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.
Package sizes include:
1-Quart Bottle
1-Quart Bottles (case of 12)
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.
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.
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.
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.
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.
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.
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).
Click here to view the MSDS Data Sheet for AMSOIL ZRF.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
| TYPICAL TECHNICAL PROPERTIES | |
| AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF) | |
| Viscosity @ 100°C, cSt (ASTM D445) | 19.2 |
| Viscosity @ 40°C, cSt (ASTM D445) | 136.2 |
| Viscosity Index (ASTM D2270) | 161 |
| Flash Point °C (°F) (COC) (ASTM D92) | 244 (457) |
| Fire Point °C (°F) (COC) (ASTM D92) | 262 (486) |
| Pour Point °C (°F) (ASTM D97) | -40 (-40) |
| NOACK Volatility, % weight loss (g/100g) (ASTM D5800) | 4.8 |
| High Temperature/High Shear Viscosity @ 150°C, 1.0 X 106 s.-1), cP (ASTM D5481) | 5.1 |
| Four-Ball Wear @ 40 kgf, 75°C, 1200 rpm, 1 hr, scar diameter, mm (ASTM D4172) | 0.36 |
| Total Base Number (ASTM D2896) | 9.0 |
Product Name: Racing Motor Oils
Current Rating: 4.76out of 5 stars
Votes & Reviews: 51 vote(s) and 113 user reviews.
Reviewed by Darrell: 
This is the best oil you can buy Does a car eng. good !!
Reviewed by Ron:
Dropped my water temp by 12 degrees !! Great product !
Reviewed by Robert:
I use this product in my street rod, a 1930 ford with a 466 inch ford motor. I believe the oil is dewing its job but when I been submitting the oil for testing I am getting results that do not make sense. Other wise I will continue using this oil..
Reviewed by Jj:
Great oil, run it in our Briggs animal kart motors on methonal... Keeps the motor at cooler running temps
Reviewed by Jim:
I wouldn't use anything else in our racing engine. This engine had 300,000 miles on it when we put it in our racecar. Now, in the racecar, it's lasted 2 full seasons and still going strong.
Reviewed by Fred:
We run this in our imca 604 crate engine works great
Reviewed by John:
Best there is!
Reviewed by Christopher:
Works great in my supercharged Vette!
Reviewed by Jeremy:
Great product and customer service
Canada
United States
T/A using synthetic oil
I use it in a 1979 Trans Am with the Pontiac 400 CI engine with 53K miles. Seems to hold great oil pressure from idle to high rpms. I have not noticed the leakage of oil associated with the change from conventional oil to synthetic oil.