Even if the CCV looks normal cn90 I'd replace at that age. I replaced my 10 yr old CCV and dipstick guide tube this year (to cold weather parts) and haven't consumed any oil to date. Even if it's looking functional I think due to age there can be some buildup causing oil consumption.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards