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Trouble code P0456 means: EVAP Control System Very Small Leak (0.020") Detected
7 quarts
250,000 is about average.
6 quarts 5w30
.040 inch
2012 Ram 1500 wheels will fit on a 2003 .
Timing chains normally last the life of the engine and are replaced when the engine is rebuilt.
NoNo
About 6 quarts/5.5 liters.
There are sensors all over the engine, transmission, exhaust, axles, etc.
It depends on the year. from 2003 to about 2005 they used 5w30. After that they used 5w20.
They could be, but you are near the average lifespan.