I've played around with both the 80c and 87c thermostats with my '82 D24 NA.
I have not noticed any real difference between the two in regards to oil temperature and fuel economy during my daily driving (Not scientific, just eyeing my gauges while driving, etc...)
Personally, I've stuck with the 80c thermostat because it gives an additional buffer in case things decide to get hot (such as going up Mountains)
Can anyone else testify to the real world differences between the two thermostats for daily driving?
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