07 Yukon Denali w/6.2L all aluminum 400 hp engine w/VVT non-AFM. It weighs about 6000 Lb. I drive it easy and it see's mostly hwy miles. Bottom line is "it is hard on oil". It had 157k miles at last oil change. It never needs any make up oil between oil changes. I use nothing but high quality synthetic name brand oil. I do UOA before every oil change and wait to see the results before making the decision to change it or let is go for a little while longer.
Sump capacity was 7 qts for the following:
8100 miles - 25% remaining
6200 miles - 50% remaining
7800 miles - 35% remaining
8600 miles - 25% remaining
UOA results indicate "for me" that the OLM should indicate 0% remaining at 7k miles, or stated another way, 1k miles per each 1 qt of oil sump capacity.
So I added 4 more qts to its sump capacity, an oil cooler, and reduced the thermostat temp from 195* to 185*. Total sump capacity is now 11 qts. I think "now" my OLM will be accurate.
Soon I'll have about 11k miles and 1 yr on the current load of oil(Mobil Delvac 1 ESP 5w30). The OLM will be near 0%. I'll send in a sample for UOA and post the results on BITOG.
Sump capacity was 7 qts for the following:
8100 miles - 25% remaining
6200 miles - 50% remaining
7800 miles - 35% remaining
8600 miles - 25% remaining
UOA results indicate "for me" that the OLM should indicate 0% remaining at 7k miles, or stated another way, 1k miles per each 1 qt of oil sump capacity.
So I added 4 more qts to its sump capacity, an oil cooler, and reduced the thermostat temp from 195* to 185*. Total sump capacity is now 11 qts. I think "now" my OLM will be accurate.
Soon I'll have about 11k miles and 1 yr on the current load of oil(Mobil Delvac 1 ESP 5w30). The OLM will be near 0%. I'll send in a sample for UOA and post the results on BITOG.