Performance Break-In Oil is specifically designed for breaking in engines with flat tappet camshafts, roller elements or where elevated levels of anti-wear additives are needed. Complex 2X Zinc structure protects for an extended temperature range, outperforming conventional break-in oils. Approved for use in high-performance engines including Off-Road, Circle Track, Late Model, Drag, Grand Am, etc. Compatible with petroleum, semi-synthetic and fully synthetic motor oils. Ideal for use in Race Engines, OEM Rebuilds and Crate Motors. Not recommended for street use. AVAILABLE IN 15W-50 ONLY.