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My plan is to replace the current PP 5w30 at 3400 miles or so, or in mid-April, whichever comes first. I was considering a frankenblend of some odds/ends PP 5w30 and Quaker State 5w30 I have lying around. But I could also try something else. In my old LaCrosse I had excellent results with...

What could be causing the shear? I am just learning to understand this stuff and was under the impression that the 3800 was usually gentle on oil.

Here is the UOA for my 2005 Buick LaCrosse CXL with the 3800 Series III engine. Oil: STP Full Synthetic, 5w30 OCI: 3204 miles Engine miles: 153,260 I acquired this car in July to replace my previous '05 LaCrosse which had been totaled in an accident. This is my first UOA to check the health of...

Would anyone hesitate to do a 50-50 Frankenblend of Quaker State 5w30 full synthetic and Pennzoil Platinum 5w30?

"Conventional" Pennzoil HM, which is a synthetic blend I think. My plan is to change the oil again in April once the weather warms up again, which should be about 4000 miles or so. I can't do my own oil changes, not having the space, but fortunately the local quick lube place has a good...

My first UOA. This is my wife's 2010 Ford Escape with the 2.5 Duratec 4-cylinder. It has been losing coolant slowly for no reason that I can determine, so I was concerned about coolant in the oil. None of that showed up, so that's good. The oil was Pennzoil High Mileage 5w-20 with a Service...

2005 Buick LaCrosse CXL 3800 Series III 153260 engine miles Oil Change Interval: 3228 miles Oil Life Monitor: 65% Out: STP Full Synthetic 5w30, Carquest premium oil filter 85040 In: Pennzoil Platinum 5w30, AC Delco PF47E filter. OCI was conservative because I bought this car over the summer...

5qt jug of Pennzoil Platinum 5w30 AC Delco PF47E filter Destined for my 05 LaCrosse CXL when the current STP FS 5w30 fill crosses the 3000 mile mark next week. The car took a 900 mile road trip recently and the oil looks considerably dirtier than it did before the trip. This car is new to me...

2010 Ford Escape XLT, 2.5 engine, my wife's vehicle, 197,201 miles. Out: Pennzoil High Mileage 5W-20, Service Champ OF241 Filter. Oil had just 3,400 miles on it but it was all stop-and-go driving in the heat of summer and the fill was six months ago. In: Pennzoil High Mileage 5W-20, Motorcraft...

2005 Buick LaCrosse CXL 3800 Series III engine, 152,000 miles. I just purchased this car to replace another '05 LaCrosse that was totaled in an accident. Out: Unknown oil, very old AC Delco P47E; the oil itself did not look too dirty but the filter has been on there a long time. In: STP Full...