Air filters can be a bone of contention. There's one camp (led by RR) who state its fine to use aftermarket filters and that the oil* is minimal and won't cause problems with the MAF sensor. The other camp (led by TT) who state that aftermarket filters are pants and that the oil will screw up the engine.
*aftermarket filters are a bit like very fine sponges/foam but use a light spraying of oil to trap debris so you keep the same filter but wash it every so often. OEM filters are paper-based and don't use oil. Just chuck and change every 40k.
I'll leave it up to you but a word of warning: Fitting an air filter is a complete pain in the backside and can lead to frustration and broken things if not careful. The filter is located in the engine cover which is horrendous to remove.
clicky. Note the clip holding the intake hose is a PITA to remove and I had to use self-grip pliers to help me.
Oil: 5W-30. Castrol SLX/Edge stuff is highly recommended but whatever oil you go with, make sure it's Longlife III type.
Can't remember which company makes the sparkies.