being driven on the highway for awhile. Once it starts the noise is constant and very loud, and it is worse when accelerating. The noise will continue until the car is shut down for an hour or so. There is very little lifter noise on startup and that goes away immediately. When the car is only driven in town, the noise never appears even if the car is driven for a long time.
It is so loud that whenever we come back to town after driving on the highway, I don't like driving anywhere with it until we can get it home and shut down for awhile. It is very embarrassing - maybe I should get a "diesel" emblem put on the car.
I had been using Mobil 1 10w-30 and recently changed it to 15w-50. That seemed to lessen the noise, but it is still there.
Any thoughts or suggestions as to what I need to do?
Thanks,
Dick Schneiders