Virtually all can-type coils are oil filled. If you can feel the oil sloshing around, the coil has lost some of the volume of oil it was manufactured with. I'd be prone to have a replacement unit handy to keep from getting stranded when (not if) it fails.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!