieter yet.
MPG: No significant change that I can pull out of the normal inaccuracies of checking fuel economy. My computer mpg readouts, which are always higher than the the miles/gallons calculations, are consistent at least and I don't really see any changes of note there either. Trending very slightly down is the best I can see but it's by a tiny amount.
VVT Operation: I have been spot checking VVT operation via datalogging since the initial testing and it's still working virtually the same as it did with the RP 5W20. Not unexpected. Winter will be the test.
Oil Temps: Definitely higher. I was on a long trip over the past few days. It's about 95F and humid. Running down the freeway @ 70 mph (empty), I was averaging 213F EOT. Saw 216F a couple of times (FYI (about 210 was the highest I had ever previously seen on the RP 5W20) Under identical circumstances, the RP 5W20 ran about 200F or slightly under. Basically I am seeing a 5-6% increase in oil temp at any given condition. I don't know if this is due to the increase in viscosity or the change from a PAO synthetic base to a mineral. Perhaps both. It really isn't an issue but worth noting intrinsically.
Oil Pressure: Within about 1000 miles the oil underwent it's initial shearing and stabilized at the pressure it's running now. It's running very close to the new "sheared" RP, which was a fairly thick grade 20 (8.7 cST @ 100C) at 60 mph but holding at a higher idle pressure. I would expect the percentages of change idle vs 60 mph, to remain more linear. FYI: Engine now has a P1 filter vs a RP but I can't think of any reason that would have much bearing on anything.
26 psi @ 190F EOT w/ new 5W20 RP
25 psi @ 188F EOT w/ 10K 5W20 RP
33 psi @ 189F EOT w/ new 10W30 MC
32 psi @ 190F EOT w 1.5K 10w30 MC
31-32 psi @ 212 EOT w/ 1.5K 10W30 MC
Oil Pressure @ 60 MPH (1800rpm)-
63 psi @ 192F EOT w/new 5W20 RP
59 psi @ 198F EOT w/10K 5W20 RP
67 psi @ 189F EOT w/new 10W30 RP
64 psi @ 190F EOT w/1.5K 10W30 MC
63 psi @ 212F EOT w/1.5K 10W30 MC
Noise: Engine remains significantly quieter. I always thought my engine was quit for a modular, but it's quieter yet.
MPG: No significant change that I can pull out of the normal inaccuracies of checking fuel economy. My computer mpg readouts, which are always higher than the the miles/gallons calculations, are consistent at least and I don't really see any changes of note there either. Trending very slightly down is the best I can see but it's by a tiny amount.