The compound is ZDDP. Oil companies started adding ZDDP (zinc dialkyldithiophosphate) to engine oil back in the 1950s to help reduce wear and tear during engine start-up. Test show on flat tappet cams it reduces bearing and journal wear by a factor of 20. It's that important.
This does not matter on Newer vehicles because most use a roller valvetrain.
According to the EPA and automakers, ZDDP deposits can damage catalytic converters in new cars, reducing their effectiveness as pollution control devices. The zinc bonds to the metal catalyst beads inside the converter, which undermines their purpose. For motor vehicles with catalytic converters (1975-up), it can mean increasing pollution levels from contaminated catalytic converters.
This is especially important when you first break in a flat tappet cam. I have personally seen 6 cars have the cam get wiped withen 500 miles do to the lack ZDDP. "Diesel" oil has more ZDDP than conventional oil. I cannot remembet the numbers off the top of my head , but IIRC the old stuff had 1500ppm, shell Rotella has 11 to 1200 and conventional oils had 5 or 6 hundred. I run A ZDDP adder on ALL of my old gas vehicle as well as rotella 15 40.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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