The window tinting law in British Columbia in the BC Motor Vehicle Act Regulations section 7.05(8) states that:
No person shall drive or operate on a highway a motor vehicle which has affixed to
or placed on the windshield or a window any material that reduces the light
transmitted through the windshield or window unless the material is affixed to or
(a) the windshield but not more than 75 mm below the top of the windshield
(b) a side window that is behind the driver, or
(c) the rear window if the motor vehicle is equipped with outside rear view
mirrors on the left and right side of the motor vehicle.
In other words, no tint is allowed on windshields below 75 mm from the top and no tint is permitted on the driver’s side windows, right or left—the front side windows. Tint may be installed on the side windows behind the driver—the rear side windows. Tint may be applied to the rear window, provided the vehicle has two exterior rear view mirrors.
Oil change I would do it prior to the winter season.