Zddp Maxx Zddp oil additive Zinc + Phosphorus Shipping Free

35 years in the automotive aftermarket, and I'm no fool.I have an 05' Tahoe 5.3L with Chevy lifter tick that is the worst I have ever heard.I pulled the valve covers, cleaned the pushrods, and lifters.Replace a few rockers thinking that was the problem.I tried flushing multiple times because I refuse to pull these heads with close to 200,000 miles.Sometimes it CLACK's Hot sometime Cold, but always CLACKS..I Tried, Seafoam, Rislone, Marvel mystery oil...After reading a service bulletin from GM, I purchased GM Enos, with 12,000ppm zinc andit helped after a few days.. but the fact that it helped little gave me hope.I tried the Crane Cams assembly lube because it supposedly has more zinc that the othersbut that didn't help at all.. Eventually, I timed it right, and got my ZDDP when I was ready to change the oil.At first, it sounded the same.. CLACK CLACK CLACK.. after a few days, (about 450 miles) itwas only CLACKING after about 30 minutes of driving...About 10 days in.. SILENCE! I swear SILENCE.150+ miles a day 4 to 4.5 hours in LA traffic daily.I drove it from LA to Seattle this summer.. SILENCE.I will even drive it to SEMA again this year..The engineer I work with asked me when I fixed the truck, I laughed and told him the truth.I am due for another oil change, and my new bottle showed up yesterday!I would ABSOLUTELY recommend this product.. its a winner

Everything was better in the good ol' days-- rock and roll, non-ethanol gasoline, action movies, and even motor oil had more good stuff in it to keep things moving. If you are driving a car with a flat-tappet engine (and if your car is older than about 1985, you most likely do), then adding zinc to your engine oil is important for reducing unnecessary wear to the valve train. I recenlty bought an '85 Nissan 720 pickup, and from the looks of it the previous owner wasn't too concerned about making the vehicle last. My first clue was the piece of bailing wire holding the choke open, but that's another story... Anyway, I changed the oil using a high-mileage conventional oil, and added ZDDP Maxx. The valves were quite a bit quieter afterwards, being properly lubricated for the first time since the Clinton administration.If you have an older engine, and you want it to last, read up about it online-- most likely, you need this product to be sure it is being lubricated as it was designed to be.

I have an older (over 25 years young) corvette. I've changed my own oil since I was old enough to turn a wrench. I've always used the best oils available at the time, currently fully synthetic. I never used any "oil additives" for various reasons, the biggest being they're mostly hype. But after researching and reading a lot of material over the years in the changes of motor oils' formula, I realize I am no longer protecting my engine as well as I thought. Thanks to the EPA and catalytic converters, zinc compounds are no longer present in sufficient quantities to protect pressure points in older designed valvetrains. ZDDP is exactly what the doctor ordered !

This is recommended additive for the vintage cars with flat tappet camshafts, as the newer oils have the zinc removed, which can cause excessive wear to the camshaft lobes.

a must for us older vehicle fanatics - modern oils had to remove the zincs & phosphates so not to clog up the catalytic with the soft metals. The same softies let our cams, followers & tappets live to a ripe old age. ZDDP is a must unless you want to join the thongs of flattened cam lobes littering the landscape :-(

I added this to my 1938 streetrod. SB pre 1975 Chevy V* and I was told that the valves needed a zinc additive. Price was good and I guess it is working, wont know until I tear it down which won't be far a couple of years. Unless something goes wrong..

I use this product in my 1972 Ford with a 429 engine. The new oils have removed these additives to accommodate modern smog control systems. The older engines need these additives to protect the valve train and other parts. The older engines were designed to use oils with these additives. The protection is cheap and I'm happy to find a decent source.

This stuff is vital for us flat-tappet guys, We build and race air-cooled VW engines in 14-hour endurance races, and we've had no cam failures using this and other brand ZDDP additives over the years.