>> I have recently purchased a 1979 Westfalia with the 2.0 liter motor 
>> and a manual transmission.  Becasue there is no tach, I have no idea 
>> what a safe, long trip highway speed is.  Can I cruise at 65 with no 
>> worries?  Can I go faster (downhill with a tail wind :) )?  Please let 

>As I understand it, in air-cooled engine's, increased speed equals
>increased heat equals damaged valves.  All literature I have read saya
>stay at or below 65mph.

I often drove my '78 2.0l at 70-75mph on lonnnng trips, 10-12hrs. straight.
Ran happily. Did the same in my '72 1.7l.  Just use 20W50!!!  Gas mileage
_really_ suffers over 60-65mph though.   tim