15/40 has a cold pour point like 30 oil.I cant use 15/40 in my Ford pickup.Erratic oil pressure readings and raps on startup made me drain the 15/40.10/ 30 stopped the noise.Owners manual says 15/40 is ok above 32 degrees.195,000 miles and a worn oil pump can make a difference.My wife had a high milage 89 Mercury that did the same thing with 15/40 when the weather turned cold.If you thing 15/40 is good put a sample in a jar into the freezer.Put a sample of 10/30 along side it and come back and tell us what you saw.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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