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Vw Passat Breather Hoses - Vw Passat Crankcase Breather Hose System

Vw Breather Hose - Clogged Vw Breather HoseIn Blauparts' repair service facility we've noticed that Vw Passat's equipped with the V6 30 valve engine, often develop oil leaks with advanced age and high mileage. Repeated attempts are made to stop the leaking by replacing multiple gaskets and seals. Before you go through the repair costs of having these seals and gaskets replaced, Blauparts would like to bring a prominent issue with the Vw Passat crankcase breather hose system to your attention.

Vw Passat Oil Engine Sludge 1
Vw Passat Oil Engine Sludge 2
Vw Passat Oil Engine Sludge 3Vw Passat Oil Engine Sludge 4

Many Vw Passats have a rough service history. Blauparts classifies the term 'rough' to be:

  1. Irregular oil changes.
  2. Extreme hot or cold climates.
  3. Not using the correct motor oil specification.
  4. Not using the correct oil viscosity.
  5. Repeated short driving distances where full engine temperatures aren't reached and maintained. Read more about how this affects your engine.
  6. Excessive low RPM city driving, which produces a great deal of condensation and moisture to form within the engine, causing a build up of motor oil sludge. Read more about how city driving affects your engine.

Many owners have bought their Vw Passat without knowing the oil-change history or the type of driving conditions the vehicle was subjected to. If you own or have recently bought a used Vw Passat with over 100,000 miles and have oil leaks, the crankcase breather system should be treated as suspect and checked. An abundance of resinous accumulation (broken down motor oil) in the valve train indicates the system already has heavy amounts of oil sludge build up throughout the engine and crankcase breather hoses. This engine buildup is most commonly caused by using the incorrect motor oil specification for your model, or incorrect oil change intervals for the type of driving style.

Clogged Vw Passat Breather Hoses

Years of rough service history, as mentioned above, causes major engine contamination. When the crankcase breather system becomes clogged, the air flow generated within the engine crankcase is restricted and doesn't allow the system to breath properly. Too much pressure built up in the crankcase causes oil to push out and leak from the weakest parts of the engine (front and rear crankshaft oil seals).

Plugged Vw Passat Crankcase Breather HoseTo check the condition of your Vw Passat crankcase breather hose system follow the steps below.
This will help you determine whether your oil leak(s) could be caused by a plugged or restricted Vw Passat crankcase breather hose system.

  1. Remove the fasteners that hold the coolant expansion tank in place. Unplug the level sensor on the bottom and place the tank off to the side leaving the coolant hoses connected.
  2. Remove the center and drivers side decorative engine covers.
  3. Locate the Vw Passat crankcase breather hose on the backside of the drivers side valve cover. To slide the Vw Passat breather hoses off, compress the two pressure finger clips and gently pull out. Be careful! As the car gets older and advanced in miles, the years of high engine temperatures (under the hood) can cause the crankcase breather hoses to become brittle and easily breakable. (See images below)

If the inside of your Vw Passat crankcase breather hose system looks to be restricted with oil sludge deposits,it's likely that the pressure control valve, check valve and suction pump are also plugged. You can remove the valves and lightly blow through them to check if they're restricted or clogged.

Due to these common issues with high mileage 2.8 liter V6 30 valve engines, Blauparts has designed a complete rebuild kit to bring your vehicle's crankcase breather system back into peak working order.

Blauparts® Vw Passat Crankcase Breather Hose Kit Includes:

  • PCV Vw Passat Crankcase Breather Hose
  • S Type Vw Passat Crankcase Breather Hose
  • Updated Vw Passat Check Valve
  • Updated Vw Passat Suction Pump Valve
  • All Necessary Hose Clamps
  • Blauparts' Detailed 'We Care!' Step-By-Step Instructions
    Vw Passat Crankcase Breather Hose Kit

Please Note: The information and pictures refers to a V6 30 valve engine. However, this information can also be applied to other Vw models and engine configurations. For example many Vw Passat models with 4 cylinder 1.8L turbo, Vw Jetta, Golf, or Beetle models with 4 cylinder 2.0L, or 5 cylinder 2.5L gasoline or diesel engines, have been subjected to rough service history. All Vw Jetta, Golf, and Beetle engines and configurations have crankcase ventilation breather hose systems. If your Vw Jetta, Golf, or Beetle has oil leaks from the front or rear crankshaft seal areas, there is a strong possibility that the vehicle has experienced a rough service life. Technicians should inspect the crankcase breather hose system for restriction caused by a build up of oil varnish and sludge. A previous rough service life doesn't have to mean the end of your car's engine. Take action and immediately start using the recommended Vw oil specification in your car.

To prevent this buildup, Blauparts recommends using Ravenol motor oil in your Vw Passat. Made in Germany, Ravenol is an advanced synthetic motor oil that is specifically engineered to meet Vw Passat oil specifications extending Vw oil change intervals, while fighting against sludge build up in the valve train area. Varnish and sludge build up eventually leads to crankcase breather hose restriction, excessive crankcase pressure, and subsequent Vw Passat oil leaks. Ravenol's unique oil formulation has the ability to substantially reduce internal engine friction, resulting in increased fuel mileage, reduced emissions, and extended engine life at an affordable price.

Vw Passat Oil Specs502 00Ravenol
1 Liter
5 Liter
Vw Passat Oil Change Kits
What are the different features of Ravenol's VPD, VMO, and HPS Vw oil?
How to choose the right Vw oil weight or viscosity?
1998-05  Passat 2.8L 30VXVPD 5W-40
VMO 5W-40
HPS 5W-30
VPD 5W-40
VMO 5W-40
HPS 5W-30
VPD 5W-40
VMO 5W-40
HPS 5W-30
Passat 30V 5W-30
Passat 30V 5W-40

The below links are to detailed pages endeavoring to simplify the difficult task of diagnosing Vw Passat oil leaks, especially on these engines. Blauparts' goal is to help you target a Vw Passat oil leak. After repairing the Vw Passat crankcase breather hose system it is common for engine oil leaks to subside and/or stop. If the leaks do not stop, check these common Vw Passat oil leak points:

  1. Vw Passat Oil Leaks - Cam Chain Tensioner Gaskets and Seals
  2. Vw Passat Oil Leaks - Valve Cover Gaskets
  3. Vw Passat Oil Leaks - Camshaft Seals and Plugs
  4. Vw Passat Oil Leaks - Front and Rear Crankshaft Seals

If your vehicle is experiencing oil leaks or related conditions, Blauparts® recommends bringing this information to your technician's attention for proper diagnosis.

Related Vw Oil Pages

Vw Oil Quality Standards

What are Vw oil quality standards and are they important?
Can I use non-approved Vw oils that don't meet Vw oil quality standards?

Types of Vw Oil Quality Specifications

    – VW 500 00 [ Superseded to newer VW 502 00 oil specification ]
    – VW 501 01 [ Superseded to newer VW 502 00 oil specification ]
    – VW 502 00
    – VW 503 00
    – VW 503 01 [ Superseded to newer VW 504 00 oil specification ]
    – VW 504 00
    – VW 505 00
    – VW 505 01
    – VW 506 00
    – VW 506 01
    – VW 507 00

Vw Oil Weight

How to determine what Vw oil weight to use in your specific model.
How driving and environment conditions may affect your Vw oil viscosity choice.

Vw Oil Change

Basic overview on how to change your Vw oil.
How often should I change my Vw oil?
How driving style can affect your Vw oil change intervals.
Correct Vw oil change specifications.

Ravenol of Germany Fully Synthetic Vw Oils

3 reasons why you should always use synthetic Vw oils.
Recommended Ravenna Vw oil specifications and features.

How To Find Out What Vw Oil Type Your Car Uses