Mobil Delvac Extreme 10w-30 14.8K miles 2020 RAM 2500 6.7 Cummins 67.5K miles total

[GuyB]

Really happy with these Blackstone results. Ran this to verify 15k oil change intervals are OK with this engine and looks like it would easily run even farther. Use is about half towing a 5k RV trailer getting 14-15 mpg and half long distance trips empty getting 23-24 mpg. This is an advertised full synthetic diesel oil that can be had for around $20/gallon on sale.

14,800 miles on this sample.
ALUMINUM 8
CHROMIUM 1
IRON 46
COPPER 7
LEAD 0
TIN 1
MOLYBDENUM 42
NICKEL 0
MANGANESE 1
SILVER 0
TITANIUM 0
POTASSIUM 16
BORON 29
SILICON 10
SODIUM 4
CALCIUM 1698
MAGNESIUM 446
PHOSPHORUS 929
ZINC 1164
BARIUM 0
cSt Viscosity @ 100°C 10.8
SUS Viscosity @ 210°F 62.1
Flashpoint in °F 420
Fuel % <0.5
Antifreeze % 0.0
Insolubles % 0.2
TBN 5.0

Mobil specs for this oil.
Flash 426 F
HTHS 3.6
Vis at 100C 11.8
VI 140
TBN 9.6

 

[Oliveoil2]

How much oil did you add over the 15k?

 

[fantastic]

That Extreme product is showing it's perfectly capable. You plan on staying <15k oil drains or ? Thanks

 

[wwillson]

The Fe is 3.1ppm/1k miles. That's pretty outstanding.

 

[GuyB]

I plan to carry on with 15K intervals.

 

[GuyB]

I added no oil over 15K miles.

 

[OLEJOE]

Looks really good. Thanks for sharing.

 

[Plumb Bob]

Nice report. Can run it a lot longer.