I have been using 15W-40 in my 500cc B&S Intek single for the last 5 years mounted in a Craftsman riding mower. Since you didn't say otherwise, I'll guess you have the same. Use it with confidence, you won't be sorry unless you want to start at less than 10F. If your engine has an oil filter, I'd suggest to just buy the cheapest automotive filter you can fit. I use Motorcraft FL-400 or equivalent. Much, much cheaper than $10 for a B&S filter.