RP Max ATF or Amsoil SS Fuel Efficient Trans fluid?

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Originally Posted by nthach
Originally Posted by nwoodco1


have the ZF HP626 in my LR3. I will be doing some towing but generally just around town.

ZF Lifeguard 6 or Ford Mercon SP. Do check the transmission's serial number, ZF did phase in Lifeguard 8 on the newer 6 speeds.

You could even go with Pentosin ATF-1 as it is approved by one of ZF's specs and claims compatibility with Lifeguard 6, caveat emptor.


If the op have a ZF6HP transmission he can definitely use Mercon SP,. I use Mercon SP in my Bmw that have a 6HP19 and it works great.
 
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Since it's between RP and Amsoil I would collect data sheets and see who has the better characteristics. Which one flows better, viscosity index, flash point, etc. Then if they are close decide which one you like better as far as company, reviews, price point and your own feelings on it. Most importantly use the one that has all specifications for your application.
 
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