I'm not sure about Waser Boxers but Air Cooled are supposed to use some
oil.
The harder you work them the more oil  they use, up to a point .
When you're down to the final days before you change your oil you might
try lighting your dipstick on fire, as stupid as this may sound it works
to discover fuel blow by if the problem is severe.
If your oil smells like gasoline its also a good indicator.
I used a little more than a half quart in a recent 2000 mile trip with an
engine with 7000 miles on it and I consider this reasonable for 60%
mountain driving.

Stan Wilder
83 Air Cooled Westfalia Air Cooled.

On Wed, 29 May 2002 13:10:32 -0700 s w <smorewhisky@YAHOO.COM> writes:
> i never have to add oil between changes...even on a
> 3600 mile trip, used maybe a couple
> tablespoons...waiting for the other shoe to
> fall...i've never had a vehicle that did not use oil
>
> =====
> Scott Wilson
> 85 GL Westfalia
>
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