0-40W isn't too thin for winter use. Remember, that all oils are actually far thicker than we would like when cold.

I have forged pistons, which slap when cold. I have recently tried some 10W50 Silkolene Pro S, and have found it a little rattly about 2 mins after start till it gets warm. A number of people have said the same. I may try thr 15W 60, but not in winter. Quietest oil i've tried is Millers CFS 10W60.