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Rob, I used black foam pipe insulation stuffed between the VW grill bars for a quick, easy upper grill block. This is sold in the U.S. in hardware stores to insulate plumbing pipes. I thought I would try it temporarily to see if my Golf ran too hot because it is easily removed. It didn't overheat so it has stayed for 3 years. As others have stated, the diesel runs best when fully warmed up. In winter I split some pipe insulation to block off some of the bottom grill too. This helps the car warm up quicker. These engines are very efficient and don't heat up in winter like gasoline engines.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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