I have an older GMC 2500 PU with the 5.7 TB engine. The mileage is unknown. I bought the truck a couple of years ago with the counter not working and from what I can tell, it has not been working for many years. The overall condition of the vehicle would indicate that the mileage is not "very high"
Truck starts and runs strong - uses about a qt of oil between oil changes of 3K miles.
Truck does have some fairly loud piston slap (at least that is why I think it is) upon start up. More when cold, but it is also there when starting warm. It runs quiet after that.
When engine is warm, especially after towing a trailer, low oil pressure light will sometimes come on when idling in gear (i.e. at a traffic light) and it will sometimes want to stall.
Considering the fact that the truck does not smoke, burns oil modestly and pulls strongly, I have a hard time imagining that the engine is worn out.
I have been using the prescribed 5W30 vicosity and for the last couple of oil changes 5W40 - with no noticeable difference one way or the other.
Hoping some of you expert BITOG'ers will be able to give me some pointers as to what might be going on.
Finally - I have a gallon of Valvoline MaxLife 10W40 sitting on the shelf. Would that be ok in my truck?
Thanks!
Truck starts and runs strong - uses about a qt of oil between oil changes of 3K miles.
Truck does have some fairly loud piston slap (at least that is why I think it is) upon start up. More when cold, but it is also there when starting warm. It runs quiet after that.
When engine is warm, especially after towing a trailer, low oil pressure light will sometimes come on when idling in gear (i.e. at a traffic light) and it will sometimes want to stall.
Considering the fact that the truck does not smoke, burns oil modestly and pulls strongly, I have a hard time imagining that the engine is worn out.
I have been using the prescribed 5W30 vicosity and for the last couple of oil changes 5W40 - with no noticeable difference one way or the other.
Hoping some of you expert BITOG'ers will be able to give me some pointers as to what might be going on.
Finally - I have a gallon of Valvoline MaxLife 10W40 sitting on the shelf. Would that be ok in my truck?
Thanks!