Lakeside53
Stihl Wrenching
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Stihl's earliest HD filter set-up (the metal-caged pleated oil-type) that came out here in 1986 actually worked quite well, and was the gold standard here for years.
I forgot about that one... I get them in on big saws - either completely packed (never put the felt prefilter on when the original foam outer disintegrated), or like new...
They do get real cruddy - and are a bi?ch to clean. Most forgot to oil them anyhow..