Question about 2003 Audi A4 Cabriolet

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Engine is using 1/2 qt of oil every 800mi, 1.8T '04 Cabriolet

Engine is using 1/2 qt of oil every 800mi, no signs of leaking, no blue smoke out of exhaust, cylanders 2,3 & 4 show signs of fouling- Mechanic says turbo?

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Your mechanic is spot on. The A4's are notorious for turbo overheating and failure. The oil burn is coming in the TURBO itself and then being distributed to 2.3.4 as a side effect. Your not noticing blue smoke because your catalytic converter is doing its job and the minor smoke being generated is being taken care of in the CAT. If you continue to drive as is you will run a certain risk of catalytic converter damage, cylinder damage from fouling (cylinder wash) build up, sludge, etc. If your mechanic has the knowledge on this specifc model there is a way to test the turbo output and turbo heat generation to absolutely confirm. One last thing. in ANY turbo car its imperative to run QUALITY oils not your local wal-mart brand or no name. Many people are not familiar with the demands on a TURBO engine and oil change facilities pull standard oil from 55 gallon drums via a pump.. so you arent feeding your car properly. The AVG (Audi/Volkswagen) company recommends FULL SYNTHETIC and either Castrol or Mobil 1. I have a Turbo Diesel and use Mobil1 as my choice. The recommended oil for your car via their web page is Current Vehicle: Year: Engine is using 1/2 qt of oil every 800mi, 1.8T '0 - spacer.gif 2003 Make: spacer.gif Audi Model: spacer.gif A4 Quattro Engine Type: spacer.gif 4cyl. 1.8Liter Turbochargedbutton_viewprintable.gif spacer.gif Mobil 1 0W-40
A fully synthetic motor oil, Mobil 1 0W-40 with SuperSyn Technology exceeds industry standards and the major leading builder requirements, enabling the product to keep performing well after conventional oils cannot. Mobil 1 is recommended by leading car manufacturers as initial fill

Posted on Jun 06, 2010

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That amount of oil consumption is normal on an old (over 150k mi) engine.
On an old Audi engine the first thing to go is the turbo so your mechanic is probably correct. Simple way to check that: the turbo is located next to the cyl 4, look at its sparkplug, it should be the foulest.
Turbos can be refurbished, you don't need to buy a new one.

Posted on Jun 06, 2010

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