High mileage could be your own interpretation. However I drive a 2001 Ram 5.9 with 180k miles and it runs fine, factory motor and trans. My step-dad drives an 04 Ram with 120k miles and needs a head gasket. Take care of your motor and it will treat you well.
Pennzoil High Mileage conventional oil.
The price of a 2003 Dodge Ram will vary depending on the condition and mileage of the vehicle. As an average the 2003 Dodge Ram 1500 would cost $9,196.
12-13 mpg
Assuming it has somewhat high mileage, 10W-40 is fine.
13 city 16-18 HWY
City is 14, highway is 20.
10-15
13mpg city/ 16.96mpg high way (16.96) is the best I can get out of mine, if you have a 2 wheel drive, you might do better.
Gas mileage for a 1999 Dodge Ram 1500 5.2 L is 11-12 mpg in the city and 17-18 mpg on the highway.
According to Consumer Reports the F150 models are pretty mid range compared to the Dodge Ram when it comes to safety. However, when it comes to fuel mileage the Ford 150 surpass the Dodge Ram.
10W30 or 10W40 for higher mileage
75000+