Automatic transmission fluid brand recommendations

[Rcooper]

1998 S70.Is castrol automatic transmission fluid good?or is there another brand that would work better.

[MoVolvos]

1998 S70.Is castrol automatic transmission fluid good?or is there another brand that would work better.

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Use to have a 98 S70 T5 back in 2012. Currently a 00 S70 SE NA. Both are not that sensitive to transmission fluid though I found the Swepco 714 20W to work best for most of my cars transmissions. Worked especially well on the 98 S70 T5 with a complete flush. Mine was coffee dark with a hew of sliver at 230K miles when purchased. The 4 speed in the 98 is a strong transmission compared to the 99 and 00 5 speeds. I like the shift better. Currently have 5 auto Volvos to compare with and 1 M66.
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This should work well.
Now $6.98
Castrol Transmax Import Multi-Vehicle Automatic Transmission Fluid, 1 Quart
https://www.walmart.com/ip/Castrol-Tran ... irect=true
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Was under $6 when I started using it maybe 20 years ago. I only stock this as an additive due to cost although I recently found a Close Out so stocked up. Will use one or four quarts after a drain and fill or complete flush.

Swepco 714 Hydraulic Transmission Fluid Type TO-4/C-4 20wt. Gal.
https://www.amazon.com/Hydraulic-Transm ... hdGY&psc=1
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[aeg]

The 4-speed automatics originally took Dex/Merc, but Volvo has said JWS3309 is also OK and may give smoother lockup engagement (Tech Net Note 40-04 and Service Bulletin 43-0029). One option for JWS3309 is Toyota T-IV, part number 00279-000T4-01 for 1 quart or 00279-000T4-6S for 6 quarts, about $6 a quart from the Toyota dealer. Many people are running this in their Volvos.

[jreed]

In my '97 855 GLT (~260k miles), I have had good results with Castrol transmax high mileage ATF, with wife reporting smoother shifting compared to Castrol Dex Merc, the previous fluid I used.

[abscate]

Valvoline Dex6 Synthetic recommended by Volvo tech jimmy57 here. Great price in the jungle if you wait a month or two.