
Z-ROD® 20W-50 Synthetic Motor Oil
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.
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 such as 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.
Engineered for classic vehicles
High-zinc formula
Protects against rust during storage

Provides Long-Term Protection from Rust & Corrosion
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 by Metal
Preservatives in the Humidity Cabinet (ASTM D1748-10). This test
evaluates the rust-preventive 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 rust.Based upon in-house testing of AMSOIL Z-ROD
10W-40 and a leading competitor obtained on 7/25/2019 in ASTM
D1748-10.*All trademarked names are the property of their respective
owners and may be registered marks in some countries. No affiliation or
endorsement claim, express or implied, is made by their use. All
products advertised here are developed by AMSOIL for use in the
applications shown.