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Speedy Jim

wrote:

I am prepared to think it is anything in the entire system, hence the
adjustments of the cycles per hour

As for the oil supply line, yes it is one line. The tank is indoors
(basement).

With regards to the pressure, when the service guy tested the pressure
he mentioned that it was 100psi. Can the oil delivery pressure be
affected by the temperature?

marc

No, the pressure is tightly controlled by the internal regulator
in the pump.
The critical point isn't the exact value of the pressure,
but rather how promptly the pump builds pressure precisely
at start-up.
If the thing sputters for a few seconds once every 20 starts,
that's when you will have a shutdown. Very elusive.

Jim