audi_a6_55

Recently my a6 with 77k km does weird vibration in 4th and 5th gear when it is betweewn 1500-3000 rpm. The car vibration is very noticeble. This happens only if the car is driven more that 60-70 km. I recently did a oli change at 16k interval before ( i did oil sercive myself) . Car oil service was done at 16-22k each time so i think the engine is in good shape. The weird part is that if I let the throttle standy it doesnt do it so badly or when it is downhill. I think it might be the thorttle body clamp or fuel system management. Can anyone help me ?

JohnnyJ

Manual or auto?

audi_a6_55

In manual it is less noticeble but it still does it.

JohnnyJ

Ok, I assume you have an automatic gearbox (S-Tronic) and not a manual. Did you change the oil filter in the gearbox when you changed the oil in it?

John Simcox

All C8s are auto, mostly with the 7 speed DSG box and a few with the 8 speed Tiptronic box

audi_a6_55

I did when Audi states that the ATF fluid change is at 60000km i did it at 60600km

JohnnyJ

Did what? Please elaborate fully what you have changed!

audi_a6_55

Gearbox oil change 60600km
Engine oil change 16000- 38000- 60600- 77000 km
Spark plugs change 60600 km

JohnnyJ

So, no gearbox filter change! That might be the problem. Consult a trusted dealer for proper analysis!