250,000 is about average.
They could be, but you are near the average lifespan.
7 quarts
2012 Ram 1500 wheels will fit on a 2003 .
6 quarts 5w30
.040 inch
Timing chains normally last the life of the engine and are replaced when the engine is rebuilt.
NoNo
About 6 quarts/5.5 liters.
It depends on the year. from 2003 to about 2005 they used 5w30. After that they used 5w20.
There are sensors all over the engine, transmission, exhaust, axles, etc.
No.
The 2003 GMC Sierra-1500 has a V6 engine.