Comp Cams Engine Break-In Oil Additive 12 oz — promotes piston ring seating & cam conditioning

Comp Cams 159 Engine Break-In Oil Additive is a concentrated 12 oz. formula designed to help new and rebuilt gasoline engines run-in smoothly and promote proper piston ring seating during the initial break-in period.

When assembling or installing a new or rebuilt engine, the first few hours of operation are critical for ring seating, cam and lifter conditioning, and minimizing early wear. This Comp Cams break-in additive is formulated to be mixed with conventional break-in oil to provide the controlled friction and film properties needed for correct ring bite and cam activation without long-term residue. It supplies a temporary, high-friction profile that slowly disperses as the rings seat and the engine completes its break-in cycles.

How do I use this product during first startup?

Use the entire 12 oz. bottle mixed into the recommended volume of conventional break-in oil for your engine — typically in the sump before the very first start. Follow Comp Cams or your engine builder’s break-in RPM and duration guidelines to ensure safe seating and reliable performance during the run-in period.

• Add full 12 oz. to the specified quantity of break-in oil in the crankcase before initial startup.
• Start and run the engine per manufacturer or builder instructions for controlled RPM and load.
• Change the oil and filter after the prescribed break-in interval to remove contaminants.

What benefits does this additive provide for new rings and cam lobes?

The additive creates a temporary friction and film balance that helps rings form a better seal against cylinder walls without excessively reducing contact required for seating. It also supports controlled cam and lifter break-in by minimizing abrasive particles and providing a conditioning film during the critical early hours.

• Promotes improved piston ring seating for better compression and reduced blow-by.
• Helps condition cam lobes and lifters by controlling early wear characteristics.
• Formulated to blend with conventional break-in oils and be removed at the first oil change.

Is this compatible with synthetic oils, additives, or performance parts?

Comp Cams 159 is intended for use with conventional break-in oils rather than full synthetics; consult your engine builder for any exceptions. Avoid mixing multiple specialty additives unless specifically recommended, and always follow parts manufacturers’ guidance for lifters, cam profiles, and coatings.

• Designed primarily for conventional break-in oil systems used during initial run-in.
• Check compatibility with coated camshafts, roller lifters, or nonstandard materials before use.
• Do not rely on it as a permanent lubricant — perform the recommended oil and filter change after break-in.

How do I know when to change the oil after using this additive?

After completing the prescribed break-in routine (time and RPM/load per your builder’s instructions), drain the oil and replace the filter. Changing the oil removes the break-in additive and captured debris, returning the engine to normal lubrication with the chosen long-term oil.

• Complete the full engine break-in schedule before performing the oil change.
• Drain oil, replace filter, and refill with your selected long-term engine oil grade.
• Inspect for metal particles or abnormal residues and consult your builder if found.

Who is this for: Builders and enthusiasts installing new or rebuilt gasoline engines who want a purpose-built, temporary break-in aid to support piston ring seating and cam conditioning. Ideal for street and performance engines that use conventional break-in oil and follow a recommended run-in procedure, and for engine shops that perform controlled first-run protocols.