Where in the world are you? If you have dpf’s (NA beginning 2006) think twice before using additives.

 

Are you saying the dealer is correct and they need to do carbon clean up? It seems clear that something screwed up the DPF, how do you protect this from happening? You seem also to say don't use any additives, why ,do they add to carbon build up? How about some helpful information for the guy and his car.

On my V6 TDI i've gone way further than 60,000 miles and no carbon issues. I use PS in every tank from the get go. I also have had 3 other TDIs with the same good results. Plus no HPFP issues that are always talked about. What are you driving?

 

I have 60,000 miles on a V10 2007 I'm driving in Boca Raton Florida which means there's no dirt on the roads the roads are flat we generally don't go very fast. The car is kept in the garage it looks brand new. But so far I've had some minor repair such as the throttle body getting stuck up worst thing I possibly done to the car is a good amount of idling waiting at the school line

 

I would use VCDS to look at soot and ash values. There is current thread above about where to find these numbers. Are you getting active regenerations? (Big cloud of white smoke behind you). You can get passive regenerations by driving at 2200 rpm for awhile on a road trip. I idle as little as possible.

 

I've had to replace the throttle body n one other part, they got all gunked up dealer says I should do a carbon clean I have about 60,000 miles on it. Does anyone agree with this?

Carbon cleaning is needed whenever you think it's warranted. You actually have to look at the intake to assess how much gunk has collected there, and decide based on that whether a cleaning is needed. The amount of stuff that collects there depends on a lot of factors, like driving habits, fuel quality and climate or average trip duration. Because of that there are no two cars that need cleaning at the same interval. Some will clog up horribly already after 30,000 miles, while others will not need a thorough cleaning for twice or three times that many miles.

You think it works good just to add an additive detergent diesel cetane booster? Any thoughts?

Additives can help by lowering the amount of soot generated, and EGR/intake cleaners sprayed right into the intake/boost hose can remove some of the accumulated gunk. Taking a car every once in a while on a longer, very intense high-speed highway trip also helps, as does doing short "italian tune" runs regularly at the end of your trips, provided the engine has already warmed up at that point. However, in the end a cleaning of the throttle body / EGR valve / intake will be still inevitable, and all the stuff previously mentioned only helps extend the period at which this will be necessary.

Btw the exhaust manifold and the turbo is also affected by carbon build-up and will also need some cleaning regularly. The bad news is, that the state of these is obviously harder to assess, because you can't take a look at them as easily, as can you at your intake and its connected parts. The good news is, that these (ie. the turbo and the exhaust manifold) usually have lower amount of deposits, because of the generally higher pressure/speed of gases flowing through them, and also because there will be no or barely any oil vapors getting into them, which otherwise increases the speed of the buildup immensely at the intake.