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Hagerty
Hagerty Employee

Reformulated Motor Oils and Your Flat-Tappet Engine | Hagerty Media

In an effort to reduce harmful emissions caused by the burning of engine oil, manufacturers have reduced or removed some oil additives that are essential to keeping older engines running. Flat-tappet engines common in older British cars as well as Volvos and some American engines are wearing cams and lifters at a remarkably high rate.
https://www.hagerty.com/media/maintenance-and-tech/reformulated-motor-oils-and-your-flat-tappet-engi...
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