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I'd stick with 10W-50 if you don't need the cold weather
capability. The bigger the 'viscosity gap'--e.g. 5W-50 is 45,
10W-50 is 40, etc.--the more VIs (viscosity improvers) are added to
a base oil. The VIs are long chain polymers that, when cold, are in
more-or-less in straight lines but 'curl up' when hot to increase
the viscosity of the oil. The bigger the 'gap' the lower the
viscosity of the base oil--10W-50 might have a base viscosity of 7,
for instance (just an example, I don't know the exact number)--and
5W-50 might be 3, etc. The VIs get 'sheared' in use and the hot
viscosity goes down as a result. At one time, at least, 10W-40 was
recommended against by some car manufacturers (BMW, I think), though
my father has used it for many years with no problems.<br>
<br>
I now use Valvoline VR-1 10W-50. Used Chevron 10W-50 for many years
when it was available at Costco.<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 6/10/2015 6:15 AM, John Rowe wrote:<br>
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<blockquote cite="mid:5578388D.3080105@westnet.com.au" type="cite">
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<font face="Arial">If you look at the description on the container
(at least here in Oz) the 5W-50 is for big bore flat tappet cam
engines. That is a very apt description of my 3000. The Castrol
Edge Sport</font> is the modern old Castrol R, It's all to do
with marketing.<br>
<br>
Cheers from West OZ<br>
<br>
John Rowe<br>
1959 3000 BT7<br>
and many others.<br>
<br>
<div class="moz-cite-prefix">On 10/06/2015 9:03 PM, <a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:warthodson@aol.com">warthodson@aol.com</a> wrote:<br>
</div>
<blockquote
cite="mid:14ddd919d3e-1e7-180a7@webprd-m41.mail.aol.com"
type="cite"><font color="black" face="arial" size="2">
<div><font style="background-color: transparent;" face="Arial,
Helvetica, sans-serif">At our local club meeting last nite
we had a discussion on motor oil. I had been using Castrol
Syntec 20W-50 but I learned that they no longer offer
that. They now offer Edge (formally Syntec) in
5W-50, 10W-40 & several other weights, but no 20W-50.
Several of our club members are using the 5W-50. Keeping
in mind that we seldom drive in weather below 40 degrees
F. What are your thoughts on using 5W-50? What weight oil
do you recommend?</font></div>
<div> </div>
<div><font style="background-color: transparent;" face="Arial,
Helvetica, sans-serif">All of the above oils contain
the zinc additive for classic cars. Also, Valvoline offers
their VR-1 in a 20W-50 with the zinc additive. </font></div>
<div> </div>
<div>Gary</div>
</font>
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