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Engine Oil Additive ZDD Plus tm ( Zinc ) , Excellent For Preventing Cam & Lifter Wear On Non-Roller Cam Engines ? Ideal Substitute For GM's E.O.S. (Engine Oil Supplement) ? ZDDP (Zinc Dialkyl Dithiophosphate) ? Brings Current SM Oil Category Back To SF Specifications For EP (Extreme Pressure) ? Required For All Engines Prior To OBD Vehicles With Flat Tappet Cams ? 4 Oz. Bottle It's a well-known fact among engine rebuilders and mechanics, older engines especially performance engines prior to 1988, that have flat tappet setups required a well-known oil additive called ZDDP. The additive is made up of phosphorous, sulfur and zinc. By using the proper amount of these three chemicals, it makes ZDDP. This additive has been the most effective extreme pressure additive found in quality motor oil for almost 70 years. ZDDP is a surface modifier. It modifies bearing and journal surface characteristics to prevent metal-to-metal contact. Under the right conditions of heat and pressure, the zinc in the ZDDP actually plates over the contact surface and provides a sacrificial coating. As it breaks down, it dissipates back into the oil solution and remains in suspension until the right conditions arise and the process starts over again. This reduces the tendency of parts to scuff and gall under heavy-loaded boundary lubrication situations. Size: N/A
Corvette Central #: 301157
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
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Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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