Ditto what OVM says on the fuel filter - and buying oil at Autozone.
I think I have changed my fuel filter twice - at around 35K and 74K miles .... probably could have gone longer but didn't want to chance having it ended up restricted while I was on a load - particularly during the winter when the prospect of changing it on the roadside seemed less appealing. I do carry a spare in the van and I'll probably experiment to see how long I can stretch it (50K sounds good)
My '06 has the ASSYST maintenance computer that monitors oil quality - I generally average 13K to 15K miles between oil/filter changes - and additionally I
change the oil filter only again at the halfway mark - around 7K into the oil change.
I just changed my oil day before yesterday - in the parking lot of the Husky truckstop in Mississauga, ON - at 13638 miles since the previous change.
I have a Fumoto drain valve (Thanks Turtle !) installed in place of the drainplug in the oil pan and I carry an empty 2 1/2 gallon jug that "TidyCat" cat litter came in. The Fumoto drain valve has a nipple on it that I attach a short section of clear hose (included with the drain valve) to and run into the jug. Pull up the lever on the Fumoto and turn it a 1/4 turn and the oil drains out. Unscrew the oil filter cap (3/8" ratchet, extension, and filter wrench) and pull the old oil filter cartridge and change it out.
Turn the lever on the Fumoto another 1/4 turn to close it back up and reinstall the spring hose clamp (to ensure the lever isn't ever accidently opened from being hit from some road debris) Add new oil. Elapsed time: maybe 30 or so minutes. Net cost: $53.66 plus tax (for 9 1/2 qts of Mobil 1 0W-40 and filter, including the $20 credit from Autozone)
The ASSYST system includes an air filter restriction indicator on the air filter housing - and according to the instructions in the manual
"If the red field reaches the 100% range the air filter element should be replaced as soon as possible."
Additionally the instructions in the maintenance portion of the manual, under
"Scope of Work for Maintenance Service" are as follows:
"Check degree of contamination. Air cleaner filter element renewed as necessary"
Additionally, under
"Additional Maintenance Work After .... Years"
"Every 3 Years: Air Cleaner Filter Element Renewal"
I'm at 90600 or so miles .... and the original air filter - it has
never showed any restriction on the gauge (which I check regularly) and I have checked/inspected the filter itself several times - no sign of collapsing (which would indicate restriction) and not terribly dirty. (I'll probably go ahead and change it out at around 100K.)
Here's some data on why you don't necessarily need to change an air filter every 10,000, 25,000, or even 50,000 miles:
Myth vs. Fact
Frenquently Asked Questions
