N62 and M62 are very different motors. Each has their own bag of worms, the N62 being a bit more complex and difficult to work on.

Reliability wise, none of the motors are reliable... the 3.0 being the best option.

Aren't your gas prices insane in Canada?

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver