[Healeys] Oil again

[Alan Seigrist]

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 at msn.com> wrote:

>
>
> ------------------------------
> From: ynotink at msn.com <javascript:_e(%7B%7D,'cvml','ynotink at msn.com');>
> To: michael.oritt at gmail.com
> <javascript:_e(%7B%7D,'cvml','michael.oritt at 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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