So the engine manual calls for 5w-30 for ambient temperatures -20 to 30degrees F, and 10w-30 for 5 to 100degrees F. (Ariens AX LCT 291cc) Seems like everywhere I look, people are using and recommending 5w-30. Most of these people live in places that aren't typically in that -20 to 30deg range. Common sense tells me that using an oil suitable for such a broad spectrum of temps must be compromised in some other way. Am I missing something?
In regards to synthetic vs. conventional; does a synthetic 5w-30 broaden the operating range at all?
I posed these questions to LCT a few weeks ago but no luck in getting a reply.