My father just purchased a used car. It is a 2002 Buick Lesabre Limited with 32,000 kms. It has been dealer maintained since new with dino oil as per the service records. The 3.8L engine calls for 10w-30 oil. I would want to switch to a synthetic oil next oil change. Good idea??? Any suggestions?
Serious. 32000 km in 7/8 years! Thats very low mileage.
I would try to find out how that car was driven. If it was driven
by some old lady at low speed/low rpm city driving then that
engine may be sludged up. I would clean that engine up first.
Use good dino oil like Pennzoil/Castrol with higher calcium
or even the GM Engine Oil Supplement and run it for 5000 km.
Note if there is oil usage. If there is, then keep doing this
for another 5000 km. Then switch to synthetic oil of your choice.