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A6 4.2 - Rough idle and ticking noise

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Old 11-23-2005, 04:29 AM
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Default A6 4.2 - Rough idle and ticking noise

Anyone experienced this? Dealer says the car was low on oil. However, I checked the oil last week and it was fine. Any thoughts?
Old 11-23-2005, 04:46 AM
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Default What weight oil are you using?

Does the idle float up and down, Dip when in Drive or when the AC comes on?

Drainback oil filter?
Old 11-23-2005, 04:53 AM
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Default Re: What weight oil are you using?

The idle is quite stabile, but it kind of floats a little bit up and down. What you are describing about putting the car in drive or activating the ac sounds about right.

I have no idea what kind of oil is in there. I just purchased it, and it came with fresh oil. What weight should I be using?
Old 11-23-2005, 05:45 AM
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4.2 calls for 5W40
Old 11-23-2005, 03:27 PM
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Default Re: What weight oil are you using?

Sorry ti hijack this thread, but I have a UK 2.4ltr A6 and my idle does dip when the air-cons activaed, when put in drive and to be honest when I activate anything electrical.
The initial start-up idde can also be erratic.
The cars done this since I bought it 6-months ago so I've lived with it, but I'd love to know if there's a cure.
Old 11-25-2005, 07:00 PM
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Hmm, my manual says factory fill (S6) is 0W30 but 5W30 or 5W40 ACEA is OK
Old 10-27-2022, 12:53 PM
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[QUOTE=fusilier;15175758]Does the idle float up and down, Dip when in Drive or when the AC comes on?

Hi i have this exactly, is it a solution for it ? Or it is normal but idle is rough
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