This Post relates on how to change the automatic transmission oil/fluid on a GEN3 (2009) XC70. The Gearbox is a 6-Speed Automatic (TF-80SC).

The Gearbox is supposed to be sealed for life, but many owners report changing the fluid and finding a dark sludgy liquid in there after only 50,000 miles. My own car is on 58,000 miles, and the fluid was in reasonably good shape, still reddish, and looked OK (but I don’t use my car for towing, I always select neutral when stationary, most of my journeys are quite long, and rarely stop-start driving).

Preliminary Information

• The Auto Box holds 7.0 litres of Transmission fluid JWS 3309 (according to my manual).
• JWS 3309 is relatively hard to find (I don’t think Halfords stock it!), but I used Opie Oils http://www.opieoils.co.uk/p-69402-mo…ion-fluid.aspx The Volvo part #’s are given below:
  
• Unlike most gearboxes I have changed, removing the drain plug does not allow all the oil to escape, only 3 litres. There are two main procedures for changing the oil:

1. The one “drain and fill” described here, where approx 3 litres of fluid is changed at a time.
2. The “gibbons method” of flushing where a drain and fill are included in the circuit, and the car’s pump moves the oil around, drawing in fresh oil, and dumping old oil. On the Volvo, you remove the line to the transmission oil cooler, and put that to waste, and have another pipe to a container of new oil into the oil cooler, when the car is started the old oil is pumped to waste, and the new oil is drawn into the system.

• Using “drain and fill”, you only change 3 litres of fluid at a time, but it is easy to do. If my maths is correct, on the first drain/fill, 43% of the oil is replaced, and on the 2nd drain/fill, 60% of the oil will have been replaced, on the 3rd drain/fill, 76% of the oil will have been replaced, and on we go…

Tools Needed

4 litres of JWS 3309 Fluid (I managed to only use 3, but see below).
Torx 55 bit for filler plug
Torx 40 bit for level check plug
17mm hex sump plug tool (like this http://www.moatdirect.co.uk/drain-pl…tool-614-p.asp )
Funnel for Refilling (see my pic below)
Torx bit (T30 I think) for Sump Guard
Bricks.

Procedure

I went for a short drive first to warm things up.
My drive is on a slight slope, so when I run the front of the car up on some bricks, the car is level, and it gives me slightly more access underneath.

First I removed the sump cover (large plastic cover underneath with 8 x TORX fasteners).

Then the Air Filter box. It’s mounted on 2 rubber holders. I removed the pipe at the front (inlet) first. Then loosened the jubilee clip where the airbox goes into the large pipe along the front of the engine (and sealed both ends with cling film to make sure I didn’t drop enything in there).

Now loosen the TORX 55 plug (shown here with funnel unserted for refilling):

Go under the car, and you’ll see a large fastener at the bottom of the gearbox. It’s a concentric drain/level plug shown here – the upper picture shows the level-plug (torx 40) and the lower picture shows the 17mm sump drain plug:

^^^ Note the sump drain plug has a “pipe” to the top of it, which sets the level.

Have a container (which will hold a minimum of 3 litres) under the drain/level plug now, and catch all the escaping oil so you can measure it later… I removed the level plug first (you have to do this anyway, to allow the 17mm tool to be inserted). When I removed my level plug, around a cupful of oil escaped (engine off, lukewarm, level ground).

Now take out the 17mm plug, and catch the escaping oil.

Measure the drained oil (mine was exactly 3 litres).

Install the drain plug (I didn’t use a new washer, but I will next time) and level plug (I didn’t install the level plug, and a small amount of new oil escaped when the 2nd litre was filled, before I quickly re-insetred the level plug). Both the level screw and the filler plug have re-useable rubber washers. If you are happy to measure the new oil, and confident you have added the same amount as drained, you may wish to just refill the oil with the same amount as drained, and the level should be correct (see below for the info from VADIS on oil level checking).

Using the funnel (as shown in the first image), I refilled exactly the same amount of oil as had drained (3 litres).

Torque setings for plugs:
Drain Plug 45nm
Level Plug 8nm
Filler Plug 30nm

Once refilled, re-install the filler plug, air filter box, sump guard, job done.

Future

I’ll change the gearbox fluid with a fresh 3 litres every 20k miles I think – from what I have seen that will keep the fluid relatively fresh…

Next time, I’ll add slightly more than the 3 litres (probably 3.2 litres, so 200ml overfilled), put the vehicle back together (except the sump cover), and perform this level check (from VADIS apparently):

I should expect that following this procedure, (obviously without a workshop diagnostic tool, we can’t check oil temperature, but realistically, “lukewarm” should be fine) that around 200ml (i.e the amount I purposely overfilled by) of fluid will run out of the level plug, and the level will be set correctly.

The car does drive better since the fluid was changed, the gearchange does seem smoother.