I have a 91 Pontiac Trasnport running on 10W 30 synthetic oil. It is the Mobil that doesn't need changing untill 13,000 miles? I do it sooner.
Experiencing a 'lifter' pinging noise, so mechanic says to try 5W 30. I did, and noise stopped.
Now, need to change oil as it is 'time', and am in a quandry. Ex says to put in 10W 30 because of:
amt of miles (220,000)
weather in da UP of michigan is COLD
and 'it needs heavier oil in winter.'
I have no idea, and am trying to learn about all this oil stuff so I can 'hold my own'...as they say....
Manual says 5w 30, but doesn't take in consideration of high mileage, and weather conditions.
Maybe I should just keep praying it dies, but for 250.00 it just keeps runnning, and running..........for the past three years! hmpf.