I'm no engineer, but I'm still not sold on this thermostat thing.
To me your engine temp is "just that". If your water temp is 190, then
your oil (as it curculates thru your block) should be close to the same temp.
Which tells me that the oil is getting hot enough to "burn the impurities"
out of it. Plus I change my oil twice a year anyway with very few miles.
My new Dodge truck has an oil cooler - I dont see a thermostat nor am I
aware it has one and Dodge suggest 6k mile oil changes.
All that being said: I've been wrong plenty of times before and will most
likely be wrong again in the future - So I'm all ears.
WB


'93 Unique 427/351W/4sp