I own a 2010 VW Jetta, it’s a Wolfsburg edition which essentially means it’s a 2010 GLI. They did not make a GLI in 2010, but the Wolfsburg took its place. It has the Turbo motor and the sport suspension that the GLI had and is pretty much the same. I’m sure that there are other differences, but I don’t know what they are.
Anyway, I put a ton of miles on this car and I am always doing maintenance to it. I just had the odometer flip 100,000 miles and it is due for the 50,000 mile maintenance as well as the 100,000 mile maintenance. Following my maintenance schedule, this entails a transmission fluid change, a radiator flush and fill, and a new accessory drive belt.
To change the transmission fluid, you will need a 10 HEX key to unscrew the transmission drain plug and the transmission fill plug. You will also need a long spout flexible funnel and the transmission gear oil. For the gear oil I used 2.5 Litres of Valvoline Synthetic 75W-90 gear oil. The plugs are located in the positions shown below and are marked for which one is which. The drain plug is obviously the one on the bottom. Jack the car up enough to get the oil catch can safely under the car and in a position to catch the oil. Make sure to use jack stands for safety! Place an oil catch can underneath the drain plug and unscrew it, the transmission fluid will spill out and will be slightly thicker than the oil when you do an oil change. The fluid will probably come out very clean, if it does not you should inspect it for any debris or problems with the transmission.
Unscrew the fill plug, and insert the flexible funnel hose into the transmission. Once the transmission fluid had completely drained from the vehicle, replace the transmission fluid drain plug. Now you will pour the gear oil into the funnel. The funnel that I use has a narrow flexible tube that drains very slowly so I need to be careful not to overfill it when I am doing this. Your funnel or method may be different so use your best judgment. Allow 2.5 Litres of fluid to go into the transmission, remove the funnel and replace the transmission fill plug.
The radiator flush and fill was also performed. It does not appear that the 2010 VW Jetta has a radiator drain plug, so you will need to pull the radiator hose out of the radiator to drain the system. On the Wolfsburg edition, this hose is located above the Intercooler hose on the driver’s side of the car. What I do is, drain the system and fill it with water. Don’t forget to reattach the radiator hose that you disconnected when draining the system. Don’t tighten it down this time because you will be taking it off again very shortly. Run the car till it gets to operating temperature and the thermostat opens. This will allow the Antifreeze that was in the block to be flushed out of the system as well. I then drain the water out of the system and refill it with a 50/50 mixture of Antifreeze and water, remembering to tighten the radiator hose properly before refilling.
I also like to replace the accessory drive belt at 100k. This is just so I don’t have to worry about it breaking or going bad. This is an easy job in almost any vehicle today. There will be a tensioner pulley that applies the proper amount of tension to the belt when it is installed on the car. Just find the right size socket that fits the tensioner pulley, attach it to a breaker bar, and pull to loosen the tension and remove the belt. When installing, route the belt the same way as the old one and get it as close as on as you can, once you get it there you will be able to pull on the tensioner pulley and install it all the way.