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Old 09-20-2021, 04:36 PM   #5
CastIron
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Join Date: May 2013
Location: Oregon
Posts: 330
Re: Window sash lubrication

I've replaced a lot of side windows on a lot of different cars and always lubed window regulators with Valvoline synthetic grease. It sticks and doesn't get hard, even in cold temperatures. For the glass run channels, I always clean them really well and wipe on a tiny amount of silicone lube. Doing that will even make an old window work better than a new car.
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