What type of battery does the bmw 530xi 2006 need

Check out the post on Bimmer forums.

https://www.google.com/search?q=2006+BMW+530xi+cam+torque+specs

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best thing is to buy a Chiltons manual for your car it has all the how to do stuff and for $20 it will save you time and hundreds of $.

on the front of the engine in the middle just under the intake manifold

Fuel Pump

Check the battery and see if voltage is dropping while you are trying to start it. Most likely the issue

It should be in your Manual, read it very carefully.

2006 bmw 530xi have a electric water pump (next to the thermostat). Common to go bad. There should be no heat in the car and "overheating" pops up. Electric water pump $495.00

I need a little more information to answer your question.
If your car has the 3.0L 6 cylinder engine;

Part Number: 48-72
Cold Cranking Amps: 730/Cranking Amps: 915/Reserve Capacity: 130

If your car is has the 4.7L V8
Part Number: 49-72
950 CCA/760 EN CA/100 AH Reserve Capacity

Both have a 72 Month P/R Warr 2yr Free Replacement warranty.

These are taken from the http://www.oreillyauto.com web site. However, I would recommend that you go to a quality battery vender.

If it's not under the hood, then the only other place BMW places their batteries is in the trunk. Since it's a Sport Wagon, pull up where the rear spare would be and it will be there, usually on the right hand side.

Hope this Helps,

~00 Buck~

"Still living on the Right Side of Dirt..."

Red cable on battery positive of your car
Black cable on engine or body for ground on your car

On dead battery car, cables both go to battery