Quote:
Originally Posted by Davidf
I disagree with the fluid substitution and have been using cheaper substitutes for over 10 years with no ill affects. Many of my transmissions have gone well over 100k miles with other than ZF fluids. Ford didn't use the ZF fluid either.
Do you have first hand knowledge that using something other than ZF Lifeguard is "not good"?
Edit: ...maybe I am mis-reading your post. OE equivalent fluids are many and does not mean ZF Lifeguard. Fords "SP" fluid is an equivalent fluid as are many others on the market. With that said, ZF Lifeguard fluid is a very high quality and heat resistant fluid...thus, it probably has a longer life than many other "equivalent" fluids. So, I change fluid about every 60k miles.
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I do not have personal experience with using a different fluid. With a pan and filter change there's a lot of fluid still in the transmission so I would not want to mix another fluid with it.
I imagine you did a complete drain including converter and then filled with all new correct?