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Discussion Starter · #1 · (Edited)
When filling the ZF with new fluid, you are supposed to top off first with engine off. After the fluid reaches operating temperature, then top off again. The question is how'd I keep the engine running on my e40 without having it shut off in order to reach the filing temperature?
 

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There may be other sofewares that can do this, I'm just not aware of them. I'd check with your independent mechanic to see if they have the software to do it or you might be able to down load it. Others may jump in here to give you better options.
 
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