Yep. I rest my case (for not adding ZDDP to your oil, yourself). Charles
really has a very informative website, doesn't he?
Bud Osbourne
----- Original Message -----
From: "Billy Zoom" <billyzoom@billyzoom.com>
To: "Bud Osbourne" <abcoz@hky.com>; "Spridgets" <spridgets@autox.team.net>;
"Peter Caldwell" <peter@nosimport.com>
Sent: Wednesday, July 22, 2009 8:54 PM
Subject: Re: [Spridgets] oil for spridgets
> http://www.lnengineering.com/oil.html
>> Beware of ZDDP boosters and concentrates being sold under various names.
>> These
>> products should truly only be used at time of break-in or not at all if a
>> fully-formulated break-in oil is used. I haven't tested every one of
>> these
>> products, but one thing is very obvious to me. Every product previously
>> sold
>> to boost ZDDP, be it STP or EOS, always had roughly an equal amount of
>> detergents to offset the affect of ZDDP in reducing the TBN of motor oil.
>> Most
>> of these ZDDP concentrates omit detergents altogether or use over-based
>> Ca
>> detergents known to reduce the efficiency of the anti-wear properties of
>> the
>> oil! Just like you need more Zn and P in an oil that has more detergents,
>> you
>> also have to have additional detergency because of the breakdown of ZDDP
>> in
>> peroxides and its interaction with combustion byproducts to form sulfuric
>> acid. Knowing the right balance is something best left to the oil
>> manufacturers and their chemical engineers. More acid, will increase the
>> oils
>> TAN, and will lead to corrosive wear of bearings. For once, I will have
>> to say
>> that more is not better, especially in this case. EOS and STP are decades
>> old,
>> and proven products that work synergistically with your existing motor
>> oil and
>> were never designed to boost the Zn and P more than 100-200ppm - unlike
>> some
>> recommendations to run double the ZDDP, in excess of 2000 ppm, which can
>> lead
>> to increased wear! It is not only the level of Zn and P that is
>> important, but
>> also starting with an oil that meets the ACEA A3/B3 standard would assure
>> a
>> starting TBN of 10 or higher and with similarly higher HTHS viscosities
>> will
>> also give you greater protection too. If you do choose to use these
>> products,
>> you must do used oil analysis to determine drain intervals and monitor
>> overall
>> TBN retention and ensure that the TAN increase does not lead to increased
>> bearing wear! Too much ZDDP can also foul spark plugs and oxygen sensors,
>> not
>> to mention plug EGR valves and the catalytic converter. Additionally,
>> lack of
>> testing of these ZDDP boosters compared to fully formulated oils intended
>> for
>> racing or for older engines or even against SM-rated oils side by side do
>> not
>> instill confidence in their performance, or at least at the time this was
>> written.
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