The Oil you want to use is 15W-40, if your truck is higher mileage I use Amsoil's Heavy truck/ Marine 15W40
It is the round canister in the rear center of the engine, at the firewall.
The heater fan relay for a 1993 Silverado 4x4 6.5 turbo diesel can be found using the engine diagram. The engine diagram will be provided by the car manufacturer upon inquiry.
4l80e
That should be a 4L80E transmission.
The fuel filter, on your 1993 Chevy 6.5 liter diesel engine, can be removed by turning the fuel filter to the left. The fuel filter will come off and can be replaced with a new filter.
Yes they will as long as the 99 is not the new body style.
In the oil pan
No such part on a 1993 Cummins
very carefully.
You CAN"T.
It doesn't have one.
inside the distributor