Wish I'd read this thread last week. I just changed my oil and put in 5W30 M1.... now, I'm having serious second thoughts. What is the big issue with the 30W? I live well N of the 49th parallel and its cool up here most of the time. Putting in the 5W made my noisy lifters quiet right down and things are running ever so smoothly.
Is this a big enough issue that you'd recommend I drain and refill with thicker oil before next Spring?
:chicken: