When I owned my last 2 vettes, I used Mobil 1 like the owners manual said if not voided the warranty. Same as Hell Cats, different oil, but change every 6 months. H/C just uses a different oil. Use it till out of warranty then burn what ever makes your car happy. Mine has been weined on Penz oil and will stay that way. I have an extended warranty. Dooo cause. Fee oil changes,,, right, not free.