Diesel Help

Well, a couple months ago I got my first diesel, a 2006 Chevy 2500 Duramax HD LT. I'm absolutely loving it, and have added a few things like bumper/grille (deer are a big problem in my area), a leveling kit, tow mirrors, and completely redid the audio inside. I do have a couple questions though:

• what brand oil do you diesel guys use? She's got almost 250,000 miles.

• what air filter cleaning kits do y'all use?

• how often do y'all lube the chassis?

•how often should I add fuel conditioner?



Thanks for looking guys!
Attachment 53743

Looks like ya need some tires on it.................
Oil- Rotella T 15W40
Air Filter- K&N
Chassis Lube as often as possible.....
Fuel conditioner, more often in the winter ie; cold weather than summer.