<html><body>Michaels-what a timely request. Just last week, I changed the oil in my MK1 Sprite. I normally use 30W conventional oil. When I went to the various auto stores in my town, all I could find was synthetic or synthetic blends. By luck one of the "Grocery" stores was selling some Castrol 20-50 regular oil in a 5qt jug for $19.95. (closeout?) I bought it, and changed the oil and the car road tested ran perfect and sounded great with clean oil and same oil pressure as previous. In fear, I went back and bought the last two remaining jugs of this elixir they had on the shelf.<div><br></div><div>Back when these cars were introduced, multi-grades were just starting to become available and Geoff Healey stated that although interesting, they would still recommend 30W. I plan to use it in the 100 and BJ8, also, as factory specified, in the Jensen-Healey. I have had occasion to see synthetics, due to there small molecular size, leak out of these cars whereas the conventional oil will stay in.</div><div><br></div><div>I think if Geoff was still with us today, he would agree that there is nothing wrong with multi-grades but probably not recommend synthetics unless you could keep a diaper under your Healey. Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "Michael Salter via Healeys" <healeys@autox.team.net><br>To: "Michael Oritt"<br>Cc: "Austin Healey"<br>Sent: Sunday March 20 2022 1:51:06PM<br>Subject: Re: [Healeys] Oil grade for 100 Le Mans<br><br>
<div>IMHO Michael that will be absolutely no
problem.
<div><br></div>
<div>M</div>
</div>
<br><div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun., Mar. 20, 2022, 4:45 p.m.
Michael Oritt via Healeys, <<a>healeys@autox.team.net</a>>
wrote:<br></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr">
<div class="gmail_default" style="color:#3333ff;">Through a stupid
mistake on my part today I purchased eight quarts of 20w50
synthetic Amsoil rather than the 10w40 I normally use
year-round. Unfortunately I discovered this mistake this
afternoon only after I completed the oil/filter change.</div>
<div class="gmail_default" style="color:#3333ff;"><br></div>
<div class="gmail_default" style="color:#3333ff;">I am concerned
that this higher-viscosity oil might in some way damage my
engine. It has been about 60-70K miles from the engine's
having been professionally rebuilt and while oil pressure has
fallen somewhat over the last several years the
gauge still indicates about 40 psi at 2500-3K rpm's and
about 20 psi at fast idle with 10w40, in both cases with hot
oil and at normal engine operating temperature. I took the
car for a very short spin after completing the change and I am
quite sure I did not did not get the oil up to full operating
temperatures but in any case the OP did seem a few psi higher than
what I am used to seeing</div>
<div class="gmail_default" style="color:#3333ff;"><br></div>
<div class="gmail_default" style="color:#3333ff;">At this point I
have about $125.00 invested in the mistake: seven quarts and
a new K&N filter. If my fear is verified by your opinions
I am certainly willing to drain and refill--I certainly do not want
to be driving around if there is a real risk of causing
damage. </div>
<div class="gmail_default" style="color:#3333ff;"><br></div>
<div class="gmail_default" style="color:#3333ff;">I eagerly await
the group wisdom.</div>
<div class="gmail_default" style="color:#3333ff;"><br></div>
<div class="gmail_default" style="color:#3333ff;">Best--Michael
Oritt</div>
<div class="gmail_default" style="color:#3333ff;"><br></div>
</div>
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