850r Auto fluid change Best way??

[merc85]

Hi peeps, as you know ive recently purchased a 1996 850r Auto, it has full history and the Auto box has had a fluid change at around 150k, she's now on 170 and i want to chnage the fluid as a precaution since my last 850 auto lol.

How do you guys do it? last time i did one we disconected the Return line ran the engine for a few seconds until it pumped out x amount, then refilled with the same amount, and repeated this until the fluid was Red.

Now ive read several people have actually drain the box from the bottom via the drain plug, Apparently this expels roughly 3.5 lts. then refit the plug the you refill with 2 litres of atf then run again thought the gears waiting 5 seconds in each gear before shifting to the next.

Finally once again when the fluid turns RED you top up usually 3 l- 3.5 litres and check the level in the normal matter.

Which way is best do you think??

[Kingsford G]

All correct,just have a measuring jug to for what comes out so u can top up the same amount,took me about 13L to get it nice red.Also if you keep the top up fluid warm somehow u can top up much quicker.

[merc85]

All correct,just have a measuring jug to for what comes out so u can top up the same amount,took me about 13L to get it nice red.Also if you keep the top up fluid warm somehow u can top up much quicker.

what are you upto tomorrow night? lol

[Kingsford G]

Just missed.Allways top up what comes out including 1st 3-3,5L u top up with the same amount but not 2L as you said.

[Kingsford G]

what are you upto tomorrow night? lol

Working till 7pm usually,come down with the fluid if u want.

[merc85]

Just missed.Allways top up what comes out including 1st 3-3,5L u top up with the same amount but not 2L as you said.

yes thts what i thought, its just what i had read somewhere

[Kingsford G]

yes thts what i thought, its just what i had read somewhere

That`s how I did my R when I bought it and red from mathewsvolvos all the info.

[AndysR]

I'd remove the return hose start the engine and let the box pump the fluid out whilst at the same time topping the box up with fresh oil through the dipstick tube

I'd also go for a decent brand Dextron III fluid

[AndysR]

Happy to give you a hand with it tomorrow evening if you like, although it will need to later in the evening as I'm not about until then...

[AndysR]

I'd get at least 15 litres of fresh fluid, you can always return what you don't use

[stribo]

I'd get at least 15 litres of fresh fluid, you can always return what you don't use

If only he knew of a decent motor factors.

[merc85]

If only he knew of a decent motor factors.

i know of several pmsl

[Kingsford G]

There is a stage fluid change too.Drain the sump and top up with the same amount every week or 2 4-5 times,till its red really.Andy u`d never keep up topping up with a return pipe off cos it spill about 2,5-3L fluid in about 40 sec.

[siamblue]

IIRC when i did my R the first way you said it with draining 2 ltrs,until it started to expel a little air.
i got mine from GSF think it was £6 a gallon so i bought 3..

[Kingsford G]

IIRC when i did my R the first way you said it with draining 2 ltrs,until it started to expel a little air.
i got mine from GSF think it was £6 a gallon so i bought 3..

I bought a Castrol transmax,£8 per L lol

[merc85]

£6 a gallon is very very cheap

[jamesy12345]

I just changed the fluid via the plug, topped up via the dipstick then planning to change again in a short time.

I used this stuff...

http://www.carlube.co.uk/index.cfm?product=153

[ROZER]

I just changed the fluid via the plug, topped up via the dipstick then planning to change again in a short time.

I used this stuff...

http://www.carlube.co.uk/index.cfm?product=153

same stuff I used to do a full flush it took 13L to get mine cheery red I have done 30k since box feels fine.

[jamesy12345]

same stuff I used to do a full flush it took 13L to get mine cheery red I have done 30k since box feels fine.

looks that that stuff (Carlube ATF-U) is about 20 quid for 4.5 litres

[ROZER]

the carlube atf-u is fully synthetic so I would do a full flush not sure if the two oils would mix .?