.404
The Ramster
That makes sense, with the much higher film strength of the ester oil.
Here's a barnburner: I turn all my used oil from diesel pickups, skidsteer, skidder, excavator... etc. larger quantities of synthetic oil than you get out of a car, plus also car oil changes to a friend who runs an upholstery and hot rod fabricating business. All synthetic. He heats his shop with a waste oil burner, I believe it is a, "Reznor." Anyhow, he goes through something like 7-8 gallons a day of conventional oil from other sources in there and trust me, it is toasty.
Now you know tightwaddedness is the main gripe with guys who refuse ester oils its due. But when my shop-owner buddy uses 15w40 and 5w30 out of my barrels, he uses less than 5 gallons per day. Same cold weather same toasty shop. Which oil has more BTUs in practical terms......?
Edit: He also states no clogging problems in the nozzle from my clean syn which is a stumbling block for waste oil heaters by and large.....