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AutoPartsCanadaOnline - Classic Cars

ZDDPlus Oil Additive

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ZDDPlus Oil Additive 

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ZDDP is an important engine oil addictive. It is widely known for protecting its 

sliding metal-to-metal cam lifter interface. It has been added to engine oil in 

certain amounts for over seven decades. In the past, auto manufacturers have 

demanded that it be removed from engine oil as it results in increasing emissions at 

the car tailpipe. The demand was as a result of the United States EPA program that 

called for increased catalytic converter life. As a result EP additive ZDDP known 

in full as zinc dialkyldithiphosphate; has been removed systematically over the 

years. This has happened toe to toe with the OBDII introduction and 

implementation. 


It has been proven that the addition of ZDDP helps to protect the engine by 

developing a film on cams and flat contact points to shield from extreme pressure 

and heat at the contact point. This film protects the base metal of the cam and lifter 

from wear. During normal service, ZDDP becomes phosphorus and zinc 

compounds, thus the ZDDP depletes. Studies have shown that a certain level of 

ZDDP is required or else depending on the extent of use of the engine, at around 

3000 miles of operation, give or take 1000; ZDDP levels can drop below adequate 

levels and cease to provide protection like it should. According to the SAE Tech 

Bulletin # 770087 [1] , operation of a flat tappet engine without adequate EP 

additives such as ZDDP quickly leads to lifter foot scuffing and cam lobe wear. 

Camshafts are typically only surface hardened leaving the core ductile for 

strength”. The experts say that once the cam lobe wear is up to 0.0002, the 

degradation that follows is fast and usually disastrous. Cars equipped with flat 

tappet cams need ZDDP for protection at their high-pressure points. The newly 

manufactured cars have roller rockers and as a result, ZDDP is not needed in those 

applications. Enter the new Plus protection - ZDDPlus oil addictive. 

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ZDDPlus oil additive has the correct level of ZDDP an engine requires. It gives at 

least 0.19% of zinc and 0.14% phosphorous when a 4oz. bottle is introduced to a 

regular 5 quart oil change. This is the same quantity in pre-OBDII oils. The use of 

ZDDPlus gives complete control over the level introduced into the engine oil 

which is best for maximum performance. ZDDPlus will help keep combustion 

particles from clumping. Experts have recorded it as the best classic engine 

protector. Simply add a 4 ounce bottle at every oil change and enjoy full protection 

throughout the life of your oil. Using high detergent oils reduces the friction 

reduction that the ZDDPlus affords; it’s better to stick to what works right!


ZDDPlus Canada Auto Parts Canada Online is the Leading Canadian Reseller for 

ZDDPlus Oil additives. and be in full control of your 

classic engine protection. ZDDPlus Canada knows what’s right for your engine. 

Call the leading auto part resellers for original, quality ZDDP today. 

ZDDPlus is that little thing that matters! Get it today!

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