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Vehicle: 2005 Buick LaCrosse CXL Engine: Buick 3800 Series III V6 Miles on Engine: 165,090 Miles on Oil: 4118 Oil Type: Pennzoil Platinum High Mileage 10w30. Ran 10w30 for the summer months. Viscosity was a little higher than the 5w30s that I have been using, although as Blackstone notes, it...

Here is the latest UOA for my wife's 2010 Ford Escape with 2.5L I-4. The oil was Pennzoil Platinum High Mileage 5w-20. It required no top-up oil this run. For the last two oil changes, the OLM has been extremely conservative, asking for new oil at about 2000 miles. In the past, it would not...

Vehicle: 2005 Buick LaCrosse CXL Engine: Buick 3800 Series III Miles on car: 160,970 Miles on oil: 3,689 Oil Used: Frankenblend 1 qt Pennzoil Platinum HM 10w30 SP 1 qt Pennzoil Platinum HM 5w30 SN 1 qt Pennzoil Platinum 5w30 SP 1 qt Quaker State Full Synthetic 10w30 SP .8 qt Pennzoil Platinum...

Let's be honest with ourselves: for the vast majority of vehicles, any modern oil you buy off the shelf at Wal Mart with the proper viscosity and specifications will take care of our engines just fine as long as the OCI is reasonable and the oil level is monitored. Many of us overthink this and...

I was in my local Autozone yesterday and saw something interesting: Pennzoil Platinum 5w-30 for sale...in a silver bottle, SN rated, manufactured in June 2016. It was on the shelf with the current bottles for the same excessive price as the new ones. I wonder how long they have been trying to...

Here is the most recent UOA for my 2005 Buick LaCrosse. Good report! I'm happy that the Pennzoil 5w30 did not shear down to a 5w20, unlike the last oil I ran, which was STP full synthetic. The silicon is out of the system too and no evidence of coolant. Link to previous analysis...

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?

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...