AMSOIL SAE 30 BREAK-IN OIL

AMSOIL SAE 30 Break-In Oil delivers competition-quality engine preparation for new and rebuilt high-performance and racing engines, seating piston rings quickly while protecting cam lobes, lifters, and bearings during the most punishing phase of an engine's life.

The first minutes and miles on a fresh build are when wear rates are at their highest. Cylinder walls still have sharp honing peaks, flat-tappet camshafts and lifters haven't seasoned, and rod and main bearings are under full stress without the benefit of mated surfaces. The oil you choose for this window has a direct impact on compression numbers, oil consumption, and whether your cam survives the first heat cycle. A standard off-the-shelf motor oil, loaded with friction modifiers, can actually prevent rings from seating properly and leave you chasing compression problems for the life of the engine.

FRICTION-MODIFIER-FREE FORMULA FOR FAST RING SEATING
Most synthetic and conventional motor oils contain friction modifiers designed to reduce drag and improve fuel economy. During break-in, that's exactly what you don't want at the cylinder wall. AMSOIL Break-In Oil is formulated without friction modifiers, allowing the sharp peaks on newly honed cylinder walls to partially flatten through controlled wear. This creates more surface area for the rings to seat against, forming a dynamic seal that increases compression, horsepower, and torque. Rings that don't seat properly allow combustion gases to blow past into the crankcase and let excess oil collect in the deep valleys of the honing pattern, driving up oil consumption.

HIGH ZDDP CONTENT PROTECTS CAMS, LIFTERS, AND ROCKERS
Flat-tappet camshafts and lifters are splash-lubricated, not pressure-fed, which makes them especially vulnerable during break-in before surfaces have hardened and mated. AMSOIL Break-In Oil contains high levels of zinc and phosphorus (ZDDP) anti-wear additives specifically calibrated for this critical period. This is particularly important for SBC, BBC, and other classic V8 rebuilds running flat-tappet cams, where inadequate ZDDP levels during initial startup and heat cycling are a common cause of cam lobe and lifter failure.

INCREASED FILM STRENGTH FOR BEARING PROTECTION
High-performance and racing engines frequently use aftermarket components that push torque and horsepower well beyond stock levels. Stroker kits, ported heads, and aggressive cam profiles all increase the loads placed on rod and main bearings. The added stress can rupture the oil film responsible for preventing metal-to-metal contact. AMSOIL Break-In Oil uses base oils selected for increased film strength, protecting bearings from damage even in high-output builds like 383 strokers, LS swaps, and dedicated drag or circle track engines. Four-ball wear testing (ASTM D4172) returned a scar diameter of just 0.43 mm, confirming the oil's ability to resist wear under load.

ROBUST THERMAL PROPERTIES FOR HEAT-CYCLE BREAK-IN
Proper break-in requires repeated heat cycles, bringing the engine up to operating temperature and letting it cool. AMSOIL Break-In Oil maintains its viscosity and protective properties across this temperature range, with a flash point of 230°C (446°F) and a fire point of 250°C (482°F). The viscosity index of 111 (ASTM D2270) indicates stable viscosity behavior from cold startup through full operating temperature, and the pour point of -36°C (-33°F) means the oil flows readily even during initial priming in cooler shop conditions.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL SAE 30 Break-In Oil is designed for new and rebuilt high-performance and racing engines requiring SAE 30 viscosity during break-in. It is suitable for flat-tappet and roller cam engines, including small block and big block Chevys, Ford Windsor and FE engines, Mopar wedge and Hemi builds, LS-series engines, and other domestic and import performance platforms. It is also appropriate for new generators, powersports engines, and other small equipment where a proper break-in period is recommended before switching to a full synthetic oil.

SERVICE LIFE
Break-in duration varies between engines, but AMSOIL Break-In Oil should not be used for more than 1,000 miles (1,600 km). Follow the engine builder's or manufacturer's break-in recommendations when available. After completing break-in, drain the oil and fill with a high-performance AMSOIL synthetic motor oil that meets the builder's or manufacturer's specifications. Common indicators that rings have seated include reduced oil residue at the exhaust ports, stable leak-down test results, and consistent horsepower measurements over successive runs.