This isn't a reason not to use STP, per se, but I think GM's EOS is a better
product for raising ZDDP levels. It was designed and marketed as a break in
additive but a lot of car enthusiasts use it at every change in older, flat
tappet motors.
This is what I will be using when my stash of SL rated Valvoline is gone.
Here is a good article on oils:
http://www.lnengineering.com/oil.html
The author is primarily addressing Porsche motors but don't hold that against
him ;)
--------------------------------------------------------------------
Date: Sun, 2 Sep 2007 00:28:10 -0400
From: "Bob Donahue" <bobmgtd@insightbb.com>
Subject: Re: [Mgs] ZDDP again / STP
To: "mgs" <mgs@autox.team.net>
Message-ID: <002d01c7ed19$ab5a0fc0$6600a8c0@yourmb2swywknr>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Works for me. Does anyone have a reason not to use STP in an MG?
Bob Donahue (Still Stuck in the '50s)
Email - bobmgtd@insightbb.com
Cars: 52 MGTD - #17639
71 MGB - #GHN5UB254361
Member: NEMGTR #11470
NAMGBR # 7-3336
Hoosier MGB Club
Olde Octagons of Indiana
----- Original Message -----
From: "Larry Daniels" <ladaniels@sbcglobal.net>
To: "Bob Donahue" <bobmgtd@insightbb.com>; "MGs" <mgs@autox.team.net>;
"Spridgets" <Spridgets@autox.team.net>; <spitfires@autox.team.net>
Sent: Sunday, August 26, 2007 11:10 PM
Subject: Re: [Mgs] ZDDP again
>
> ----- Original Message -----
> From: "Bob Donahue" <bobmgtd@insightbb.com>
>
> This product sounds interesting.
>
> BTW, STP is supposed to have ZDDP in it. Does it have enough to make
up
> for
> what the EPA is taking out?
>
> Bob Donahue (Still Stuck in the '50s)
> ====================================
>
> Bob, I don't have any ppm numbers for you, but this is what STP told
me:
>
>
>
> I emailed STP from their website regarding the two oil additives and
their
> relative amount of ZDDP. Here is their response:
>
>
> Dear Mr. Daniels,
>
> Thank you for contacting us about STP Oil Treatment. We always
appreciate
> hearing from our consumers.
>
> The STP 4 Cylinder Oil Treatment contains only slightly more than the
STP
> Oil Treatment. They both contain about 4 times the amount of ZDDP as
what
> motor oils once contained. The product was originally designed for
flat
> tappet cam motors. We have many classic car owners that use our
product
> for
> this reason.
>
> Again, thank you for contacting us.
>
>
> Sincerely,
>
> Patti Copper
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