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Old 02-15-2013, 06:39 PM   #5 (permalink)
Burning oil to move air.
Join Date: Aug 2011
Location: Valencia (Europe)
Posts: 126

ausiasmobil - '06 Seat Leon 1.9 TDI Reference
90 day: 40.22 mpg (US)

EcoTxec - '99 Skoda Octavia 1.9 TDI 110 cv Laurin & Klement
90 day: 52.85 mpg (US)
Thanks: 92
Thanked 37 Times in 25 Posts
change your thermostat. Standard one begins to open 87C and gets full opened at 102C, equilibrium temp on 1.9 Tdi is arund 90.9C. (Tested from 0C to 45C)
Autodata software (maintenance database) says something about 80C thermstat in some TDI but I thing it's not true and maybe a mistake, because original parts for engines from 1997 (I/ve seen) to nowadays use 87C ones.

Your car is wasting fuel because of your thermostat opens at lower temps and maybe never closes at all.

If you were able to measure the fuel saving with upper grill blocks you will appreciate the big improvement of your thermostat change.


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