Friends,
A friend of mine recently contacted Castrol regarding changes to their GTX
oil formulation. His note, and their reply is below. In short, they claim
to still have some ZDDP additives in their SM category oil and that it is
"fully backwards compatible". Of course then they wash their hands of any
responsibility for cam/lifter failures. Not much additional information
really, but at least it comes straight from Castrol.
Joe Guinan
---------Original Message-------
I am the owner of a 1980 Triumph TR7. I heard that oil makers are going
away from zinc compound additives in their oil. I also heard that zinc is
essential for flat tappet motors. I see by your MSDS for Castrol GTX that
you still have some zinc additives in your oil. Is this going to change in
the future? Thanks!
--------Castrol's Reply--------
Thank you for contacting Castrol...
As indicated on our product packaging, the current engine oil category API
SM/ILSAC GF-4 is fully backwards compatible or 'back serviceable' and
extensively tested. Valve train issues are not anticipated with the use of
modern engine oil in older cars of OEM stock configuration. In fact, current
SM/GF-4 engine oils are subjected to testing that is far more intensive than
engine oils of previous API/ILSAC categories.
To clarify, in general, ZDDP levels have been reduced a small amount in the
current category engine oils (API SM/ILSAC GF-4) in compliance with industry
regulations that set maximum levels of Sulphur and Phosphorus, but are still
at levels that provide ample engine protection.
Special procedures have always been recommended for the proper initial
break-in of a new, matched, cam and lifter set; which include the use of a
properly formulated cam break-in lubricant paste which typically contains a
healthy dose of molybdenum. Engine oil alone is typically insufficient for
break-in of a new cam and lifter set, particularly in a vintage engine type
built to historic specifications.
In regards to camshaft failure, Camshaft failure can be attributed to
numerous possible causes. Only a thorough analysis of each case can identify
the root cause(s) of any failure.
We trust this information addresses your concerns.
Thank you again for your interest in Castrol, The Technology Leader!
Castrol Consumer Relations
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