The Original Synthetic Oil
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Copyright 2008 All Service Oil All Rights Reserved
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AMSOIL Synthetic Z-ROD Motor Oil (ZRT & ZRF)
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Package sizes include:
1-Quart Bottle
1-Quart Bottles (case of 12)
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 components require.
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.
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.



10w-30
20w-50