Amphi miles vs hours

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We are debating when to change the Amsoil motor oil in our Amphicar.
We usually change oil by mileage; however with Amphi, we spend more
time on the water than we do on land. It is useless to try to keep
an hour log as often as we are in and out of the water. We are
wondering if anyone knows of a simple hour meter that may be attach
to our engine so that we may change oil by accumulative hours. We
try to change our street cars oil at 2500 miles. How many hours
relate to miles in Amphi and how many hours should elapse when using
Amsoil before changing the oil and filter?
Marty & Caryl
'64 Turq

Purchase an hour meter from J C Whitney. Attach it to the PTO light on
the dash. 50 hrs or less is a good figure= about 2500 miles. Have one,
works great. PJH