Lucas Oil 10063 Engine Break In Oil Additive with TB Zinc Plus is a specialized product designed to enhance the performance and longevity of new engines, particularly those with flat tappet camshafts. This additive is not just for high-performance race cars but also proves beneficial for everyday vehicles and even lawn mower engines.

Users have praised its effectiveness in seating new rings properly, which is crucial for optimal engine performance. The additive's formulation includes extreme pressure additives that protect the valve train and camshaft, making it a reliable choice during the break-in period of any engine.

Feedback from users highlights its versatility and cost-effectiveness. One user mentioned saving $7 by purchasing on Amazon compared to local auto shops. Another user shared their experience using it in a brand new GMC V8 engine, noting a smooth break-in process followed by regular oil changes without further need for zinc additives.

For those with older engines or specific needs like breaking in a new generator without voiding the warranty, this product comes highly recommended. Its ability to work well with both conventional and synthetic oils adds to its appeal across various applications.

In conclusion, whether you're dealing with an old-school Mopar motor or ensuring your new equipment runs smoothly from day one, Lucas Oil’s additive offers protection and performance that can help extend the life of your engine significantly.