donjetman
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I do extended oil changes and used oil analysis is so we might all learn something, and I find it interesting.
I'm trying to figure out how long I can/should go between oil & filter changes with our 140k new to us 07 Yukon Denali w/6.2 L92? The main tool I use to help me determine this is used oil analysis(UOA).
I've been doing UOA for 10 yrs on various vehicles. Here's a link to one of our vehicles that I've had for 10 yrs and have done 10 UOA to:
https://www.bobistheoilguy.com/foru...-14-500-miles-toy-fj-cruiser-4-0l#Post4918507
We bought this Yukon last Oct. w/130k miles off a used car lot without any mx history. I figured out real quick that it burned and leaked a lot of oil. It had good oil pressure and drove like a dream. I am a DIYer. I fixed the leaks by changing the rear main seal and oil pan gasket. I cured the oil burning by installing the new improved driver side valve cover and performing TSB 10-06-01-008M. I made a lot of posts here w/pics last Nov & Dec when I was doing all this work. There is a lot of gunk/crud built up inside the engine from its prior life.
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
I cleaned the spark plugs, installed new wires, installed a catch can, and installed a remote engine oil bypass filtration setup utilizing 1 Amsoil EaBP90 spin-on filter. Before I fixed everything, the catch can was catching about 1oz of oil every 100 miles. Now it catches 1 oz every 2000 miles. I went 8000 mile without adding any oil.
Here are the results of the first UOA. The oil is Mobil Delvac 1 ESP 5-40w that is SN rated w/8000 mostly hwy miles(25% remaining) and a NAPA 47060 Platinum oil filter. I did not change the oil and filter when I took the sample. I always wait till I see the results first.
Wear Metals(ppm)
Iron - 39
Chromium - 1
Nickel - 0
Aluminum - 6
Copper - 10
Lead - 9
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Contaminant Metals(ppm)
Silicon - 31
Sodium - 31
Potassium - 3
Multi-Source Metals(ppm)
Titanium - 1
Molybdenum - 51
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 37
Additive Metals(ppm)
Magnesium - 835
Calcium - 1311
Barium - 0
Phosphorus - 980
Zinc - 1212
No Contaminants
Fluid Properties
Viscosity 100C - 13.4
Total Base # - 2.58 KOH/g
Oxidation - 40 abs/cm
Nitration - 14 abs/0.1mm
The Lab, Oil Analyzers Inc(Polaris Laboratories), suggested that I change the oil because they thought the OXIDATION was high and that the total base # and Silicon were at moderate levels. I know that the oxidation wasn't TOO high because the viscosity was still at a normal level(13.4). This oil when its new is 13.8. When oxidation is too high, the viscosity will thicken.
I changed the oil, again w/Mobil Delvac 1 ESP 40w, and the filter with Fram XG10575. The EaBP90 bypass filter was drained, replenished, and re-installed.
I plan to give her another 8000k mile run, then send in another sample.
I alway cut open my old oil filters. Here are some picks of the NAPA Platinum 47060 oil filter at this oil change. Notice all the carbon in the bottom of the pleats. I think the Mobil Delvac 1 synthetic oil is slowly cleaning things up.
View media item 27790View media item 27793View media item 27792View media item 27791
I'm trying to figure out how long I can/should go between oil & filter changes with our 140k new to us 07 Yukon Denali w/6.2 L92? The main tool I use to help me determine this is used oil analysis(UOA).
I've been doing UOA for 10 yrs on various vehicles. Here's a link to one of our vehicles that I've had for 10 yrs and have done 10 UOA to:
https://www.bobistheoilguy.com/foru...-14-500-miles-toy-fj-cruiser-4-0l#Post4918507
We bought this Yukon last Oct. w/130k miles off a used car lot without any mx history. I figured out real quick that it burned and leaked a lot of oil. It had good oil pressure and drove like a dream. I am a DIYer. I fixed the leaks by changing the rear main seal and oil pan gasket. I cured the oil burning by installing the new improved driver side valve cover and performing TSB 10-06-01-008M. I made a lot of posts here w/pics last Nov & Dec when I was doing all this work. There is a lot of gunk/crud built up inside the engine from its prior life.
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
I cleaned the spark plugs, installed new wires, installed a catch can, and installed a remote engine oil bypass filtration setup utilizing 1 Amsoil EaBP90 spin-on filter. Before I fixed everything, the catch can was catching about 1oz of oil every 100 miles. Now it catches 1 oz every 2000 miles. I went 8000 mile without adding any oil.
Here are the results of the first UOA. The oil is Mobil Delvac 1 ESP 5-40w that is SN rated w/8000 mostly hwy miles(25% remaining) and a NAPA 47060 Platinum oil filter. I did not change the oil and filter when I took the sample. I always wait till I see the results first.
Wear Metals(ppm)
Iron - 39
Chromium - 1
Nickel - 0
Aluminum - 6
Copper - 10
Lead - 9
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Contaminant Metals(ppm)
Silicon - 31
Sodium - 31
Potassium - 3
Multi-Source Metals(ppm)
Titanium - 1
Molybdenum - 51
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 37
Additive Metals(ppm)
Magnesium - 835
Calcium - 1311
Barium - 0
Phosphorus - 980
Zinc - 1212
No Contaminants
Fluid Properties
Viscosity 100C - 13.4
Total Base # - 2.58 KOH/g
Oxidation - 40 abs/cm
Nitration - 14 abs/0.1mm
The Lab, Oil Analyzers Inc(Polaris Laboratories), suggested that I change the oil because they thought the OXIDATION was high and that the total base # and Silicon were at moderate levels. I know that the oxidation wasn't TOO high because the viscosity was still at a normal level(13.4). This oil when its new is 13.8. When oxidation is too high, the viscosity will thicken.
I changed the oil, again w/Mobil Delvac 1 ESP 40w, and the filter with Fram XG10575. The EaBP90 bypass filter was drained, replenished, and re-installed.
I plan to give her another 8000k mile run, then send in another sample.
I alway cut open my old oil filters. Here are some picks of the NAPA Platinum 47060 oil filter at this oil change. Notice all the carbon in the bottom of the pleats. I think the Mobil Delvac 1 synthetic oil is slowly cleaning things up.
View media item 27790View media item 27793View media item 27792View media item 27791