It's not normal nor acceptable...At least I wouldn't be pleased if this were happening with my Supra...
I've been using the standard 0w-20 oil in mine for over 2 years now and have never had to add oil to mine between each 8500 mile oil change intervals...
Had a '18 C7...Yeah, it was quick but not nearly as nimble and fun to drive as my Supra is...It was also surprising to me that my Supra seems to get far more attention and compliments then my Vette did!
Nice find...And gloss black is much nicer appearance than the CF options...
Also nice to see that cost is far more reasonable than the over priced rip-off options some other companies are offering!
I prefer living in a dry, warm, and sunny year round climate, which is why I chose to retire and live here in SoAz. And it's absolutely beautiful here! Cost of living, particularly homes, cost far less than where I was living in SoCal...I also don't miss the congested freeways!
But as always...