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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...

The oil loss is minor, .5 to .75 quarts during 3500-4000 mile OCIs. I check the oil once a week so I monitor it closely and top off as needed. I'm not worried about the leak really, but got into the habit of using high-mileage oils on my previous 3800-III, started at 100,000 miles. which got up...

Why the Euro L over a High Mileage option?

I was looking at that since it has the Dexos certification and most high mileage oils, including PPHM, don't have it. Not that Dexos is necessary for a 3800, but it is a marker of quality to look for.

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...

2005 Buick LaCrosse CXL 3800 Series III Mileage: 160970 Miles on Oil: 3689 Out: Frankenbrew 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 Euro L 5w30 SN ACDelco PF47E Used .5...

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...

I seldom go beyond 4,000 and usually not beyond 3500, so the TBN was OK for me. I'm running a Frankenblend right now. After that it will be PPHM most likely, or maybe PP Euro L.

I just had a pretty solid UOA for Pennzoil Platinum 5w30. Most importantly, it kept its viscosity and did not shear down to 5w20, unlike the STP full synthetic I used last time...

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...

UOAs

Yeah, I was cleaning out odds-and-ends. They are all Shell products so I'm not too worried about compatibility, especially since I won't go past 3500 miles or so on this fill. After this I am likely switching to Pennzoil Platinum HM 10w-30 in the summer and PPHM 5w-30 in the winter. The last...

I've been using various flavors of Pennzoil since 1983. Never had any problem with sludge or other complaints people used to have. I've switched brands occasionally for a sale but I'd say I've used Pennzoil 80 percent of the time.

2005 Buick LaCrosse CXL 3800 Series III Miles: 157181 Oil Change Interval: 3921 Out: Pennzoil Platinum 5w30, AC Delco PF47E In: FrankenBrew: 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...

2010 Ford Escape OUT: Pennzoil High Mileage, Motorcraft 910S filter. IN: Pennzoil Platinum High Mileage, Pennzoil PZ-21 filter Mileage on vehicle: 198898 Miles since change: 1697 Very short interval, but the OLM has been telling me to change it since last week. Not sure why, but it has been...

2005 Buick LaCrosse CXL with the 3800 got up to 208,000 before it was totaled in a wreck. It had nagging electrical issues but the engine and transmission were original and going strong, plus no rust to speak of. Changed the oil every 4-5K, usually Pennzoil High Mileage 5w30 but occasionally...

So going through the odds and ends in my garage, stuff I had leftover from my old car, my next oil change will be 1 qt Pennzoil Platinum HM 10w30 SP 1 qt Pennzoil Platinum HM 5w30 SN 1 qt Pennzoil Platinum 5w30 SP Dex1G3 1 qt Quaker State Full Synthetic 10w30 SP That leaves me .5 quarts...

I was considering the Pennzoil Platinum Euro L 5w30 for summer but I don't know much about Euro oils or how well it would match with a 17-year-old 3800 engine. I was also considering Pennzoil Platinum High Mileage given the good results this gave me in my previous LaCrosse, but this one isn't a...

I'm not sure, the shocks and struts work was done by the used car dealer before I bought my car. My mechanic checked it and said the work had been done correctly, which was my main concern given the dealer's sloppiness with not changing the old oil filter and leaving in the stale coolant, but...