This differentiation between the two comes down to the way both cams are designed. While the engine is on, the cam lobe constantly slides on top of the tappet, generating a great deal of friction and raising the temperature. Without proper lubrication, this friction can end up causing a considerable amount of damage to the vehicle. This damage to the valve operation can have several negative effects on the engine. You always need zinc oil additives for flat tappet cams if you want your engine to last as long as possible.
For example, the Hy-per Lube Zinc Replacement Additives provides an excellent alternative to high zinc motor oils. Instead of worrying about zinc damaging your engine over time, you can use a zinc replacement additive that offers greater protection without the negative effects of zinc build-up. Contact us if you have any questions about the products, as our knowledgeable and friendly staff will be happy to help.
Posted in: Engine. English — Download PDF. Box Holly, MI Canadian Visitors Enter Here. Why Camshafts Need Zinc Motor Oil The camshaft is often the main reason your engine needs either zinc or a zinc replacement additive in the motor oil you feed to it. How Do Zinc Additives Work? Why Use Zinc Replacement Additives? Benefits of Zinc Replacement Additives Using a zinc replacement additive for old cars comes with several advantages that make it a superior motor oil to anything else on the market for older vehicles.
Environmental responsibility : The emissions from older engines that use zinc-based motor oils can be harmful to the environment. A zinc replacement additive improves on zinc motor oils by removing any heavy metal from the formula and reducing harmful emissions.
Cold-start protection: For vehicles that have gone through a long period of disuse, their engines can often be at risk of damage due to a cold start.
With zinc replacement additives in your oil, the cold-start wear on your engine will be reduced significantly. All of our Hy-per Lube products are formulated with the newest cutting edge technology available. As Seen On. Our Retail Partners The Hy-per Lube brand is proudly represented by the best automotive retailers in the business. Hy-per Lube P. Connect With Us. Generic selectors. Exact matches only.
Search in title. Search in content. Advertisement For years, these additives provided sufficient anti-wear service in the early days of gasoline non-detergent motor oils. Diesel engines of the time, which generally operated at lower speeds and were more massively built, did not exhibit the same wear problems.
But in a gasoline engine, the valve train is more heavily stressed due to the higher engine speeds. This produces high sliding speed and friction between camshaft and lifters, which tend to be poorly lubricated since they are dependent on oil splash for lubrication.
High impact loads also resulted from the reaction between cam lifter, pushrod, and the rocker. Advertisement Impacts in this system start at the camshaft and ending at the valve stem were increased in severity as valve spring pressures and thus loading increased. These loads cause scuffing from metal-to-metal contact. Small additions of additives such as ZDDP were sufficient to provide anti-wear protection for these mechanical parts. Diesel engine oils contained detergent additives to combat the pollutants caused by diesel fuels and their combustion.
There were many failures with heavy wear resulting particularly in the cam and tappets when attempts were first made to use diesel oils containing detergents or to introduce detergent additives into the oils of gasoline engines.
Advertisement Theories abounded. It was erroneously thought that these detergents were either chemically attacking the metal or that these metallic compounds were actually abrading the metal surfaces. The problem is simply real estate — there is only so much metal surfaces for the boundary layer and anti-wear additives in the oil to attach.
And because most detergents do not have significant anti-wear capability, the surfaces become unprotected, and wear takes place where loads are the heaviest.
To overcome this, a concentration of anti-wear additive, such as ZDDP, must be increased substantially to compete successfully with the detergent and get some measure of protection to these metal surfaces.
Advertisement The American Petroleum Institute API standards for auto and diesel oils are represented by the alphabetical codes we see on the containers. Some are simply no longer useful: SA contains no additives and was designed for engines built before ; SB was for engines previous to ; SC for engines previous to and so on up to SH, now obsolete, which was for engines built in or older. Today we can still find SJ-for and older automotive engines, SL-for and older automotive engines and the most current SM.
Introduced in , SM oils are designed to provide improved oxidation resistance, improved deposit protection, better wear protection, and better low-temperature performance over the life of the oil. It was not until , when the rating went to SL, that we all started to see camshaft problems appear.
In , SL-rated oil still contained 1, ppm of phosphorous, and it is the phosphorous that limits are set on. But this limits the amount of ZDDP an oil manufacturer can use. The rating was changed due to demands for increased engine cleanliness standards. Advertisement Higher levels of detergents were introduced to meet these standards and camshaft problems began. It was not until , when SM rated oils, with their limited ppm phosphorus were introduced, that cam failures greatly increased.
I must point out that these phosphorus level mandates are on SAE 10W and lower viscosity grades only. Advertisement Most higher viscosity grades have adopted lower phosphorus content levels, but it was not mandated.
They still must meet the higher detergent and dispersant levels to meet the API cleanliness requirements of an SM rating. Click here to update settings. Has zinc been removed from motor oils? Not finding the answer you want? Ask your own question. Ask our experts Have a car maintenance question? Our technical experts are here to help Search our archives. I agree to the terms and conditions Click here for terms and conditions. Related topics. All about oil FAQs.
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