This UOA was the unusual combination of 4 QTS of RLI's 10W30HD and 2 QTS RLI's 0W30 PCMO motor oils. These oils where left over from previous Renewable Lubricant oil purchases. Both Renewable and TD did not recommend these oils to be combined for HDEO purposes but blessed their compatibility to be used as PCMO. (Renewable Lubricants does not recommend their oils to be mixed across viscosities or types as one would expect.)
This oil was in service for almost a year of 50/50 So. California city and highway driving while using Purolator PureONE oil and air filters. This engine with 52K miles had both Seafoam (midway) and GM Top Engine Cleaner (end) intake application treatments during this eleven month OCI. This vehicle is driven in a normal manner with the dip stick reading a half quart low with no makeup oil added.
Previous OCI where (left to right):
1). RLI 0W30 PureOne oil filter
2). GC with 6oz. LC 20 PureOne oil filter
3). GC with 6oz. VSOT EaO64 oil filter
4). GC with 6oz. VSOT EaO64 oil filter
This oil was in service for almost a year of 50/50 So. California city and highway driving while using Purolator PureONE oil and air filters. This engine with 52K miles had both Seafoam (midway) and GM Top Engine Cleaner (end) intake application treatments during this eleven month OCI. This vehicle is driven in a normal manner with the dip stick reading a half quart low with no makeup oil added.
Previous OCI where (left to right):
1). RLI 0W30 PureOne oil filter
2). GC with 6oz. LC 20 PureOne oil filter
3). GC with 6oz. VSOT EaO64 oil filter
4). GC with 6oz. VSOT EaO64 oil filter