It's a recognized fact that flat tappet engines require zinc (zddp) to keep the cam and lifters properly lubed, but there is at least one common engine out there, the 4.0 Jeep, that runs and lasts flawlessly using nothing but commonly available quicklube oil and no special additives or treatments.
So, is the zinc thing just a myth? Here's what you should know.
#jeep #cherokee #XJ #chrysler
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