Amsoil AME 15W40, 12K, 04 Duramax

[TXHunter]

Our move 1yr ago drastically changed the driving routine for my LLY. Went from ~60 miles per day commute down to less than 5. With all of the short trips I wanted to get a sample submitted at 1yr to see the differences. Oil was not changed during this sample.

Make/Model: Isuzu 6.6 Duramax LLY
Vehicle: 2004 Chevy 2500HD

Code:


OIL AME 15w40 AME 15w40 AME 15w40 AME 15w40 AME 15w40 AME 15w40 AME 15w40

MILES IN USE 12,406 20,617 24,757 21,779 19,779 12,006 9,006

MILES ON UNIT 181,364 168,598 147,981 145,003 123,224 115,451 112,451

SAMPLE TAKEN 8/9/15 8/9/14 8/9/13 6/13/13 6/13/12 3/1/12 1/2/12

MAKE UP OIL .75 2 0 2.5 2.5 0 0



ALUMINUM 2 2 3 2 2 2 2

CHROMIUM 0 0 1 0 1 0 0

IRON 15 16 17 14 16 11 9

COPPER 4 4 6 3 4 2 2

LEAD 3 2 3 2 2 1 2

TIN 3 0 0 0 1 0 2

MOLYBDENUM 1 1 2 0 6 7 8

NICKEL 0 1 1 0 1 0 1

MANGANESE 0 0 0 0 0 0 0

SILVER 0 0 0 0 0 0 0

TITANIUM 0 0 0 0 0 0 0

POTASSIUM 3 7 0 4 4 0 0

BORON 2 7 5 2 10 9 10

SILICON 6 7 8 9 8 7 7

SODIUM 5 5 6 5 6 5 5

CALCIUM 3744 3729 4140 3888 3604 3153 3334

MAGNESIUM 12 19 33 31 197 213 234

PHOSPHORUS 1137 1145 1401 1252 1262 1132 1241

ZINC 1338 1384 1474 1500 1323 1226 1369

BARIUM 0 1 0 0 0 0 0

CADMIUM 0

VANADIUM 0

ANTIMONY 0

LITHIUM 0



SUS @ 210F 79.9 72.6 73.2 74.6 73.0 71.3

Visc @ 100C 15.5 13.63 13.8 14.6 14.14 13.73 13.29

Flashpoint 445 450 430 430 425 435

Fuel %
Antifreeze % 0.0 0.0 0.0 0.0 0.0 0.0

Water % 0.0 0.0 0.0
Insolubles % 0.3 0.3 0.3 0.3 0.2 0.2

TBN 7.6 6.9 4.5 7.0 5.8 8.7

Soot
Oxidation 53

Nitration 10


Blackstone Comments:
Leaving the oil in place for a year or longer isn't a problem in modern automotive engines. The oil doesn't go bad and it only accumulates metal with use, so feel free to go by miles or hours instead of the calendar. You've had this oil in place for 12,406 miles so far, and your metals are basically the same as last time after 20K+ miles. That's great! If you do take this oil out to 20K miles, iron may go up a little, and that's fine. the viscosity was thick for a 15W/40, but only barely so. It's not a major concern. The TBN was nice and strong at 7.6, so add 5K miles.

22K sample on 6.13 was done through Oil Analyzers Inc, everything else is through Blackstone.

 

[dnewton3]

Typical boring Dmax UOA. Nothing ever changes and that a good thing!


Your significant driving pattern change really did little to alter wear. A tiny shift, but until you would get several UOAs you can't even really know. Macro data shows that this is completely normal and your engine is totally fine.


I leave my oil in my Dmax for 3-year cycles (as well as my Kubota and Scag). Never an issue with any contamination or degradation of the lube or filter. Probably can go further than 3 years, but the rust on the outside of the filter made me a tad nervous this last time. But upon dissection of the filter, it was totally fine inside and could have easily gone longer. 5 years might be "iffy", but 3 years is totally in sight in terms of the calendar. So with your new lower mileage trips, you may hit a calendar limit before a mileage limit. Nothing wrong with experimenting, but you might as well try to maximize the ROI given that you're running Amsoil.


You'd better be careful; you might wear that engine out by the turn of the next century