Oil weight

Finally got thru to previous owner and he had been using Phillips XC 20W50 so I will keep using it as well.

When I put new cylinders on my engine, ECI mandated Phillips 20w50 for break in and continued use. It is like 20 when cold and 50 when hot. I have had perfect results for years and do not have to warm up a long time in cold weather.

Reading the C85 manual they call for SAE 40 when the temp is 40 or better and SAE 20 below 40. I can find SAE 40 single weight but am striking out on anything below SAE 40. All the multi weight oils seem to be 15W50 or 20W50. So---- what oil are you using when the temps go below 40?