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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.
I now use Valvoline VR-1 10W-50. Used Chevron 10W-50 for many years
when it was available at Costco.
Bob
On 6/10/2015 6:15 AM, John Rowe wrote:
> 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 is the modern old
> Castrol R, It's all to do with marketing.
>
> Cheers from West OZ
>
> John Rowe
> 1959 3000 BT7
> and many others.
>
> On 10/06/2015 9:03 PM, warthodson@aol.com wrote:
>> 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?
>> 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.
>> Gary
>> Healeys@autox.team.net http://autox.team.net/mailman/listinfo/healeys
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/jarowe@westnet.com.au
>>
>>
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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>
</div>
<blockquote cite="mid:5578388D.3080105@westnet.com.au" type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<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>
<a moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
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href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
Unsubscribe/Manage: <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://autox.team.net/mailman/options/healeys/jarowe@westnet.com.au";>http://autox.team.net/mailman/options/healeys/jarowe@westnet.com.au</a>
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