Need oil recommendations for the 5.3L. Manual calls for 5w30 but going through the last owner's maintenance records shows the shop he was using was filling it with 5w20(???). I recently stepped up to 5w30 like the manual says. I have heard others with this engine like 5w40.
Some background on the truck:
Low mileage. AFM is disabled with a Range device. Still have the HW :-( I am the 3rd owner. Truck runs strong and sounds great. I don't tow anything right now and from what I understand the previous owner did pretty light towing (motorcycles). Just did a recent tune up (plugs/wires/airfilter) and flushed the brakes and PS (dark brown). Need to flush the coolant next (probably original but still orange). Tranny was flushed at 50k and a new control module added (to fix a shifting issue). I changed the oil to some 5w30 syn from costco w/ a microgard filter that I had in the garage - seemed better than whatever was in there before (dark). Doesn't seem to consume any oil but time will tell.
Some background on the truck:
Low mileage. AFM is disabled with a Range device. Still have the HW :-( I am the 3rd owner. Truck runs strong and sounds great. I don't tow anything right now and from what I understand the previous owner did pretty light towing (motorcycles). Just did a recent tune up (plugs/wires/airfilter) and flushed the brakes and PS (dark brown). Need to flush the coolant next (probably original but still orange). Tranny was flushed at 50k and a new control module added (to fix a shifting issue). I changed the oil to some 5w30 syn from costco w/ a microgard filter that I had in the garage - seemed better than whatever was in there before (dark). Doesn't seem to consume any oil but time will tell.