Pennzoil Ultra 5W-20/0W-40 mix, 4K miles, '22 F-250 7.3L gas

[doyall]

Oil in use one year and a few days. Towards the very end of interval was ~3,400 miles over 5 days of towing a 7,500# (total) U-haul trailer with vehicle to Moab from Alabama and back. (FWIW, averaged 8.1 mpg on trip out and 9.1 mpg on trip back. Engine worked pretty hard.) Day after trip was a ~18 mile each way trailer return and then a few days later a 4 - 5 mile warm-up before oil change. Oil mix was 5 quarts Pennzoil Ultra Platinum 5W-20 and 3 quarts Pennzoil Ultra Platinum 0W-40. Ford specs 5W-30. I have a good bit of xW-20 to use up from a prior application so therefore the mix. Widman calculator suggested a 10.3 cSt @ 100°C start.

Kind of disappointed with fuel dilution. At 1.8% it probably accounted for most of the decrease in viscosity. At least it stayed in grade.

 

[fantastic]

I keep learning more & more about the 7.3 gas. Didn't know it spec. 8 quarts of oil. It seems to be a great engine & is exactly what I recommend for that weight towing. 8-10k is in the sweet spot IMO. Gasoline just works higher up in the rpm's as it's nature so don't sweat it. Silicon from break-in etc. So you'll be moving to the 5w-30 once the 20 is used up?

 

[FZ1]

Oil in use one year and a few days. Towards the very end of interval was ~3,400 miles over 5 days of towing a 7,500# (total) U-haul trailer with vehicle to Moab from Alabama and back. (FWIW, averaged 8.1 mpg on trip out and 9.1 mpg on trip back. Engine worked pretty hard.) Day after trip was a ~18 mile each way trailer return and then a few days later a 4 - 5 mile warm-up before oil change. Oil mix was 5 quarts Pennzoil Ultra Platinum 5W-20 and 3 quarts Pennzoil Ultra Platinum 0W-40. Ford specs 5W-30. I have a good bit of xW-20 to use up from a prior application so therefore the mix. Widman calculator suggested a 10.3 cSt @ 100°C start.

Kind of disappointed with fuel dilution. At 1.8% it probably accounted for most of the decrease in viscosity. At least it stayed in grade.

View attachment 156417

Looks good for brand new unit.

 

[blufeb95]

So this is was the first change after the factory fill?

 

[doyall]

...Gasoline just works higher up in the rpm's as it's nature so don't sweat it. ...

But it sure is thirsty up there!

... So you'll be moving to the 5w-30 once the 20 is used up?

That is the plan.

 

[doyall]

So this is was the first change after the factory fill?

Dumped factory fill at ~1,500 miles. The test was done on the second fill.