4.0L V8 TT Engine Oil Change
DISCLAIMER
As always, follow all safety protocols. Don't undertake this task if you aren't comfortable with it, fully understand it, and are capable of completing it. The information provided may be incomplete or inaccurate. You are ultimately responsible for anything you do. Neither Redpants, LLC or myself is responsible or liable for anything that may occur.
Unlike the naturally aspirated V8 engines that came before it, the 4.0L twin-turbo has a traditional drain-and-fill process for its engine oil. It does, however, have an oil filter that’s not as simple as was previously used. Since it’s a Mercedes engine, the oil filter is a cartridge-style one that needs some disassembly to replace the filtration media itself rather than having a self-contained filter that’s replaced in its entirety. But don’t let that spook you - it’s still an easy job.
Needed
Oil Change Package
0w20 engine oil
Socket
Hex socket
Ratchets for the above sockets
Drain pan
Oil funnel
Paper towels or shop rags
Torque Figures
Drain plug: 30 Nm. (22 lb/ft)
Oil filter cap: 25 Nm. (18.5 lb/ft)
Access panel bolts: 23 Nm. (17 lb/ft)
Before you begin
WARNING: This process includes warming up the engine to ensure the engine oil is fluid enough to drain properly. Be careful of hot oil and hot surfaces while doing this job.
Step 1
Run the engine for 5 minutes.
Note: Once finished, wait 5 minutes before draining the engine oil in Step 3.
Step 2
Remove the oil cap from on top of the engine - this will allow the oil to drain smoothly from the oil pan.
Raise the car off the ground using a lift or a jack and jack stands.
Step 3
Place a drain pan under the drain plug, then use the hex bit to remove the drain plug on the oil pan at the bottom of the engine.
Discard the old washer from the drain plug. Once the oil has finished draining, clean the drain plug area and install the drain plug with the new washer.
Drain plug torque: 30 Nm. (22 lb/ft)
Step 4
Remove the three bolts that attach the access panel to the center undertray, then set aside the access panel to reveal the oil filter cap.
Step 5
Set the drain pan under the oil filter cap, then loosen the oil filter cap and let the oil drain.
Once the oil has finished draining, pull out the oil filter cap and filter assembly.
Step 6
I sell two versions of the Oil Change Package for this engine: The Oil Change Kit and the Complete Package.
The picture below is of the Complete Package version, which shows the various parts.
If you’ve bought the Complete Package version, the entire assembly gets replaced - you just need to assemble everything.
If you’ve bought the Oil Change Kit version, do the following:
Remove the O-ring from the oil filter cap and discard it.
Clean the oil filter cap and then install the O-ring where the old one had been.
Remove filter from the central flow pipe and discard the filter.
Clean the central flow pipe and then install the new filter onto it.
Install the oil filter and central flow pipe into the oil filter cap.
Step 7
Put a dab of engine oil on the oil filter cap O-ring to lubricate it.
Install the oil filter cap and assembly into the engine.
Oil filter cap torque: 25 Nm. (18.5 lb/ft)
Step 8
Reinstall the access panel and three bolts to secure it.
Access panel bolts torque: 23 Nm. (17 lb/ft)
Step 9
Use the oil funnel and fill the engine with 8.5L of 0w40 engine oil.
Check for any leaks, then reinstall the oil filler cap.
All done!