Latest UOA, 0w-20, 07 6.2L w/ 180+k mi

[donjetman]

Vehicle is 2007 GMC Yukon Denali w/180,435 miles, w/all alu 6.2L L92. Mods are 1) 11 qt sump; 2) small hayden oil cooler; 3) 180*f thermostat; 4) 0w-20 wt engine oil.

Here's my latest used engine oil analysis report, It a OAI value kit (#KIT14) <$17, that's why some of the #s are missing.

Oil is Amsoil ASM 0w-20, full flow oil filter Fram XG10575, bypass oil filter is Amsoil EaBP90 installed 5 mths, 6235 miles, 126 hrs ago. DIC: 51% remaining. Averaging almost 50 mph on the oil, 2/3rds hwy. This is really the "6th uoa" report we've gotten since buying it almost 4 yrs and 40k miles ago. I sent the 5th to Blackstone labs. As you may recall? a plastic heater hose t-fitting broke Dec 2019 mths before report #3 which resulted in a short overheat event. I've been trying to get the IRON back down to these levels ever since. I think Boron in a new sample is around 300.

This my first time to run 0w-?? oil in anything. I like what I'm seeing with this brand and wt of oil. Gas mileage locally (16.0mpg) and on the hwy (19.0) has increased noticeably. I'm getting 20-30 more miles per tank.

I plan to leave everything in place for at least 2k+ more miles unless someone has a good reason why I shouldn't?

What say you?

 

[intheburbs]

Why the 20 weight? For mileage? I just can't bring myself to trust sub-30 oils. I feel like it's a tradeoff, giving up durability for a slight increase in efficiency.

 

[Geotrash]

Looks good to me. Send it!

 

[donjetman]

Here are the results from Blackstone of the same sample (see post #1), Amsoil ASM 0w-20. The results from each lab are similar. These are the last 4 UOA reports since the "overheat event" (broken plastic heater hose fitting) in Dec of 2019. I hand wrote in the results from March 2020 (sample #3 in the OAI results post #1). I think its plane to see that the "overheat event" took a little toll on engine and oil. I should have changed the oil immediately. Vehicle has always run great and is only down 1/2 qt in these 6235 miles.
8-22 = Amsoil ASM 0w-20 - 6,235 miles
3-22 = Kirkland 5w-30 - 6,400 miles
3-21 = Mobil Delvac1 ESP 5w-30 - 10,200 miles
3-20 = Mobil Delvac 1 ESP 5w-40 - 8,600 miles

What say you?

 

[Geotrash]

Here are the results from Blackstone of the same sample (see post #1), Amsoil ASM 0w-20. The results from each lab are similar. These are the last 4 UOA reports since the "overheat event" (broken plastic heater hose fitting) in Dec of 2019. I hand wrote in the results from March 2020 (sample #3 in the OAI results post #1). I think its plane to see that the "overheat event" took a little toll on engine and oil. I should have changed the oil immediately. Vehicle has always run great and is only down 1/2 qt in these 6235 miles.
8-22 = Amsoil ASM 0w-20 - 6,235 miles
3-22 = Kirkland 5w-30 - 6,400 miles
3-21 = Mobil Delvac1 ESP 5w-30 - 10,200 miles
3-20 = Mobil Delvac 1 ESP 5w-40 - 8,600 miles

What say you?View attachment 380063

Blackstone always provides really helpful commentary. They're the only ones I'll use for my airplane.

 

[Dustin Jackson]

@donjetman Very interesting read, thank you