..on my 1997 GM 4.3.
This isn't very scientific, but I found it interesting nonetheless. Both filters are AC Delco PF52's and were ran for about the same time and mileage. 1 week and ~350 miles. Certified conventional 10w30 was used both times.
Let me start by saying my LIM gaskets were leaking since I bought the truck back in March. I knew the job needed done, but they never leaked enough to require a coolant top off or visually contaminate the oil in my 7k of ownership. The job took me a few days, but I took my time and had to work around weather. Not a bad job really and it certainly won't keep me from buying another one.
This was ran right after the LIM replacement. I used shop towels and a shop vac in effort to keep gunk out of the engine, but obviously it was still allowed to get in somehow. I felt better with doing the 1 week runs of oil because a bit of coolant was collecting in the engine as well.
This is the second run of my PF52 and Certified oil combo. Much cleaner. The oil in the can looks cleaner and brighter, but I think that's the difference in lighting. One photo was taken in a garage with florescent lamps and another was taken outside.
Right now, it has a frankenbrew of Certified, Delo 15w30 and QSUD with a Microgard filter. I'll run that a while then go to synthetic something.
This isn't very scientific, but I found it interesting nonetheless. Both filters are AC Delco PF52's and were ran for about the same time and mileage. 1 week and ~350 miles. Certified conventional 10w30 was used both times.
Let me start by saying my LIM gaskets were leaking since I bought the truck back in March. I knew the job needed done, but they never leaked enough to require a coolant top off or visually contaminate the oil in my 7k of ownership. The job took me a few days, but I took my time and had to work around weather. Not a bad job really and it certainly won't keep me from buying another one.
This was ran right after the LIM replacement. I used shop towels and a shop vac in effort to keep gunk out of the engine, but obviously it was still allowed to get in somehow. I felt better with doing the 1 week runs of oil because a bit of coolant was collecting in the engine as well.
This is the second run of my PF52 and Certified oil combo. Much cleaner. The oil in the can looks cleaner and brighter, but I think that's the difference in lighting. One photo was taken in a garage with florescent lamps and another was taken outside.
Right now, it has a frankenbrew of Certified, Delo 15w30 and QSUD with a Microgard filter. I'll run that a while then go to synthetic something.