Originally Posted By: Bill in Utah
Originally Posted By: BuickGN
I would trust the syn 30wt a lot more if there is a fuel dilution issue, engine overheating, if the car is run hard, etc. My girlfriend drives my TL a lot more than I like and I know if something ever went wrong such as the engine overheating, she is not going to pull over and I have given up on teaching her so the synthetic gives me peace of mind on my near $40K car.
This last week, my sister had a water pump die while she was going down the road. The water temp shot up and the engine got so hot it actually shut down when she finally pulled over to a point she felt was safe.
Hot day, loaded up 200k plus Grand Caravan with kids and her oil? Pennzoil 5w-30 conventional with about 3500 miles on the OCI.
Replaced the water pump and lucky the heads did not warp
and she is on the road with no problems.
If you are buying syn because you think it will protect the engine to a issue like my sister had, you are kidding your self.
No oil is going to prevent a head or block from warping if it is going to warp.
And if you have a fuel problem, the only thing that will protect the engine is changing the oil. Any oil with lots of fuel is not a good protector.
Take care, Bill
BTW: your girlfriend gets the engine hot enough, she will have no choice to pull over and the ECM will kill the motor. If a per OBDII motor does it, I'll bet large amounts of $$ (out of state of course (after all I do live in Utah
) that OBD II will protect the emissions.
I'm glad it turned out ok for her. Going by your posts there's no reason to run synthetic ever unless it's for 20,000 mile intervals which I don't agree with.