This is a multi-part message in MIME format.
--===============8031439196273712352==
boundary="----=_NextPart_000_0072_01D525B3.0241AD50"
This is a multi-part message in MIME format.
------=_NextPart_000_0072_01D525B3.0241AD50
charset="utf-8"
Content-Transfer-Encoding: quoted-printable
>From my reading of spec sheets of oil available to me in the UK modern =
oils (including for Diesel) have had their ZDDP reduced over time as =
much for environmental reasons as for damage to catalysts, but then so =
have some 'classic' 20W/50 formulations. ZDDP content is what the =
manufacturer chooses to put in, so you can't say that any weight or API =
rating is automatically going to have a particular content. For example =
a few years ago Castrol XL 20W/50 SE was showing 800ppm, whereas GTX =
15W/40 SL showed 1035, and GTX Diesel 15W/40 1200. For classics they =
recommended their Syntec 20W/50 at 1200, whereas claims elsewhere said =
that their GTX 20W/50 would always be 1300-140ppm. Mobil 1 Fuel Economy =
0W/30 quoted 1000 whereas their Super 3000 Formula R 5W/30 showed 500. =
I've also seen a letter purporting to be a letter from Royal Purple =
stating that RP XPR 10W40 has over 1500-1600 ppm of ZDDP and "we could =
take all of the ZDDP out of our engine oils and still have 4 times the =
wear resistance of even the VR-1 oil due to our Synerlec additive =
technology".
At the moment over here the highest concentration seems to be Classic =
Oils Heritage 20W/50 at 1300ppm =
https://www.classic-oils.net/Classic-Oils-Heritage-20W50
A friend has personal experience of a new cam and tappets being wrecked =
in just 20k on a semi-synthetic 15W/40 SL, but from other things I have =
read really old classifications such as SB never had that much to begin =
with, and engines didn't suffer damage. So I suspect the problem with =
rebuilt engines is as much to do with poorer quality components these =
days as anything else.
But as I say that's the situation over here, and as someone else said =
this discussion could go on for ever.
PaulH.
------=_NextPart_000_0072_01D525B3.0241AD50
charset="utf-8"
Content-Transfer-Encoding: quoted-printable
=EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23588">
<STYLE></STYLE>
</HEAD>
<BODY=20
style=3D"WORD-WRAP: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space"=20
bgColor=3D#ffffff>
<DIV><FONT size=3D2>From my reading of spec sheets of oil available to =
me in the=20
UK modern oils (including for Diesel) have had their ZDDP reduced =
over time=20
as much for environmental reasons as for damage to catalysts, but then =
so have=20
some 'classic' 20W/50 formulations. ZDDP content is what the =
manufacturer=20
chooses to put in, so you can't say that any weight or API rating is=20
automatically going to have a particular content. For example a =
few years=20
ago Castrol XL 20W/50 SE was showing 800ppm, whereas GTX 15W/40=20
SL showed 1035, and GTX Diesel 15W/40 1200. For classics they =
recommended their Syntec 20W/50 at 1200, whereas claims elsewhere said =
that=20
their GTX 20W/50 would always be 1300-140ppm. Mobil 1 Fuel Economy =
0W/30=20
quoted 1000 whereas their Super 3000 Formula R 5W/30 showed 500. =
I've also=20
seen a letter purporting to be a letter from Royal Purple stating that =
RP XPR=20
10W40 has over 1500-1600 ppm of ZDDP and "we could take all of the ZDDP =
out of=20
our engine oils and still have 4 times the wear resistance of even the =
VR-1 oil=20
due to our Synerlec additive technology".</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>At the moment over here the highest concentration =
seems to be=20
Classic Oils Heritage 20W/50 at 1300ppm <A=20
href=3D"https://www.classic-oils.net/Classic-Oils-Heritage-20W50";>https:/=
/www.classic-oils.net/Classic-Oils-Heritage-20W50</A></FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>A friend has personal experience of a new cam and =
tappets=20
being wrecked in just 20k on a semi-synthetic 15W/40 SL, but from other =
things I=20
have read really old classifications such as SB never had that much to =
begin=20
with, and engines didn't suffer damage. So I suspect the problem =
with=20
rebuilt engines is as much to do with poorer quality components =
these days=20
as anything else.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>But as I say that's the situation over here, and as =
someone=20
else said this discussion could go on for ever.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV></BODY></HTML>
------=_NextPart_000_0072_01D525B3.0241AD50--
--===============8031439196273712352==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Mgs@autox.team.net
Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
Unsubscribe: http://autox.team.net/mailman/options/mgs/mharc@autox.team.net
--===============8031439196273712352==--
|