Here is the recent UOA for an '05 Cobalt with 290,500 miles. Oil used was Pennzoil HM 5W30, and top off oil (1 qt) was Pennzoil 5W30. Pennzoil has been used for the past few changes. The sodium level caught my eye as being high, but it is possible that some Valvoline was used to top it off at some point during the interval.
Lab used was ALS.
Code:
Oil Pennzoil HM 5W30
Miles in Use 5,542
Miles on Engine 290,500
Date 11/21/15
Iron 8
Copper 4
Tin 2
Aluminum 4
Silicon 8
Sodium 160
Potassium 7
Magnesium 7
Calcium 2400
Phosphorus 751
Zinc 893
Molybdenum 227
Boron 51
Water
Coolant No
cSt 100C 10.5
TBN 4.1
Lab used was ALS.
Code:
Oil Pennzoil HM 5W30
Miles in Use 5,542
Miles on Engine 290,500
Date 11/21/15
Iron 8
Copper 4
Tin 2
Aluminum 4
Silicon 8
Sodium 160
Potassium 7
Magnesium 7
Calcium 2400
Phosphorus 751
Zinc 893
Molybdenum 227
Boron 51
Water
Coolant No
cSt 100C 10.5
TBN 4.1
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