There was an article in Motor Home mag. about care of slides can't remember which article but within the last year. Article stated not to use products that contain petoleum products, which, I suppose would rule out WD-40 and 3-in one oil. Alpine tech said they used silicone spray lube, have to find one that does not contain petroleum products. Don't use one that contains teflon, I did with bad results, ate up the seals and damaged the paint on the bottom of the slide and caused grey marks on the carpet in front of the sofa. 01 Alpine MDS 37' 330 cummings
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