I have a Mastercool 90059 pump . It is 5 years old but has only been used 3 times . The oil was changed after each use for long term storage . yesterday I was running the pump and noticed a light amount of smoke coming from the combination oil fill / exhaust port . I do not remember seeing that before and was wondering if it was normal for 90059's to do that . Thanks in advance for any advice .
Wisps of visible vapor from the exhaust is normal.
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