Z-ROD® 20W-50 Synthetic Motor Oil
Modern Technology For Classic Cars
AMSOIL Z-ROD Synthetic Motor Oil is
specially engineered for classic and high-performance vehicles. A
high-zinc formulation to prevent wear on flat-tappet camshafts and other
critical engine components, along with a proprietary blend of rust and
corrosion inhibitors for added protection during long-term storage.
AMSOIL Z-ROD Synthetic Motor Oil is specially engineered for classic
and high-performance vehicles. It features a high-zinc formulation to
prevent wear on flat-tappet camshafts and other critical engine components,
along with a proprietary blend of rust and corrosion inhibitors for
added protection during long-term storage. Z-ROD Synthetic Motor Oil
is designed to perform on the street and protect during storage.
AMSOIL, the leader in automotive synthetic lubrication, produced the
world’s first API-qualified synthetic motor oil in 1972. Trust the extensive
experience of AMSOIL, the First in Synthetics®, to do the best job
protecting your engine.
Protects Flat-Tappet Cams
The lifters and cam lobes on flat-tappet camshafts common to classic and high performance
vehicles slide rapidly against one another, producing high friction
and heat. The friction between the two components can eventually wear down the
cam and affect valve operation, ultimately resulting in lost engine power and reduced
efficiency. In addition, these areas are splash-lubricated rather than pressure lubricated
like other areas of the engine, which adds extra strain on anti-wear additives
like the zinc and phosphorus in zinc dialkyldithiophosphate (ZDDP).
AMSOIL Z-ROD Synthetic Motor Oil is formulated with high levels of ZDDP to protect
flat-tappet cams, lifters, rockers and other areas susceptible to wear. Its high-zinc,
high-phosphorus formulation provides the extra wear protection these critical splash-lubricated
Provides Long-Term Protection from Rust & Corrosion
AMSOIL Z-ROD Synthetic Motor Oil is formulated with a unique blend of rust and
corrosion inhibitors to ensure maximum protection during long-term storage. To prove
its effectiveness, AMSOIL submitted Z-ROD Synthetic Motor Oil to the Standard Test
Method for Rust Protection in the Humidity Cabinet (ASTM D-1748). This test evaluates
the rust-preventative properties of oil under high-humidity conditions, similar to those
faced by a covered hot rod in a damp garage. The metal coupon treated with AMSOIL
Z-ROD Synthetic Motor Oil showed no signs of oxidation after 192 hours, while the
coupon treated with a leading competitor’s product failed the test after 24 hours.
APPLICATIONS AMSOIL Z-ROD Synthetic Motor Oil is recommended for older
or modified engines requiring either 10W-30 or 20W-50 motor
oil. Z-ROD Synthetic Motor Oil meets API SL and earlier specifications, allowing for increased levels of anti-wear additives.
ZDDP levels in Z-ROD Synthetic Motor Oil exceed the limits of
API SM and newer specifications.
COMPATIBILITY AMSOIL Z-ROD Synthetic Motor Oils are compatible with
conventional and other synthetic motor oils. Mixing AMSOIL
Z-ROD Synthetic Motor Oils with other oils, however, will shorten
the oil’s life expectancy and reduce the performance benefits.
Aftermarket oil additives are not recommended for use with
AMSOIL Z-ROD Synthetic Motor Oils.
SERVICE LIFE Because engines in classic cars, hot rods and other performance
vehicles are generally modified, a universal oil drain
interval recommendation for these applications cannot be
given. Responsibility for determining the drain interval
duration rests with the owner. As a general service guideline,
the maximum drain interval for Z-ROD Synthetic Motor Oil
should not exceed 5,000 miles or one year, whichever comes
first. In heavily modified engines (e.g. forced induction, nitrous)
the maximum drain interval should not exceed 3,000 miles or
one year, whichever comes first.