I noticed the same thing with mine. It was actually below the low line cold on mine. So I added some when I got the boat out from winter storage. I have only had it out twice since then, and I need to check it again.
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2018 Moomba Craz
6.2L Raptor 400
6 Pump Ballast, Autowake 2.0, Flow 2.0 Surf System
OJ 15x13 Wake Prop
Digital Cruise Pro 3 (paddle wheel)
Wetsounds Rev 10's
2005 Supra Launch 22SSV - Sold