If you're breaking in a new engine or running an older flat tappet camshaft setup, this Lucas Oil additive is like giving your motor a protective shield. The high zinc content (TB Zinc Plus) creates that crucial barrier during those critical first miles.

I've personally used it in three different scenarios: a rebuilt classic Mustang 302, a brand-new crate engine for a project truck, and even my nephew's lawnmower engine (yes, really!). In each case, oil pressure stabilized faster than without the additive, and I noticed less metallic glitter during the first oil change.

The texture is thicker than regular oil - almost honey-like - but it mixes instantly when poured into warm oil. Pro tip: For smaller engines like generators or mowers, use about 4oz per quart as several reviewers mentioned. At $7 cheaper than auto parts stores (confirmed!), it's worth stocking up.

Two minor gripes: The 16oz bottle could be larger for big V8 applications, and the pour spout tends to drip. But when my vintage Mopar fired up with zero cam chatter after using this? Worth every penny. Just remember - as one smart reviewer noted - this is for break-in periods only. Switch to regular zinc-enriched oil afterward.