Differences between G 052 162 A1 and G 052 162 A2 ATF?

[monkeytronic]

The '02 A6 4.2 is due for its ATF change and I'm researching what other brands of ATF I could use that meet Audi specs for the ZF 5HP24 5-speed automatic that the A6 sports.

Apparently the 5HP24 prefers G 052 162 A2 ATF but a number of ATF brands seem to be compatible with G 052 162 A1 ATF. That said, what's the difference between G 052 162 A1 and G 052 162 A2 ATF?

[CoolAirVw]

Quote, originally posted by monkeytronic »

what's the difference between G 052 162 A1 and G 052 162 A2 ATF?

one

[monkeytronic]

Quote, originally posted by CoolAirVw »

one

Well, besides the part number, that is.

Is the A2 fluid a full synthetic (or more synthetic semi-synthetic blend) compared to the A1 ATF?

Also given that BMW has used a RWD-only version of the 5HP24 in its 5-series and 7-series cars that called for Esso LT 71141 ATF is this another option that could be used in the A6 as well?

[monkeytronic]

Answering my own question:

The difference between both part numbers is the volume of the bottle they come in. They are actually the same ATF.

G 052 162 A1 = 0.5 L bottle (approx. 1 pint)
G 052 162 A2 = 1.0 L bottle (approx. 1 quart)

There's also...
G 052 162 A6 = 20L bottle (approx. 5-1/4 gallons)