Oil changes I have checked my owners manual and it says oil capacity is 10 qts plus one for the filter. For several years I have been running the interstates pulling 5-12k lbs. so since I bought the truck I always followed the advise of a retired Big Rig mechanic and tried to use Rotella T 15w40 with Mopar filters every 4-5k miles. Twice I have had my oil changed at diesel repair shops and each time they put in 12 qts. I discovered this the first time I pulled the dipstick following the service and found it indicating overfull. Where have I gone wrong? Should I allow them to put in 12 qts? Could I run a little longer between changes? Changing this often is very costly? I hope I haven't hijacked this thread because my truck is a 1998.5 24v with 240k miles and I know you guys have been talking about an 06.