BR40 10w40 Break-In Oil Conventional Case 12x1Qt

The BR40 10w40 Break-In Oil Conventional Case 12x1Qt from DRIVEN RACING OIL is purpose-formulated for the critical first hours of operation when new or freshly rebuilt engines are most vulnerable to wear. Whether you're assembling a high-performance build, running fresh rings and bearings, or commissioning a complete engine overhaul, break-in oil plays an essential role in establishing proper ring seating and protecting valve train components during startup. This conventional formulation is engineered specifically for engines that require elevated zinc and phosphorus levels—exactly what flat-tappet camshafts and lifters demand during the crucial break-in window.

DRIVEN Racing Oil's BR40 delivers a 10W40 viscosity that balances rapid oil circulation during cold engine starts with robust film strength at operating temperature. The conventional mineral base resists volatility loss during high heat cycles, while the anti-wear package—loaded with anti-scuff additives critical for fresh metal surfaces—protects cams, lifters, and bearing journals when boundary lubrication conditions are at their worst. Unlike standard service oils, break-in formulations prioritize protection over extended drain intervals, ensuring that microscopic high points on newly honed cylinder walls, fresh valve seats, and raw bearing surfaces remain bathed in protective film during the first 500–2000 miles when wear rates peak and detergent demand is highest.

This case of twelve 1-quart bottles suits rebuilders, performance shops, and serious enthusiasts who demand peace of mind across multiple builds or track seasons. The BR40 is ideal for carbureted engines, traditional pushrod designs, and any application running mechanical or flat-tappet cam profiles—especially critical for high-lift or radical cam grinds where lifter pressure spikes demand superior anti-wear chemistry. Once break-in is complete and the engine is properly seated, transition to your chosen long-term service oil; the BR40 has already completed its mission of protecting the most vulnerable stage of engine life.