Regarding the transmission fluid, the big driveline change happened for 2006 model year for petrol models, so I assume yours is the earlier BMW-engined 4.4 V8 with the 5-speed transmission (ZF 5HP24). The only fluid you should put in your 5HP24 is one of these:
Here in the UK, Mobil ATF LT71141 is the easiest to source but I suspect that, in the USA, it’s probably easier to get hold of ZF Lifeguard Fluid 5 or maybe Pentosin ATF1.
Esso LT71141 was rebranded to Mobil ATF LT71141 many years ago.
The packaging for Lifeguard Fluid 5 has recently been updated by ZF:
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Phil
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