I'm doubting that performance was the issue..... maintenance may have been. IH was making the switch to paper elements about that time. Plus, the automotive world was already using them. I'm sure they had some warranty claims due to the oil bath's being ran dry. The truth of the matter is, that an oil bath cleaner is far superior to dry... it's just messing and a pain to deal with. They do a much better job at filtration though.
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