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Service kits

Changing the supercharger oil on your Audi's 3.0t engine isn't a necessity; Audi themselves say that the oil is for life. But tuners and owners alike have found no harm in changing the supercharger oil, especially with an engine running more boost. The oil change itself is easy to complete and cheaper than an engine oil change. If you have the supercharger off of the car for any reason, you're able to give yourself that extra peace of mind for no hassle at all.

Removing the supercharger on your B8/B8.5 Audi S4 isn't a terribly difficult job. Remove a few vacuum hoses, coolant lines, and a couple of bolts, and it pops right off. The process on the S4 will be relatively the same across the board for any Audi 3.0t engine, such as the S5, SQ5, Q5, A6 Quattro, A7 Quattro, and A8 Quattro. While you have the supercharger off, why not clean your intake valves, or make the car go faster?

 

Audi models and years applicable:

  • 2010-2016 Audi S4
  • 2011-2018 Audi Q7
  • 2011-2017 Audi S5
  • 2012-2018 Audi A7
  • 2012-2018 Audi A6
  • 2013-2018 Audi A8
  • 2013-2017 Audi Q5
  • 2014-2017 Audi SQ5

 

How much will it cost to replace the supercharger oil in an Audi S4?

Put aside around $100 for the parts needed to change the oil. The oil bottle is $41, the gaskets total around $18, and the PCV hose is $4. Use the rest of the budget on rags, brake clean, and extra coolant. 

 

How long will it take to replace the supercharger oil in an Audi S4?

The longest parts of this job are the supercharger removal and reinstallation. Changing its oil is a quick process. Set aside a couple of hours to complete the DIY.

 

Parts required to replace the supercharger oil in an Audi S4:

 

Tools required to replace the supercharger oil in an Audi S4:

 

Steps required to replace the supercharger oil in an Audi S4:

Step 1: Remove the supercharger

Start by removing any vacuum line from the intake tube. Use an 8mm socket to release the hose clamp for the intake tube on the throttle body and pull up on the airbox to remove it from its mounting grommets. Then, remove the intake assembly from the engine bay.  

DIY Audi 3.0T Supercharger Oil Change loosening the intake hose clamp

DIY Audi 3.0T Supercharger Oil Change removing the intake assembly

Next, remove the engine dress-up covers to reveal the sensors and solenoids behind the supercharger.

DIY Audi 3.0T Supercharger Oil Change removing the dress-up covers

The vacuum lines on the back of the supercharger all have their specific places. Use something like a sharpie to mark the lines to ensure that they don't get mixed up during reinstallation. Then, disconnect all of the electrical connections from the back of the supercharger. 

DIY Audi 3.0T Supercharger Oil Change disconnecting vacuum lines

DIY Audi 3.0T Supercharger Oil Change unplugging connections

DIY Audi 3.0T Supercharger Oil Change unplugging connections

Next, remove the evap hose from the throttle body.

DIY Audi 3.0T Supercharger Oil Change removing evap hose

On either side of the supercharger is a MAP sensor. Pull up on the white tab and disconnect the sensors.

DIY Audi 3.0T Supercharger Oil Change disconnecting the MAP sensors

In between the MAP sensors and the valve covers are long and thin plastic covers. The removal process will be different depending on the model year. Early 3.0T models must use a T25 Torx socket to remove two bolts that fasten down the cover. Later models need a pick to lift on the left side cover's locking tabs and the T25 for the right side cover. 

DIY Audi 3.0T Supercharger Oil Change removing MAP sensor cover

DIY Audi 3.0T Supercharger Oil Change removing MAP sensor cover

Next, take a long 16mm wrench and slide it between the front of the engine and the radiator to loosen the supercharger belt tensioner. Position the wrench on the tensioner's bolt and rotate it to the right. Then, pull the belt off of the supercharger.

DIY Audi 3.0T Supercharger Oil Change relieving the tensioner's tension

If you are reusing the belt, you can leave it in place after you slip it off of the supercharger. Then, head over to the coolant expansion tank and open the cap to relieve the coolant system of its pressure.

DIY Audi 3.0T Supercharger Oil Change removing evap hose

Then, remove the clamps from the two coolant lines on the front of the supercharger. Use a pick to break any coolant build-up preventing the hose from moving before pulling the hose off the supercharger. 

DIY Audi 3.0T Supercharger Oil Change removing the supercharger coolant hoses

The coolant hoses mount to the engine on the driver's side cylinder head. Use a T30 Torx socket to remove the bolt and allow the hoses to move freely. Then, pull the coolant hoses off of the supercharger.

DIY Audi 3.0T Supercharger Oil Change removing coolant hose mounting bolt

Next, use a 16mm socket to remove the six nuts securing the supercharger to the intake manifold.

DIY Audi 3.0T Supercharger Oil Change removing the supercharger nuts

Place some rags or absorbent cloth over the radiator support and front bumper to catch any fluids that may come out of the supercharger as you remove it. Then, place ratchet extensions through the loops on opposite corners of the supercharger to create makeshift handles. Use those handles to lift the supercharger off of the engine.

DIY Audi 3.0T Supercharger Oil Change removing the supercharger

 

Step 2: Replace the supercharger oil

Prop up the front of the supercharger and use the 3/16 hex bit to remove its fill plug.

DIY Audi 3.0T Supercharger Oil Change removing the supercharger's fill plug

Then lift and tilt the supercharger to let the old oil drain out into a cup. The superchargers don't get a set amount of oil, so you'll need to measure the amount you poured out.

DIY Audi 3.0T Supercharger Oil Change draining the supercharger

DIY Audi 3.0T Supercharger Oil Change measuring the supercharger oil

Once you measure what came out, rinse the measuring cup out, and fill it with the new oil. Then, pour the new oil into the supercharger. Use the 3/16 hex bit to thread the fill plug back into the supercharger and snug it up. 

 

Step 3: Reinstall the supercharger

First, reconnect the secondary air-line and refit any insulation pieces that you may have removed during the job. Then, remove the old, green supercharger gaskets and replace them with new ones. 

DIY Audi 3.0T Supercharger Oil Change installing the new supercharger gaskets

Next, lightly lubricate the o-rings of the new supercharger breather pipe and press it into the engine. Then lay the insulating engine valley cover over it.

DIY Audi 3.0T Supercharger Oil Change installing the new breather pipe

DIY Audi 3.0T Supercharger Oil Change installing the engine valley cover

Now, grab the supercharger and seat it onto the engine. Ensure that all of your vacuum lines and sensor wires for the back of the supercharger are not getting pinched or trapped under it as you press it onto the engine. Then, thread on the six 13mm nuts onto the supercharger mounting studs.

DIY Audi 3.0T Supercharger Oil Change tightening the supercharger nuts

Torque the supercharger nuts to 20Nm. Next, attach the coolant hoses to the front of the supercharger and clamp them down. Then, use a T30 Torx socket to install the bolt that secures the coolant lines to the engine. 

DIY Audi 3.0T Supercharger Oil Change reconnecting the coolant hoses

DIY Audi 3.0T Supercharger Oil Change installing the coolant line mounting bolt

Next, reconnect the vacuum lines and three electrical connections on the back of the supercharger. Then, move to the other side of the engine and reattach the throttle body's electrical connections.

DIY Audi 3.0T Supercharger Oil Change reconnecting the vacuum lines and electrical connections on the back of the supercharger

DIY Audi 3.0T Supercharger Oil Change attaching the evap line

After that, install the covers that sit under the MAP sensors on either side of the supercharger. Use a T25 Torx socket to tighten the bolts. Then, reconnect the MAP sensors on either side of the supercharger.

DIY Audi 3.0T Supercharger Oil Change attaching the MAP sensor covers

Next, reach down in front of the engine and pull up the supercharger belt. First, ensure that the belt is still correctly oriented on the engine's pulleys. Then, use a long 16mm wrench to release the tension from the belt tensioner. While holding the tensioner, use your other hand to reinstall the belt onto the supercharger.

DIY Audi 3.0T Supercharger Oil Change fitting the supercharger belt

 

Step 4: Refit the intake

Take the intake assembly and fit it into the engine bay. Attach the intake tube to the throttle body, then seat the airbox into place. Clamp the airbox down and use an 8mm socket to tighten the intake hose clamps.

DIY Audi 3.0T Supercharger Oil Change tightening the intake hose clamps

DIY Audi 3.0T Supercharger Oil Change fitting the vacuum line to the intake

Lastly, attach the vacuum line to the intake.

 

Step 5: Fill the coolant and test the engine

Open the expansion tank and fill it with coolant. Then, open up the bleeder screws on the supercharger. Start the car and run it, allowing the air to bleed from the cooling system. Keep an eye on the coolant level and add it as you see fit. 

As the engine runs, check for any coolant or fuel leaks. If everything checks out, jack up the front of the car and reinstall the undertray. Slide the front of the tray into the bumper and lock the tray into place with a T25 Torx socket or screwdriver. 

With fresh oil, your supercharger is ready for more spirited driving. If you're interested in more DIYs for your Audi, you can visit audi.fcpeuro.com or subscribe to our YouTube channel. 

If you have any questions or comments about replacing the oil in your Audi's supercharger, leave them in the comments section below.

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Written by :
Christian Schaefer

Owner of a flat-six swapped 1998 Impreza 2.5RS and a 1973 Porsche 914. Horizontally opposed views, only.


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