Audi Allroad Oil Leaks & Burning Oil Smells

Do you have an Audi Allroad oil leak? Does your Audi Allroad have a burning oil smell? We've noticed in our own service repair facility that the Audi Allroad V6 30 valve 2.7 liter engines can develop oil leaks as the car gets older and advanced in miles. This page endeavors to simplify the difficult task of diagnosing Audi Allroad oil leaks, especially on these engines. If you are getting ready to spend money on the repairs associated with having different seals, gaskets, and hoses replaced, please read this page addressing Audi Allroad oil leaks.

Note: Most of the photographs on this page are showing a 2.8 liter engine. However, all of the information still applies to the Allroad 2.7T 30 valve engine.

The Four Most Common Audi Allroad Oil Leaks

  • Audi Allroad Oil Leaks - Cam Chain Tensioner Gaskets and Seals
  • Audi Allroad Oil Leaks - Valve Cover Gasket Seals
  • Audi Allroad Oil Leaks - Camshaft Seals and Plugs
  • Audi Allroad Oil Leaks - Front and Rear Crankshaft Seals test

If your vehicle has in excess of 100,000 miles on it, the oil leaks may be linked to a blocked crankcase breather hose system. See our detailed and illustrated Audi Allroad Crankcase Breather Hose System article. This page explains how the Audi Allroad Crankcase Breather Hose System gets clogged and repair options.

Buildup of sludge on an Audi Allroad engineWhat causes Audi Allroad oil leaks and smells?

Many Audi Allroad's have a rough service history. We consider 'rough' to be irregular oil changes, extreme hot or cold climates, a lot of short driving where full engine temperature is never reached, and excessive low RPM city driving. This produces a great deal of condensation and moisture to form within the engine, causing a buildup of sludge. Many owners have bought an Audi Allroad without knowing the oil change and driving history. If you own or have bought an Audi Allroad with over 100,000 miles that has oil leaks, the crankcase breather system should be treated as suspect. If you remove the valve cover and see a lot of resinous accumulation in the valve train area, this indicates that the vehicle already has heavy amounts of oil sludge build up throughout the engine. Suspect number one is the Audi Allroad crankcase breather system. For more information and illustrations about the Audi Allroad Crankcase Breather Hose System us our website search and you will find a variety of information explaining how this buildup happens and how to fix it.

Years of rough service history as mentioned above, cause contamination to take place inside the engine which clogs the Audi Allroad crankcase breather hose system. Due to this blockage, the air flow generated within the engine crankcase is restricted and will not allow the system to breath properly. When the engine is running, pressure builds up in the crankcase and causes oil to push out and leak from the weakest parts of the engine.

Audi V6 2.7T cam chain tensioner gasket leak area1 - Audi Allroad Oil Leaks, Cam Chain Tensioner Gaskets and Seals

When the Audi Allroad camshaft adjuster seals and valve cover gaskets leak, they typically cause a burning oil smell. The passenger side cam chain tensioner seal is located on the backside of the cylinder head and will drip oil onto the down pipe causing this smell. This Audi Allroad leak is best seen through the passenger side wheel well as pictured (Image 1). The driver side cam chain tensioner seals will leak down onto the A/C compressor and oil filter area (Image 2).

2 - Audi Allroad Oil Leaks, Valve Cover Gaskets


When the Audi Allroad valve cover gaskets are leaking you will get a leak along the entire outer edge of the valve cover, which then begins to leak down onto the exhaust manifold. There will also be significant leaking into the spark plug chambers of the cylinder head (Image 3).

Audi V6 2.7T valve cover gasket

3 - Audi Allroad Oil Leaks, Camshaft Seals and Plugs

When the Audi Allroad camshaft seals are leaking, you'll find oil down the front side of the engine. There is usually an oil trail between the seam of the timing belt backing cover and the cylinder head. This oil trail continues down onto the underside of the oil pan making it easy to determine a leaking passenger side camshaft plug and seals (Image 4). The driver’s side camshaft plug’s and seals can be much harder to pinpoint. This is because the symptoms are similar to those of leaking cam chain tensioner gaskets. Typically, the driver side cam seals leak down onto the A/C compressor and oil filter area, similar to a leaking cam chain tensioner gasket. The best way to diagnose the leak on the driver side cam seal is to laterally look and see if it's leaking.

Audi Allroad V6 2.7T cam seals cam seal plugs

4 - Audi Allroad Oil Leaks, Front and Rear Crankshaft Seals

When the Audi Allroad front crankshaft seal is leaking you will see a trail of oil down the front and side of the oil pan. This is many times misdiagnosed as a leaking Audi Allroad oil pan gasket (Image 5). The rear Audi Allroad crankshaft seal will cause a collection of oil to accumulate and drip from the bottom of the bell housing area (Image 6). Crankshaft seals are made of very reliable materials and as a rule don't fail. The root cause for their failure is almost always due to a blocked crankcase breather hose system. With a clogged system, crankcase pressure within the engine is not released. This pressure along with the engine oil is then driven out of the crankcase past these front and rear seals.


Audi Allroad V6 2.7T crank seal