Thank you, Brian. Its just that the temperature was getting pretty high a while back when I drove it (granted, it was before I filled the head) and I get nervous about overheating far from home. I will start with shorter drives to see if the temp stays manageable.

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dannyf
1984 Mercedes 300 SD 214 K miles. Runs on WVO ~ 22 mpg over 8 K on WVO
1997 VW Passat TDI 156 K miles. Uses biodiesel and diesel. ~ 41 mpg
1996 Mercury Villager gasser. ~ 20 mpg