Hello,

Since I last changed the gearbox oil (completely by machine) in 2019, about 40,000 kilometers ago, I decided to use the popular method of refreshing by draining 4 liters through the sump and topping up through the dipstick - ​https:/ /www.youtube.com/watch?v=xRrhRV1vg-Y.​​​
What I'm interested in is what you think about this method, are there any specifics I should keep in mind with the procedure?

Thanks!

 

When you do a drain and fill. Do not just add the assumed amount that was drained. Drain the fluid into a measuring cup ( I like to use a paint mixing container) and add the same amount back in. You will need to drive around the block after to mix it in if you plan to repeat the process. Although honestly, if you have completely new fluid since 40,000km ago, I don't think you need to do a drain and fill this early.

Also, I would drain through the drain plug on the transmission. Sediment is heavy and will settle towards the bottom. So if there is anything in there, that would be a good way to get it out.

Inspect the dipstick for fluid color and smell. Red/brownish is good. Black and burnt smell is bad.

 

Hello, thank you for your answer.Since I'm not much of an active driver, I'm more concerned with the time factor than the mileage.
At the beginning of 2019, the oil was completely changed with 12 liters by the previous owner. In the summer of 2021, I bought it and so far I have not renewed the oil, and I also have a photo of its condition from 2-3 months ago, which you can see below.

My idea for doing the drain and fill procedure is that I have an engine oil change coming up next week and I was thinking of combining them.

 

Your fluid looks good. If you have no transmission issues you can leave it alone, but if you want to do a drain and fill, you'll be fine and won't hurt anything. Most critical part is adding as much as the amount removed and no more or less. Volvos are particular about the transmission fluid so make sure you use the correct stuff and amount. If I remember correctly the service life on transmission fluid is 60k miles(100k km) and I don't think they put a time factor into it.

 

I failed to mention that I will not do the procedure myself, but will take the car to a specialist workshop that only works with the Volvo brand. I will emphasize the moment with exactly the same amount to pour after it is drained. My concern was more whether I could damage the box with this process without actually needing it, but as far as I understand there is no such danger?

 

Yeah you are fine, drain and fill will not damage the gearbox. It is when people *flush* the gearbox that can cause issues. If it is a good volvo indy, they should treat it correctly for you.

 

I am in Bulgaria and this place is one of the best indy in the country so im sure they know what they are doing. Thank you!

 

time is not really a factor - think about it this way: Volvo does not specify a service interval for transmission fluid in its maintenance guides - only to maintain a proper level. There are plenty of opinions on whether to change and when - I am in the 100K mile camp, some are in the 50K mile (80km), and most owners never service the transmission. The only consideration I'd add is whether to go with 50K miles vs 100K miles is if you have extreme driving conditions - ie live in the mountains, pull a trailer etc.