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what brand and grade of conventional oil was used? What part of the country is the car in? Temperatures make a difference as does what design mixture the oil has. Conventional oil isn't that expensive, so dropping it now and replacing with a recommended and/or proven synthetic oil for these cars is what I'd do if it was mine. You could do damage running the wrong oil (too thick, too thin etc). 9 qts cheap oil $30. 9 qts synthetic oil $150. New engine $20,000
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Tony G
10 Porsches come & gone!
1962 Morgan Plus 4 
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