It's critical only this ATF is used in the HP20 and it's only made by Mobil - there is no substitute and the use of anything else, especially Dexron, can compromise the life of the 'box.
In 20 litre drums but this represents quite good value for the genuine stuff...
I’ve just ordered a drum.
20l is a lot of LT71141 for just one gearbox as it'll do about five changes but if you know friends with them too then it can represent a good group buy. It's even cheaper if you buy two or more drums
And as Simon (Mandrake) has found over on the FCF, a few flushing changes can make a big difference :wink:
For HP18 owners, this mob also does some good deals on Dexron II in great bulk...