Not sure if this subject has been covered before, but has anyone else noticed oil consumption increases as the oil ages?
In this application and example, the oil being used is HPL - so I don't think viscosity loss is the driver. Other brands of oils have exhibited identical behavior.
It is a Subaru FB25 engine.
102,517 - Oil and Filter Change with HPL 10W20
105,217 - Add 3/4 qt of HPL 10W20
107,291 - Add 1 qt of HPL 10W20
109,051 - 3/4 qt low, Oil and Filter Change with HPL 5W30
112,479 - Add 1 qt of HPL 5W30
Basically, consumption starts out at 1 qt/3500 miles but increases to around 1 qt/2000 miles once the oil ages.
In this application and example, the oil being used is HPL - so I don't think viscosity loss is the driver. Other brands of oils have exhibited identical behavior.
It is a Subaru FB25 engine.
102,517 - Oil and Filter Change with HPL 10W20
105,217 - Add 3/4 qt of HPL 10W20
107,291 - Add 1 qt of HPL 10W20
109,051 - 3/4 qt low, Oil and Filter Change with HPL 5W30
112,479 - Add 1 qt of HPL 5W30
Basically, consumption starts out at 1 qt/3500 miles but increases to around 1 qt/2000 miles once the oil ages.