Haldex Oil and Filter Change - How To.
Haldex Oil Change.
Haldex Oil should be changed every 20K miles. You just need a tube of oil P/N G 052 175 A1, Tool VAG1628 (Silicone Gun, basically), and an allen key. So no special tools required really.
The drain plug is located on the bottom of the Haldex unit, which is located just ahead of the rear diff. Use an allen key (I canít remember what size, maybe 5mm) to undo the drain plug and catch the fluid in a container. Only about 300ml of oil will come out, as you donít actually completely change all the oil, only part of it.
To refill, put the tube of oil into your silicone gun, hold it upright and cut the tapered tip off of the tube, leaving the threaded part, and screw the nozzle onto the end. Here comes the tricky part. You have to refill the Haldex unit through the drain plug. Yes, honestly!
Hold the trigger of the silicone gun in one hand, and the drain plug in the other (I normally do a practice run on refitting the drain plug first). Stick the nozzle of the Haldex tube into the drain plug, so that goes straight into the drain hole and fits tightly. Pull on the gun trigger repeatedly to squirt all of the oil into the Haldex unit. When you canít squeeze any more oil out of the tube and the tube is empty, quickly pull out the tube nozzle and put the drain plug back in, trying not to let too much oil run down your arm. Tighten up the drain plug and youíre done.
Haldex Filter Change.
The Haldex filter should be changed every 40k miles. The filter is located on the RHS of the Haldex unit. You will need Tool T10066 for this job, the filter itself P/N 02D 525 558, and the filter sealing ring P/N N 903 445 01. The filter tool is a large ring spanner with a 90į bend in it.
To change the filter, just poke the T10066 through to the filter head, and undo it. Make sure you remove the old sealing ring, and replace both filter and ring.
The original filter body is made of metal, whereas the replacements are made of nylon. If youíve had main dealer servicing since your car was new, donít be surprised if it still has the original metal Haldex filter. Like the fuel filter, these things tend to get left undone.