Comp Cams Engine Break-In Oil Additive 12 oz — ZDDP & Moly Anti-Wear Formula for New/Rebuilt Engines

COMP Cams 159 Engine Break-In Oil Additive is a ready-to-use, ZDDP-enriched 12 oz formula designed to protect and optimize new or rebuilt engines during initial run-in without needing extra supplements.

Modern engine oils often lack the high levels of anti-wear chemistry that engine builders and performance enthusiasts rely on for safe break-in and long-term valve train protection. COMP Cams created this mineral-based, multi-viscosity break-in oil with a balanced additive package—zinc & phosphorus (ZDDP), molybdenum, detergents and a quality base oil—to assist surface mating and reduce wear on critical areas through the most vulnerable operating hours. It’s formulated to work with gasoline, methanol and high-octane racing fuels and is ready to use straight from the bottle.

How does this oil additive help during engine break-in?

This product improves surface mating of freshly machined components, helping rings seat and cam/lifter faces wear-in predictably. The ZDDP and molybdenum create an anti-wear film under high contact pressures, while detergents maintain cleanliness during initial operation.

• Promotes controlled wear on cam lobes, lifters and flat tappet surfaces.
• Helps piston rings achieve proper sealing faster for better compression.
• Reduces risk of premature scoring on rod journals and valve guides.

Is this oil ready to use or does it need mixing with other additives?

The COMP Cams break-in oil is fully formulated and requires no additional supplements. It’s a multi-viscosity mineral-based product intended to be used as supplied for break-in and initial running periods.

• No extra ZDDP or moly additions required.
• Compatible with common fuels including gasoline, methanol and high-octane race blends.
• Works as the engine’s primary oil during the controlled break-in phase.

Which engine components get the most benefit from this formula?

The additive targets high-friction and high-load surfaces where mating must occur precisely. Components like flat tappets, cam lobes, piston rings, rod journals and valve guides are the primary beneficiaries of the anti-wear package.

• Flat tappet and roller valve trains—improved protection during initial contact.
• Rotating assembly—reduced scoring on journals and bearings under break-in stresses.
• Piston rings and cylinder walls—better seating and reduced blow-by during early hours.

How should I use the 12 oz bottle for best results?

Use the bottle per the engine builder’s instructions for break-in volume and procedure. One 12 oz bottle is often sufficient as an initial treatment for small-block and many performance engines when added according to recommended ratios or used as the primary break-in oil in appropriate crankcase capacities.

• Add per your engine or machine break-in procedure—follow COMP Cams or builder guidelines.
• Monitor oil condition and temperatures during the controlled run-in period.
• Change to a regular high-quality oil after break-in or as recommended.

Who is this for: COMP Cams 159 Engine Break-In Oil Additive is aimed at engine builders, performance hobbyists and racers who assemble, rebuild or upgrade engines and want a purpose-built break-in lubricant that contains the correct anti-wear chemistry. If you work with flat tappet cams, high-performance rotating assemblies or run on race fuels and need a ready-made ZDDP-enhanced oil to protect vital surfaces through the first running hours, this 12 oz formula is designed for that application.