XC70: Information Potential new owner - 2015 XC70 D5 AWD

[zapcity1]

Originally Posted by Johnny Kebab

Is a transmission fluid change something that could be done yourself?

JK

Yes. Sump dump is relatively easy to. Full change a bit harder and more expensive!

Video here: - https://www.youtube.com/watch?v=EAb9p8Wph-M

About £40 for 4 litres of ATF from dealer.

Did 2x sump dumps on mine in about 2 hours having never done it before.

Ideally you need VIDA to monitor the ATF temp. when setting the level and for resetting the 'transmission fluid change counter', plus a few larger hex sockets/torx bits (as per the video) if you don't have them.

If you can get the dealer to do it before delivery then great negotiating!!

[Tatsfield]

There is a factor of diminishing returns on sump dumping the auto box. The more ATF that is retained in the torque converter, the greater the number of dumps you have to do to have a meaningful effect on the percentage of clean new fluid to old burnt fluid. However the more you do the less effect each of the last ones has.

The box contains about 7 litres of fluid but you can only dump 2. I would want to change 75% of the fluid to ensure that there was m much more new than old fluid ion the box. Since you only change about 30% of the oil and each time you actually take out a mixture of old and new in the ration of 5:2, it will take 4 sump dumps to reduce the "old" content of the mixed oil to just below 25%. It would take 7 sump dumps to reduce the mixture to below 10% old oil content. That would be 14 litres of oil to reduce the contaminated content of 7 litres to below 10%! After this point the improvement gets less and less with each dump and isn't worth doing.

If you are doing this job yourself it is only the cost of the oil but if you are paying a garage, that would be 4 "oil changes" labour charges plus the oil minimum and if you're really fussy, 7! So if you are using a garage, it's probably cheaper to ask them to completely drain the box and replace the 7 litres! If you just do one sump dump, you still have 70% contaminated oil in the box. The question to ask is what degree of contaminated oil can be left in the box with the least worry. While you'd pay more labour to drain the box, you'd use less oil than you would sump dumping.

[AndyB06]

Originally Posted by Tatsfield

The box contains about 7 litres of fluid but you can only dump 2

I get just over 3L from one ‘dump’

Therefore after 3 dumps she’s ~81% fresh fluid. Although I prefer to space them out, a few hundred miles between.

[zapcity1]

Originally Posted by AndyB06

I get just over 3L from one ‘dump’

Therefore after 3 dumps she’s ~81% fresh fluid. Although I prefer to space them out, a few hundred miles between.

Me too. 3 litres/dump, leaving 4 in the gearbox. Trick is to add 4 litres not 3 thus you change 50% on the first dump. 2nd time you change 25% of original ATF, 3rd time 12.5% and so on. As said, diminishing returns.

So my process is dump 3, add 4, mix, dump 4, add 4, mix, set level (dump approx 1).

Changes 75% of ATF in one hit for a sensible cost.

Can't take credit for this as it comes from Yuri's Volvosweden vid!

[Bonefishblues]

I have nothing to add to the above except to observe how many doctors there are thundering up and down the nation's motorways

[zapcity1]

Originally Posted by Bonefishblues

I have nothing to add to the above except to observe how many doctors there are thundering up and down the nation's motorways

and vets!

[rosscow]

Do you think the dealer is spinning me a yarn?!

[Bonefishblues]

Originally Posted by rosscow

Do you think the dealer is spinning me a yarn?!

I would never impugn the reputation of such an august profession.

By the way was his granny still for sale?

[rosscow]

Included in the price!!!

[apersson850]

Originally Posted by 1monkey600

The numbers in the manual titles give model year and 1st week of build, i.e. 2015-AT 1446 is for a MY2015 model, built from week 46 of 2014 onwards, 2015-AT 1420 is MY2015 built between week 20 of 2014 and week 45 of 2014.

And for you who don't speak Swedish, I can inform you about that "AT" is the English version of the original "ÄT".
"ÄT" is an abbreviation for "ÄndringsTillfälle", which means time of engineering change.
So that's simply the week when they start to produce a car, where the basic version of the car (not buyer specified options) is different, compared to previous week.