And what exactly does it do?

 

How many miles are you at?

 

124k.

 

yah "tune up" is a broad topic...first we need to know how many miles you are at so you can figure out what parts need to be tuned up or replaced. I know the G's have fluid flushes recommended, belt replacements, spark plug changes among many other things.

 

so far at 48k, Ive done all of Nissans recommended services. Change oil(duh), air filter, in cabin air filter, plugs (lil early), brake fluid and power steering fluid flushes, replacing belts shortly as well. Are your brakes working properly? Tires in good condition? wiper blades? theres all sorts of stuff we could list for "tune up"

 

replace engine oil and filter, all fluids, Lubricate all locks/ hinges, replace drive beltes, in cabin microfilter, radiator cap, wiper blades, a lot of inspecting on the vehicle. it could cost more then $700 at the dealers.

 

I'm going to assume the OP didn't mean getting the car serviced as you all explained, but rather was talking about the Osiris etc style of tune ups. Maybe I'm wrong, but servicing a car isn't what I'd really call a tune up... at least not as it's referenced on this forum. Since I know nothing about the Osiris, bulldog, etc etc programs and tunes, I can't comment on that stuff, but maybe now someone else can.

 

You're describing tuning, which is completely different from a tune up.