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(More customer reviews)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 !
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