Did my first DIY oil and filter change (on this car) along with two new air filters.
The air filters were likely the originals with 35K on them. Absolutely filthy, including the air boxes.
Took the 2 piece air boxes off and thoroughly hosed off/cleaned all the dirt and bug debris.
This was primarily on the air intake side of the filter housing, attached to the radiator support.
There was very little dirt that made it past the filter to the side with the hose attachment. There was some though.
Be VERY careful when cleaning out that side as the "hot-wire" airflow sensor resides there and they tend to be fragile.
I suppose one could carefully remove them and then clean the airbox.
As far as the oil and filter change, it was very straightforward.
I did refer to this before starting:
just to see if there were any potential "gotchas" in the process. Nope, easy-peasy.
Followed that how-to pretty closely, but deviated slightly in a couple spots.
I used a Fram XG (Ultra Synthetic) filter XG6607 instead of the Nissan filter as I'm not worried about warranty at this point.
The blog poster mentioned "panels left hanging down" from the quick-change oil places and sure enough, all 3 of the plastic push-pin retainers were missing from my splash panel, allowing it to sag down about 3 inches and no doubt flop at speed.
Had some miscellaneous ones laying around the garage of the correct diameter, pushed them in, no more sag.
My point with all of this is:
I'm a fairly experienced DIY wrench/gearhead, but no one that knows how to operate a ratchet wrench and properly lift and support a car should be afraid to tackle their own oil and filter change on these cars.
Save some money and have the satisfaction of knowing it's done right.