Coconut oil is also dirt cheap and will slowly add moisture back into the rubber.

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2008 Sport 4x4, Pro Comp D windows, 265/75R16's, leather, JVC double DIN, Kenwood 5-1/4 components, Clarion XR2420, 4 - 8" Dayton Audio SD215A-88 in 3.6ft^3 @ 38hz