I don't find my book, so: I plan to change fluids on AT and differential on 1990 and 1992 240's with auto and regular diff. quantity and type? Thanks!

IMHO - I would spend the extra money and put in full synthetic ATF. I've had great luck over the years with synthetic tranny fluid (both automatic and manual trannies) and I also run synthetic ATF in my 850's PS system. As an example, the 850 at 249k still has its original tranny, PS pump and steering rack.

Wished I had used synthetic in my 240's systems. Too cheap at the time... Before I sold that car at 300k, I had to replace the rack and the tranny leaked like a sieve...:)

ATF:
https://www.brickboard.com/FAQ/700-900/TransmissionAuto.htm
and...
https://www.brickboard.com/FAQ/700-900/TransmissionAuto.htm#7XX940FluidFlush

Diff:
https://www.brickboard.com/FAQ/700-900/Driveline.htm#DifferentialOilChangeRecommendation

240/740/940 - it's all the same.

Uncle bmwjohn,

Find your Volvo automobile owner manual for any year and any model Volvo, from the Shrine.

http://www.volvocars.com/us/own/owner-info/owners-manuals

However, others will mention specific makes and variations of fluids for your applications.

A passionately debate topic, you can find threads on this topic using the well-working search feature.

However, the current state of the debate should come as replies from actual folks that know way more about this stuff than me.

Questions?

Hope that helps.

Dairy Emergency Boyeeeee (little of of the owld moloko for the chai, in nadsat, oh my brothers and sisters. - Water pump install pending.)
--
Love your Volvo brick and your www.brickboard.com!