I just changed the oil cooler lines on my 81 SD ,the bottom fitting on the cooler has very little threads left on one side of it .It snugged up but I found a used one so plan to install that.My question is I was reading a thread here that said the oil doesn't circulate until it reaches either 95c or 115 c depending on the thermostat used in the oil filter housing so if you have a cool running car and live in a cool climate as I do dose that mean the oil in the cooler sits there for years?seems like it might break down sitting?
William Rogers......