Welch 1402 advice Please
In article , Dan Caster says...
probably non-detergent and I am pretty sure it was a single grade oil
like SAE 30 ) in a vacuum pump.
Many of the older piston pumps used straight-weight motor
oil. Actually a check of a leybold, alcatel or pfeiffer
vaccum site might pin down the answer to this question.
Jim
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