Lucas Oil's 10063 Engine Break In Oil Additive with TB Zinc Plus is a specialized product designed for new motors and those with flat tappet camshafts. This additive is particularly beneficial for race applications, providing extreme pressure protection that ensures faster break-in and reduced blow-by.

Users have praised its effectiveness in older engines, particularly those with flat tappet cams. One user mentioned using it to break in lawn mower engines, noting that it helps cylinder walls and rings seat properly. Another user highlighted its cost-effectiveness, being cheaper on Amazon compared to local auto parts stores.

For new engines, such as a brand new GMC V8, the additive was used during the initial break-in period, followed by an oil change after 1000 miles. The user noted that zinc additives are primarily beneficial during the break-in phase and planned to switch to regular oil changes thereafter.

Additionally, some users have explored its use in new generators to aid in the break-in process without voiding warranties. The product has also been well-received for its packaging and fast delivery service.

Overall, Lucas Oil's 10063 Engine Break In Oil Additive is a reliable choice for both new and older engines requiring enhanced protection during the critical break-in period.