Quote:
Originally Posted by NeilBlanchard
I think that filling up to the flap would be better, but is still prone to trapped air bubbles.
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Yes, I thought about that -- that's why I think it would be more accurate not to fill up into the neck - much less chance for air traps, don't you agree? Also, as Robert suggests, for sure the car should be level, or at least parked in the same position for both fills.