A while back I posted the averages after 400,000 miles of oil samples on one of my Duramax engines. That engine has now gone 100,000 plus more miles all on CK4. Below is a Summary and the actual data.
Did anything change about the truck? Yes, it does more short trips now vs the constant long haul it used to do, annual mileage is 1/3 - half of what it used to be. There was a Wix filter test but it was equally spaced between the 2 oils (we went back to Fleetguard).
Oils were Chevron Delo LE 5W40 syn CJ4 and then the switch to Chevron Delo XPS 5W40 syn CK4. OCI's are 20,000 miles for both oils.
The basic used oil chemistry changed as follows,
Item CJ4 - CK4
Zinc 1296- 890
Phos 1083- 795
Moly 47- 3
Calcium 913- 1436
The rest were pretty much the same.
Wear and Condition numbers,
Item CJ4- CK4
Iron 16.72- 15.25
Lead 2 - 5.5 (I'm attributing most of this to engine age and the shorter trips/stop start increase)
Copper 12.64- 1 ( The CJ4 oil samples have the original new engine oil cooler lechate so no big deal)
TAN 4.10- 2.97
TBN 6.54- 4.26
Oxidation 15.52- 13.75
Nitration 10.72- 9.75
Viscosity 13.87- 14.98
Two reports below, First is CJ4 and the second (1) is CK4.
Did anything change about the truck? Yes, it does more short trips now vs the constant long haul it used to do, annual mileage is 1/3 - half of what it used to be. There was a Wix filter test but it was equally spaced between the 2 oils (we went back to Fleetguard).
Oils were Chevron Delo LE 5W40 syn CJ4 and then the switch to Chevron Delo XPS 5W40 syn CK4. OCI's are 20,000 miles for both oils.
The basic used oil chemistry changed as follows,
Item CJ4 - CK4
Zinc 1296- 890
Phos 1083- 795
Moly 47- 3
Calcium 913- 1436
The rest were pretty much the same.
Wear and Condition numbers,
Item CJ4- CK4
Iron 16.72- 15.25
Lead 2 - 5.5 (I'm attributing most of this to engine age and the shorter trips/stop start increase)
Copper 12.64- 1 ( The CJ4 oil samples have the original new engine oil cooler lechate so no big deal)
TAN 4.10- 2.97
TBN 6.54- 4.26
Oxidation 15.52- 13.75
Nitration 10.72- 9.75
Viscosity 13.87- 14.98
Two reports below, First is CJ4 and the second (1) is CK4.
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