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AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)

 Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
Product Code: ZRF • Brand: AMSOIL

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)

See Pricing or Place an Order
MSDSData Sheet

Product Details

Product 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.

Product Description

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.

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).

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.

Close Product Detail
Technical Data
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
Close Technical Data

 Z-ROD 20W-50 Synthetic Motor Oil (ZRF)

Did this product meet your expectations?

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Product Name: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
Current Rating: 4.76out of 5 stars
Votes & Reviews: 17 vote(s) and 16 user reviews.


A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jason: space

Nothing but the best for my 77 Corvette.

Best oil period for my original flat tappet L-82 Corvette.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Easy: space

Excellent zinc based oil

Bought this for a friend,he was looking for zinc based oil.
Engine has solid roller camshaft.
Mostly street duty,with some racing.
He's ready to buy more amsoil products for his other vehicles!!!

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ike: space

Will buy this oil again!

I have used this in my 1987 Silverado 5.0 with 250,000 miles on it for the last 20 years and, I still get 4500 miles to a quart and the engine is still quiet and has never been opened. Very happy with Amsoil!

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TINY: space

GREAT PRODUCT

ALL THE PRODUCTS PREFORM AS EXPECTED

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Fritz: space

I love zrod

I use this in my 90k mile evo to help combat the effects for e85

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Niles: space

20/50 z rod in my Dart

I drive my 68 Dart 2 dr sedan constantly !!!! Literally !!!! It is small block mild with 3 speed auto. And Z Rod Is All I run It Along With Synthetic oil filter and go air filter all AMS Oil Products!!! Recommend it to Everyone !!

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by RICHIE: space

Z-Rod Pro Street Oil.

Use this in my 1934 Ford Pro Street Pickup, With a 406 Small Block Chevy making in excess of 500 HP, Run it in very Hot Weather in the summer going to car Shows and Cruise nights, Preforms well with this oil, no problems at all, Love it.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Nikke: space

Cure for flat tappits!

The best for vintage engines!

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Timothy: space

Good for valve clatter.

Used this in 2 engines. Air cooled 911 and my S32 engined E24 M6. Both seem to enjoy the thicker oil and seems to quiet valve clatter. Very pleased.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

GREAT PRODUCTS!

I have a 1989 Toyota pickup that I have owned since new. I use only Amsoil products in my vehicles and am happy to say that the old pickup has 370,000 miles now and still runs like it did when new. Consider me a very, very happy customer!

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by g: space

Z-ROD oil

I switched to ZROD oil for my vintage gto mainly for the zinc/phosphorus content. when I did I changed from a competitors 10w40 to amsoil 20w50 because of oil usage (believed to be valve seal related) and oil consumption decreased significantly.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MuscleCarBuilder: space

I would not buy this product again

They say it's designed for older engines but it's not. Once your engine is at operating temperature the oil pressure drops below 10psi at idle because the oil is just too thin.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jim: space

Nothing much to review, I bought some oil

Used in a hot rod

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by donnie: space

classic car oil

purchased a few cases for my triumphs ..i've been running tr6's since the 80's in northern canada ..zrod with it's storage protection /zinc and 20/50 keeps my precision rebuilt engines in good health

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tom: space

Z-ROD 20w-50

This oil has lots of ZDDP. To protect my Cam and lifters. The 20W-50 I like because l run it in my air cooled engine. Even on a hot day with the Engine at temp of 280' I still have 30# of oil pressure. I also run Amsoil gear lube in the transaxle. I'm sold Amsoil products.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Subwaync: space

Longtime Amsoil User

I've driven VW Super Beetles for the last 35 years, and once the engines are broken in I've always switched over to Amsoil. And considering that I lived in the Southwest all of that time and 1st generation VW's are only cooled by Air and Oil; it made Amsoil a must. With it's ability to keep engine temps much lower and wear and tear down to a minimum it's been an easy decision.

Item Reviewed: AMSOIL Z-ROD 20W-50 Synthetic Motor Oil (ZRF)
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