Comp Cams Engine Break-In Oil Additive 12 oz. Bottle — Controlled Friction Formula for Ring & Cam Bedding

Comp Cams 159 Engine Break-In Oil Additive is a formulated 12-ounce concentrate designed to support controlled engine break-in when mixed with base oil.

When assembling or rebuilding an engine, the initial running period is critical for seating rings and bedding new components. Comp Cams 159 provides a purpose-built chemical blend to be added to fresh oil, helping create the correct friction characteristics and film strength recommended during the break-in phase. This additive is packaged in a compact 12 oz. bottle for easy dosing and storage.

How does this additive help during the engine break-in period?

Comp Cams 159 alters the oil chemistry to promote proper mating between moving parts without using extreme detergency or slip-reducing agents that can prevent ring seating. It encourages a controlled level of friction and surface interaction, which many builders prefer for effective ring and cam lobe bedding.

• Formulated specifically for initial running conditions.
• Mixed into new engine oil at the manufacturer-recommended ratio.
• Designed to avoid over-lubrication that can hinder component seating.

How do I use the 12 oz. bottle correctly?

Measure and add the Comp Cams 159 additive to the engine’s fresh oil before the first start, following the dose instructions provided on the bottle or assembly guide. After the prescribed break-in interval, drain the oil and replace it with the engine’s normal service oil to continue regular operation.

• Shake bottle before use to ensure even dispersion.
• Add to clean, new oil prior to first engine start.
• Complete the break-in sequence, then change the oil and filter.

Will this work with performance cams and hydraulic lifters?

The additive is suitable for a wide range of cam profiles and valvetrain types; it aims to balance lubrication and surface interaction during the bedding-in process. For highly specific cam chemistry or extreme performance applications, consult the camshaft manufacturer’s break-in recommendations and combine practices as appropriate.

• Compatible with many aftermarket cam and lifter combinations.
• Use alongside maker-specific break-in steps when required.
• Helps minimize risk of improper seating for common rebuild scenarios.

Is the product safe for modern oils and engine materials?

Comp Cams 159 is intended to be added to conventional break-in oil formulations and should be compatible with typical engine materials used in pistons, rings, and cam surfaces. Always confirm compatibility with your oil type (conventional vs. synthetic) and the engine builder’s guidance before use.

• Designed for temporary use during initial run-in only.
• Follow oil change interval after break-in to remove additive residuum.
• Check material and oil compatibility for special alloys or coatings.

Who is this product for? Comp Cams 159 Engine Break-In Oil Additive is for engine builders, hobbyists, and professional mechanics performing assembly or rebuilds who want a dedicated break-in chemical to control lubrication characteristics during the critical first run hours. It suits street and performance engine projects where a controlled bedding-in approach is part of the assembly procedure. If you prefer to follow factory or camshaft-maker break-in protocols, use this additive only when it aligns with those instructions and change to standard engine oil after the break-in period is complete.