I have a used 2001 audi a6 2.8 bought at 48000 miles and currenty has 54000 miles and hasnt had spark plugs changed yet when and what do i tell the mechanics have done when i make a visit...

check for sure the batt and charging.that can cause lots off problem.
weak batt gifs weak spark charge chould be round 14.7 not 14.9
that toomuch also not good.check sparkplug wires and rotor,if needed,
to replace use original parts.check also pipes off the turbo.

Have you try swapping components such as plugs, coils, with another cylinder to see if the problem follows with the swap? Make sure plug isn't cracked or carbon tracking. How about a compression check, injector pulse? Injector pulse will determine if the circuit is open or if the computer just can't command that injector open.

If it was a coil it would read "service engine" after about two weeks of driving. I would replace the motor mounts.

Generally, spark plugs used in cars today are supposed to last up to 100k. Most experts recommend replacing the plugs and fuel filter every 35,000 to 50,000 miles. The timing belt and serpentine belt should have been replaced at 75,000 miles and the transmission fluid should have be serviced by now.

if vechicle getting spark and fuel.timing could be off due to a worn timing belt.i would do a compression test see what condition the engine is in.

Yes at 100,000 miles

You need to change trans fluid on all vehicles every 30,000 miles or two years.
Same on power steering fluid.
Spark plugs every 50 to 60,000 miles or three years
Brake fluid every year,not more than two


There haven't been Tune-ups in 25 years --everything is done with computer/processors

That is called Preventative Maintainance

i recommend to replace the spark plugs and the spark plug wires (it is always recommended to replace both at the same time) it is also a good idea to replace the air filter and fuel filter if this hasnt been done long time or if you do a lot of driving and you have done it in a while i still recommend to do so and it is a good idea at this time of the year to change the oil if it hasnt been done w/i the last 3 months or 3,000 miles which ever is first. this will fix that spark problem and improve gas mileage.

24 mpg on the highway is actually pretty good for that truck. at 48000 miles and being 3 years old its time for plugs, air filter, and fuel filter if available. thats cheap maintenance for now. but if very self conscious, run some fuel injector cleaner first, then change the plugs, because any octane booster or fuel injector cleaner can run the risk of fouling out a plug, by creating a hotter spark then what, normal gas does. the burn is hotter.

Change Plugs at 30,000 Miles or 48000 KM (I am in USA)
Plug type is:
NGK Part #2382 or #6953 which is a V groove.


Please give me a FIX YA if this info is helpful