AMSOIL Break-In Oil is an SAE 30 viscosity grade oil formulated without
friction modifiers to allow for quick and efficient piston ring seating in
new and rebuilt high-performance and racing engines. It contains zinc
and phosphorus anti-wear additives to protect cam lobes, lifters and
rockers during the critical break-in period when wear rates are highest,
while its increased film strength protects rod and main bearings from
damage. AMSOIL Break-In Oil is designed to increase compression,
horsepower and torque for maximum engine performance.
Quickly Seats Rings
The primary goal during engine break-in is to seat the rings against the cylinder
wall. Properly seated rings increase compression, resulting in maximum horsepower;
they reduce oil consumption and prevent hot combustion gases from entering the
crankcase. To achieve this, however, the oil must allow the correct level of controlled
wear to occur between the cylinder wall/ring interface while maintaining wear protection
on other critical engine parts. Insufficient break-in leaves behind peaks on the
cylinder wall that prevent the rings from seating. The deeper valleys, meanwhile, allow
excess oil to collect and burn during combustion, increasing oil consumption. Too
much wear results in cylinder glazing due to peaks rolling over into the valleys and
preventing oil from collecting and adequately lubricating the cylinder wall.
AMSOIL Break-In Oil’s friction-modifier-free formula allows the sharp peaks on newly
honed cylinder walls (fig. 1) to partially flatten. The result produces more surface
area for rings to seat against, allowing formation of a dynamic seal that increases
compression, horsepower and torque (fig. 2).
Protects Critical Parts from Wear
New flat-tappet camshafts and lifters are not seasoned or
broken in and must be heat-cycled to achieve proper hardness.
During the break-in period, these components are susceptible
to accelerated wear because they are splash-lubricated,
unlike other areas of the engine that are pressure lubricated.
AMSOIL Break-In Oil contains high levels of zinc and phosphorus
(ZDDP) additives designed to provide the anti-wear
protection required during this critical period.
Increased Film Strength
High-performance and racing engines often use aftermarket
parts designed to increase torque and horsepower. The added
stress can rupture the oil film responsible for preventing harmful
metal-to-metal contact on rod and main bearings. The base
oils in AMSOIL Break-In Oil provide increased film strength to
protect bearings from wear.
AMSOIL Break-In Oil is designed to effectively break in high-performance
and racing engines requiring SAE 30 oil, helping
maximize compression, horsepower and torque.
The engine builder’s or manufacturer’s break-in recommendations
should be followed if available. Break-in period should
not exceed 1,000 miles. When the engine is new, the exhaust ports will have a large area of oil residue (Fig. 3). As the
rings begin to seat, less oil is passed and the oil residue
area begins to shrink (Fig. 4). When the rings are fully seated
and have formed a tight seal against the cylinder walls, no oil
residue will be evident. Other common methods to determine
if rings have seated include performing a leak-down test or
horsepower measurements over time. Break-in duration will vary
between engines. Afterwards, drain and fill the engine with an
AMSOIL high-performance synthetic oil that meets builder
or manufacturer specifications.
HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended
application and according to the recommendations in the Material
Safety Data Sheet (MSDS). An MSDS is available via the Internet at www.amsoil.com
or upon request at (715) 392-7101. Keep Out of Reach of Children. Don’t pollute.
Return used oil to collection centers.
For warranty information, visit www.amsoil.com/warranty.aspx.