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Thanks Bill for a great post!
I'm going to report your SM opinion to my dormitory RA because I feel a
microaggression ... since I self-identify as SD.
On Friday, June 19, 2015, WILLIAM B LAWRENCE <ynotink@msn.com> wrote:
>
>
> ------------------------------
> From: ynotink@msn.com <javascript:_e(%7B%7D,'cvml','ynotink@msn.com');>
> To: michael.oritt@gmail.com
> <javascript:_e(%7B%7D,'cvml','michael.oritt@gmail.com');>
> Subject: RE: [Healeys] Oil again
> Date: Thu, 18 Jun 2015 03:08:45 +0000
>
> I see I'm late to the party on this topic. I was up in the Rocky Mountains
> participating in the Glenwood Springs Rallye when it started and frankly I
> wish I still were. However, at the risk of being called ignorant,
> uninformed, commie pinko or whatever I have a little information that may
> be of help in sorting out the oil confusion.
>
> Engine oil comes in generations as defined by the additive packages which
> are blended in to tailor them for specific purposes. These generations can
> be traced by the API codes which are located on the container.
>
> The API code is two letters found on the label. The first letter is
> either a C, which denotes the oil is intended for use in a compression
> ignition engine, or an S which denotes it is intended for use in a spark
> ignition engine.
>
> The second letter denotes the type of use intended and follows the
> development of the internal combustion engine from the most primitive (A)
> to the most sophisticated (I think they are at O Now). protective amounts
> of zinc were dropped from the additive package at SM. Any oil before that,
> or say from SD through SL, still contains zinc.
>
> It may be true that zinc is not necessary for engines after the camshaft
> break-in, but I prefer to be cautious on that score so I look for oil that
> is SL or earlier. I'll let the more informed and adventurous members
> conduct that experiment...
>
> Some heavy duty oils such as Chevron Delo or Rotella are rated for both
> compression ignition and for spark ignition service and will show both a C
> and an S rating. In some cases those oils will still have an SM or later
> rating.
>
> The one oil type I have found that is reliably rated below SM is four
> stroke motorcycle oil because motorcycles don't have catalysts. Typically
> it is rated SF or SG. Since the oil has no way of knowing it is being run
> in an automotive engine and my Healey doesn't know the oil it's spewing is
> meant for a motorcycle I have been running Castrol 4T in 20W-50 grade quite
> happily.
>
> As for the controversy part, if we start banning contentious topics we
> soon won't have anything to talk about like most modern college campuses.
>
> Bill Lawrence
> BN1 #554
>
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Thanks Bill for a great post! =C2=A0<div><br></div><div>I'm going to re=
port your SM opinion=C2=A0to my dormitory RA because I feel a microaggressi=
on ...=C2=A0since=C2=A0I self-identify as=C2=A0SD.<br><br>On Friday, June 1=
9, 2015, WILLIAM B LAWRENCE <<a href=3D"mailto:ynotink@msn.com";>ynotink@=
msn.com</a>> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin=
:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir=3D"ltr"><br><br><div><hr>From: <a href=3D"javascript:_e(%7B%7=
D,'cvml','ynotink@msn.com');" target=3D"_blank">ynotink@msn=
.com</a><br>To: <a href=3D"javascript:_e(%7B%7D,'cvml','michael=
.oritt@gmail.com');" target=3D"_blank">michael.oritt@gmail.com</a><br>S=
ubject: RE: [Healeys] Oil again<br>Date: Thu, 18 Jun 2015 03:08:45 +0000<br=
><br>
<div dir=3D"ltr">I see I'm late to the party on this topic. I was up in=
the Rocky Mountains participating in the Glenwood Springs Rallye when it s=
tarted and frankly I wish I still were. However, at the risk of being calle=
d ignorant, uninformed, commie pinko or whatever I have a little informatio=
n that may be of help in sorting out the oil confusion.=C2=A0<div><br></div=
><div>Engine oil comes in generations as defined by the additive packages w=
hich are blended in to tailor them for specific purposes. These generations=
can be traced by the API codes which are located on the container.=C2=A0</=
div><div><br></div><div>The API code is two letters found on the label.=C2=
=A0<span style=3D"font-size:12pt">The first letter is either a C, which den=
otes the oil is intended for use in a compression ignition engine, or an S =
which denotes it is intended for use in a spark ignition engine.</span></di=
v><div><br></div><div>The second letter denotes the type of use intended an=
d follows the development of the internal combustion engine from the most p=
rimitive (A) to the most sophisticated (I think they are at O Now). protect=
ive amounts of zinc were dropped from the additive package at SM. Any oil b=
efore that, or say from SD through SL, still contains zinc.</div><div><br><=
/div><div>It may be true that zinc is not necessary for engines after the c=
amshaft break-in, but I prefer to be cautious on that score so I look for o=
il that is SL or earlier. I'll let the more informed and adventurous me=
mbers conduct that experiment...</div><div><br></div><div>Some heavy duty o=
ils such as Chevron Delo or Rotella are rated for both compression ignition=
and for spark ignition service and will show both a C and an S rating. In =
some cases those oils will still have an SM or later rating.</div><div><br>=
</div><div>The one oil type I have found that is reliably rated below SM is=
four stroke motorcycle oil because motorcycles don't have catalysts. T=
ypically it is rated SF or SG.=C2=A0<span style=3D"font-size:12pt">Since th=
e oil has no way of knowing it is being run in an automotive engine and my =
Healey doesn't know the oil it's spewing is meant for a motorcycle =
I have been running Castrol 4T in 20W-50 grade quite happily.</span></div><=
div><br></div><div>As for the controversy part, if we start banning content=
ious topics we soon won't have anything to talk about like most modern =
college campuses.</div><div><br></div><div>Bill Lawrence</div><div>BN1 #554=
<br></div> </div></div>
</div></div>
</blockquote></div>
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