Just a heads-up as per SI B61 30 14
General Electrical Systems January 2015
Technical Service

Vehicles with N63 engines require additional cooling capacity, and the activation of the various cooling system components places additional demands on the battery.

Several enhancements have been made to the power management system on such vehicles. However, in a quest to ensure total customer satisfaction, please replace the 12-volt battery on a preventive maintenance basis at every engine oil service (engine oil service counter # 1, # 2, # 3, etc.), unless the battery was replaced within the last 12 months.

Note: The Key Reader/ISPA Light application will not show a “combined” battery replacement with engine oil service counter # 1 and # 3. Disregard this and replace the battery while performing the engine oil service.

Vehicles with an N55, N57, N63T, S63, or N74 Engine

To ensure total customer satisfaction, please replace the12-volt battery on such vehicles at the second engine oil service (with the engine oil service at counter # 2) only, unless the battery was replaced within the last 12 months.

So, every 2 oil change, you could get a new battery. I don't know if this works with CPO or even in Canada but probably worth a try