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That damage looks very much like the damage that was seen during the first
year or so that oil companies started cutting down on the ZDDP in their oil,
but had neglected to tell anyone. Since then, experienced engine builders have
been using engine assembly Moly lube and run-in oil that are very high in ZDDP
for that first start-up and first oil change after the initial start-up, so
that the new cam lobes get micromachined and microscopic gaps get filled in.
Otherwise, what happens is that the lobes and cam followers weld and break and
weld and break and weld and break until the surface is pulled away from the cam
in big chunks. The interesting thing, possibly, is that the synthetic oil
actually postponed this problem for some period of time -- we don't know how
many miles this TR has been driven over those two years -- and the problem may
not have fully materialized until the time it did.
I don't think the use of synthetic oil had anything to do with this outcome. I
ran synthetic in my MGA race car for the years I drove it because it performed
much better at continuous high rpm than standard oil, but for normal rpm in a
normal engine, regular 10-40 or 20-50 dino oil is just fine.
G.
Gary Anderson
Editor at Large, Austin-Healey Magazine
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<div> <font size="2">That damage looks very much like the damage that was seen
during the first year or so that oil companies started cutting down on the ZDDP
in their oil, but had neglected to tell anyone. Since then, experienced engine
builders have been using engine assembly Moly lube and run-in oil that are very
high in ZDDP for that first start-up and first oil change after the initial
start-up, so that the new cam lobes get micromachined and microscopic gaps get
filled in. Otherwise, what happens is that the lobes and cam followers weld and
break and weld and break and weld and break until the surface is pulled away
from the cam in big chunks. The interesting thing, possibly, is that the
synthetic oil actually postponed this problem for some period of time -- we
don't know how many miles this TR has been driven over those two years -- and
the problem may not have fully materialized until the time it did.<br>
<br>
I don't think the use of synthetic oil had anything to do with this outcome. I
ran synthetic in my MGA race car for the years I drove it because it performed
much better at continuous high rpm than standard oil, but for normal rpm in a
normal engine, regular 10-40 or 20-50 dino oil is just fine.<br>
<br>
G.<br>
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<div> <br>
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<div style="font-family:helvetica,arial;font-size:10pt;color:black"><font
face="Times New Roman, Times, serif"><i>Gary Anderson</i><br>
<br>
<font size="2">Editor at Large, Austin-Healey Magazine</font></font><!-- end of
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