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Eastwood ZDDP Oil Additive 4 oz. is rated 4.9 out of 5 by 19.
Rated 4 out of 5 by from First time use I only recently purchased the product and added it to an oil and filter change in my 1970 Chevy El Camino with a 300 hp 350 ci engine. The vehicle is used regularly, but commonly only for short trips accumulating less than 1,000 miles per year so I was not too concerned about the lack of zinc in current motor oils. Also, there seems to be conflicting viewpoints as to whether modern oils really do not provide adequate protection for older engines. That said, with Eastwood's reputation for providing quality products and the reasonable price for this additive I decided to err on the conservative side and give it a try.
Date published: 2015-02-07
Rated 5 out of 5 by from Good for your engine When I found out when the motor oils today didn't have the required zinc as they did back in the day for older engines like the 283 V-8 in my 56 Chevy 210 2dr hdtp. I have notice a better running engine with the use of the ZDDP. I always have some on hand so when I do change oil, I can add it to the Mobil oil I use. I plan on using it in the 77 Corvette I just recently purchased. Very happy with the product.
Date published: 2012-07-18
Rated 5 out of 5 by from Just what i needed for my car. When looking through my 36-38 Buick club magazine i came across an article on motor oils. The article listed three(3) oil brands with ZDDP none of which is available in my area. Oils with ZDDP is recommended for low compression engines like in my 1938 Buick Century. (found Eastwood ZDDP on the inter net)
Date published: 2015-02-09
Rated 5 out of 5 by from A NEEDED MUST I bought this for my 1970 MUSTANG MACH 1 anyone with an older car with flat tappet lifters-cam, NEEDS the added zinc for added engine protection! The Eastwood ZDDP is very easy to add has great directions. Don't change oil in an older engine without it!
Date published: 2013-09-03
Rated 5 out of 5 by from Great find - Great value With the lack of zinc in current mineral based oils, I was hunting for something to compensate the absence for my 1987 Toyota FJ60 straight six. With only 140K miles on her, I wanted the tappets and valve train to be happy for miles to come. One bottle of this for each oil change is solid and inexpensive insurance to say the least. Fulfillment and shipping were quick as well.
Date published: 2015-03-24
Rated 5 out of 5 by from GREAT FOR OLDER ENGINES This is my second time purchasing the ZDDP additive. Bought it in the past for my 1970 Mach 1, 351W and now I have added a 1965 F-100, 352 to my toy list. I use the ZDDP in both and couldn't be more pleased with the product! A must for the older flat tapet engines!! I wouldn't change the oil without it
Date published: 2016-05-20
Rated 5 out of 5 by from Good Stuff Have been using this product for several years in my 56 Chevy and 77 Corvette. The oils today don't the necessary zinc additive for the older engines. I don't do an oil change with out it. My toys seem to like the stuff. Plus it doesn't add a lot to the crankcase with only 4oz. Great product.
Date published: 2013-12-02
Rated 5 out of 5 by from A must for any flat tappet engine! After reading many articles about zinc being remover from todays motor oil,i have used eastwood zddp with great peace of mind knowing it is protecting my motor.Eastwood has a reputation for great products and i have found this to be true in all products i have bought from them.
Date published: 2016-02-24
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How well does this product with diesel engines - i.e. 06 Cummins Turbo? Is there any benefit?

Asked by: WhiskeyTango
yes, this product can be used in diesel engines.. It is designed to help avoid or slow down premature deterioration..
Answered by: KHoffnagle
Date published: 2016-03-15

I have a 70 Vw Beetle that takes 2 3/4 qts @ oil change. How much ZDDP should I use? I read somewhere that to much could be harmful.  Thoughts.

Asked by: 70 Kafer
Use a 1/3 - 1/2 per oil change.
Answered by: SeanA
Date published: 2015-07-14

what is shelf life of ZDDP oil additive?

Asked by: wbrowne
It has the same shelf life as any conventional oil
Answered by: SeanA
Date published: 2017-01-27

My classic car is a street/strip car. The engine is orginal except for the 7 quart oil pan and the 1 quart oil filter I use. Is one bottle enough or should I go with 2?

Asked by: Kenny B
One bottle will be enough for a 4 to 6 quart oil change.
Answered by: MikeL
Date published: 2016-07-04
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Eastwood ZDDP Oil Additive 4 oz.

Item #12269Z

Prevents premature non-roller lifter deterioration


If you project vehicle is pre-1989, ZDDP Oil Additive is a must for keeping that engine running smoothly.

  • ZDDP alters bearing and journal surface characteristics to prevent metal-on-metal contact
  • ZDDP reduces the tendency of parts to scuff or gall under heavy loads
  • Add a 4-oz. bottle of ZDDP to every 4-6 quart oil change

If your engine was designed before 1989, the camshaft's non-roller lifters require ZDDP in the motor oil to prevent premature deterioration. However, the U.S. government recommended that ZDDP no longer be put into domestic motor oils starting in 1989, so today's motor oils won't provide the ZDDP additive your older engine needs...unless you add this ZDDP Oil Additive!

More info...

About Eastwood ZDDP Oil Additive 4 oz.

After 70+ years, the EPA mandated that all oil domestic producers remove ZDDP (Zinc Dialkyl Dithio Phosphate) from all conventional and synthetic motor oils. If your engine was designed before 1989 the non-roller lifters require ZDDP to avoid premature deterioriation. ZDDP also alters bearing and journal surface characteristics to prevent metal to metal contact. Under extereme conditions like a high perfromance motor, ZDDP reduces the tendancy of parts to scuff or gall under heavy loads. Simply add Eastwood ZDDP Oil Additive to every 4-6 quart oil change and your motor will be protected.


4 Fluid Ounces


12385 ZP Fast Motor Flush 12196Z Chassis Kleen


follow specific safety warnings on the MSDS always wear eye, skin and repsiratory protection when using chemicals


Made in USA


use at every oil change. Add entire contents of bottle to a 4 to 6 quart oil change. Compatible with synthetic and conventional motor oils. For use in non-pollution controleed gas and diesel engines. For use on 1989 and prior motors.

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