- Joined
- Sep 8, 2022
- Messages
- 44
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 the engine and establish a baseline. My goal is to get another 100,000 miles out of this vehicle.
Known History of the car: This car was built in January of 2005. According to Carfax, In March of 2005 it was sold to a person in a small town in Texas. This person owned the car from March 2005 through January 2020. and put about 122,000 miles on the car, averaging just under 9,000 miles a year. According to Carfax, the oil was changed every 4,000 miles at the local small town GM dealer, with other services performed according to manufacturer specifications at 50,000 and 100,000 miles.
According to maintenance records in the glovebox, the car suffered an overheating incident in August 2010, requiring a new water pump, coolant elbows, and intake manifold gasket replacement/upgrade performed at the dealer. Otherwise this appears to be the only significant repair other than normal wear/tear items like brakes.
The first owner traded the car back to the original dealer in January 2020. The car was then sold to a used car dealer in Independence, Missouri in February 2020, who then sold it to the second owner in June 2020.
The second owner kept the car from June 2020 through December 2021 and somehow put about 30,000 miles on the car in 18 months. There is no record on Carfax or in the glovebox of any maintenance being performed by the second owner.
In December 2021 the car was repossessed by the bank.
In April 2022 the car was auctioned to a used car dealer in Kansas City, Kansas. This dealer performed several repairs including new tires, new brakes, new shocks and struts, refreshing the transmission fluid, a new oil pan and pan gasket, and an oil change.
I purchased the car in July after my mechanic assessed it as being in good overall condition, although in need of more repairs including CV joints and more suspension work. He also advised another oil change since although the dealer had changed the oil and it looked clean, for some reason they had left the old filter on and said filter looked VERY old. The coolant was also looked stale and my mechanic said it probably dated back to the 2010 repair. We flushed that out and replaced with new.
Anyway, given all this and the possibility that the second owner did not treat the car well, I went with a short OCI and had a UOA done.
The results look OK to me except for elevated silicon, which could be from the new oil pan and gasket. I am glad to see the absence of coolant.
I do wonder about the loss of viscosity and the fuel dilution. Is STP oil a thin 5w30? For the winter I am running Pennzoil Platinum 5w30.
The car runs VERY well, gets 20 MPG in the city and 30 on the highway.
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 the engine and establish a baseline. My goal is to get another 100,000 miles out of this vehicle.
Known History of the car: This car was built in January of 2005. According to Carfax, In March of 2005 it was sold to a person in a small town in Texas. This person owned the car from March 2005 through January 2020. and put about 122,000 miles on the car, averaging just under 9,000 miles a year. According to Carfax, the oil was changed every 4,000 miles at the local small town GM dealer, with other services performed according to manufacturer specifications at 50,000 and 100,000 miles.
According to maintenance records in the glovebox, the car suffered an overheating incident in August 2010, requiring a new water pump, coolant elbows, and intake manifold gasket replacement/upgrade performed at the dealer. Otherwise this appears to be the only significant repair other than normal wear/tear items like brakes.
The first owner traded the car back to the original dealer in January 2020. The car was then sold to a used car dealer in Independence, Missouri in February 2020, who then sold it to the second owner in June 2020.
The second owner kept the car from June 2020 through December 2021 and somehow put about 30,000 miles on the car in 18 months. There is no record on Carfax or in the glovebox of any maintenance being performed by the second owner.
In December 2021 the car was repossessed by the bank.
In April 2022 the car was auctioned to a used car dealer in Kansas City, Kansas. This dealer performed several repairs including new tires, new brakes, new shocks and struts, refreshing the transmission fluid, a new oil pan and pan gasket, and an oil change.
I purchased the car in July after my mechanic assessed it as being in good overall condition, although in need of more repairs including CV joints and more suspension work. He also advised another oil change since although the dealer had changed the oil and it looked clean, for some reason they had left the old filter on and said filter looked VERY old. The coolant was also looked stale and my mechanic said it probably dated back to the 2010 repair. We flushed that out and replaced with new.
Anyway, given all this and the possibility that the second owner did not treat the car well, I went with a short OCI and had a UOA done.
The results look OK to me except for elevated silicon, which could be from the new oil pan and gasket. I am glad to see the absence of coolant.
I do wonder about the loss of viscosity and the fuel dilution. Is STP oil a thin 5w30? For the winter I am running Pennzoil Platinum 5w30.
The car runs VERY well, gets 20 MPG in the city and 30 on the highway.
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