replacing air filter

[TXSUT]

You should be checking your air filter every time your change your oil, but after 50k+ miles, I'd say you are very long overdue. How often you actually replace it will depend on driving conditions. You could always get a lifetime filter like K&N (clean and re-oil at regular intervals).

Since you obviously don't know the history of your vehicle, I'd also advise getting all fluids (tranny, diffs, transfer case, coolant) changed at this time.

[SteveGt]

I bought the truck in 2004 with 20000km but I usually trust service guy at the dealership but now that I think of it I dont ever remember him once saying I needed to replace my air filter I guess I need to make a trip to the dealership this week.

[TXSUT]

Open the hood, open the airbox, and have a look at the air filter for yourself!

[pdsq99f4]

Actually take the filter out and bang it on the ground. You'll be suprised how much crap falls out of it. I agree you are long overdue. At 30K miles the H2 filters are usually pretty clogged although they "look" ok with a visual inspection.