Top end lubes helped remove carbon deposits than modern TOP TIER fuel already have as an additive. They are no longer needed IMHO, unless you insist on running spot market fuel.

Ducit Amour Hybridae
Mark Smith
Master Certifited Technician
Tempus non reparabilis fugit
"It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it."

Best Tank 35.0 MPG