Hi JCL,
Thanks for the info.
Before I place the order, I'd ask ECS to substitute for Mann filter.

Spark plugs were done by the dealer recently. There is no paperwork on recent brake fluid, or coolant. They may have been done by previous owner with an Indy.
I did have a BMW certified Indy do a 3 hour pre-purchase inspection, and he said everything was good.

I would leave the brake fluid flush for the dealer or an Indy to do, at the same time as the O2 sensors and gas filter gets done.

I'll need to add coolant to my shopping cart. Is 3 gallons of BMW OEM coolant enough for a 50/50 mix? I'd open the radiator and the engine block plugs to flush. I couldn't find info on how much water is in my 2006 X5 4.4i. Also checked page 154 of the manual.

Thanks,

Douglas