[Docbarleypop]

a side note, worked for a large overhead door company in Mn for awhile. We used regular motor oil to lubricate both springs and rollers on exterior doors. Its the only thing that worked in both the extreme heat and extreme cold of Minnesota. I now use filtered used oil on the rollers at home

[PeterPrinciple]

I now use filtered used oil on the rollers at home

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how are you filtering it?