- Objective:
- Maximum fuel efficiency
 
 - Fits:
- all AHU/1Z TDI's
 - ALH
 - All older IDI's
 
 - Part Numbers:
 - In use/Tested By:
- David on his 1991 VW GTI TDI swap
 
 - Alternative:
- stock 87° Thermostat
 
 - Comments:
- Low operating temperature is known to hurt MPG, but there is no solid proof that higher temperatures will improve efficiency.
 
 
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