As to altisdualvvti question, the need to warm up is definitely there on the first start of the day. U can shorten that time to at least half during the rest of the day.
Agreed with above, except need to add to the part about switching to a 20W-40. It is still a 20W so starting and Warm up is the same. at 100'C, it will behave like a 40 weight oil, so yes, will be better than a 50 weight.