Hi

Check the oil pressure relief valve and clean it.

Try a heavier grade of oil, not one of the modern wide range synthetic or
semi synthetics multigrades.

30 or 40grade or possibly a 20/50 I would stick with a mineral oil for an
engine of this age.

Castrol make an oil for older higher mileage vehicles but I expect it is not
available where you are.

Alec


"David L. Martel" wrote in message
...
hookipa,

A sticking oil pressure relief valve would cause these symptoms.

Dave M.