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My first question is which transmission do you have? For automatics .... ZF8HP or ZF6HP? The zf8-speed is a bit more specific when it comes to fluids. The safest option is to use ZF Lifeguard 8. However I've read that LM Top Tec 1800 is a good alternative as well. FCPEuro prescribed them as a cheaper option to the ZF.
Do a search and you can find other alternatives.
The ZF6HP being an older tranny, you can find many options apart from ZF Lifeguard 6. Those includes the Top tec 1800, Valvoline Maxlife, Castrol Synthetic MV LV spec, Redline D6.
Re: Pan, I think it is a good idea if it's your first time as it would have accumulated quite a bit of wear particles from new. After that, you may opt for a drain/fill for the next round. Be sure to use the same brand of fluid. Not sure if it's a good idea to mix fluids.
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