The part of Ontario I live in gets hot summers hence the 15-40, and fairly cold winters. I got the car in thew middle of last winter and starting was annoying, it had to be plugged in for a couple hours (stock block heater) for the first morning start, and then fired up every 4 hours or so afterwards. The glow plugs were 12 year old loops and the valves had not been done for 12 years though. Valves are now being done properly, and I'm putting in pencil "conversion" plugs in the fall.

If the 5-40 weight iol doesn't make a big difference when starting I might just stay with the much cheaper 15-40, hell it will allow more frequent oil changes!