2017-2026 Duramax L5P Ultra Slim Oil Fill Cap

We have found that using the traditional oil cap with the oil fill tube (last picture for example) on 2017-2019 trucks will interfere with the hood insulation, so we've come up with an ultra slim oil cap to remedy that! This cap will also work on a standard 2020-2026 L5P and drop right in place of your existing cap for a cool little engine bay modification. The John C Garage ultra slim cap does include a brand-new sealing oring that comes pre-installed on the cap!