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<DIV>In a message dated 10/16/2017 1:15:25 A.M. Eastern Daylight Time,
catnine09@dslextreme.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>Now
since I chose all by my self to get caught up in this thought process , can't
say I need the zinc content required for flat tappet lifters , not sure ,seems
to run the same as it has pep wise and I hear no bearing noise.
</FONT></BLOCKQUOTE>
<DIV><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>Actually you do need to worry about it, because the oil companies
took it out of the oil starting around 2000. Without the ZDDP (zinc) you're
wearing the lobes off the cam. It won't wear or cause wear to the engine
bearings, but it will cause wear metal to metal contact surfaces.</FONT></DIV>
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<DIV><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>At this point since you broke the engine in with 20W50, I'd keep
using it, although I'd look for an oil WITH ZDDP in it. Your other option is to
add the ZDDP to the oil. You can add Lucas, or go with something else like GM's
EOS (Engine Oil Supplement). I use EOS, and it's not cheap at 30 bucks for a
small pint container (I add a 1/2 pint with every oil change), but it beats
taking out the engine, and tearing it down to replace the camshaft. I think of
it as cheap insurance. I've put about 12K on it in 10 years of summer only
driving, and that includes some hard miles in the middle of summer going to and
from a Type 3 Invasion.</FONT></DIV>
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<DIV><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>The reason for the removal of zinc (ZDDP) was it clogged catalytic
converters, and manufacturers switched to roller cams and away from "flat
tappet" cams. This is what the GM dealer told me, and can be found researching
oils, so it's not just something I'm pulling out of my butt. :-)</DIV>
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<DIV><FONT lang=0 size=2 face=Arial FAMILY="SANSSERIF" PTSIZE="10">Bob 65 Notch
w/Factory Sunroof converted to
IRS</FONT></DIV></DIV></FONT></FONT></BODY></HTML>