[Mgs] OIL

[riverside]

Most, but not all piston engines of our size like 10 lbs of oil
pressure per 1000rpm.   I do not like to go over 15 'cause
we're just wasting power squeezing the crap out of the oil.
Using heavy oil to compensate for worn or improperly sized
bearings is a utilitarian band aid .

art de armond

----- Original Message ----- 
From: "Vance Navarrette" <v.navarrette at comcast.net>
To: "'Paul Hunt'" <paul.hunt1 at blueyonder.co.uk>; <mgs at autox.team.net>
Sent: Friday, August 27, 2010 2:05 PM
Subject: Re: [Mgs] OIL


> Paul:
>
> To get that large a viscosity range, the manufacturer adds more
> viscositizer. Viscositizer has inferior lubricating properties compared
> to the base stock, so the wider the viscosity range, the worse the
> lubricating properties.
> Consumer reports recommended a viscosity range no greater than
> 25, and stated that a range of 20 was to be preferred. This was many
> years ago, and I am sure that technology has improved since then. Never
> the less, I stick to 10W/30. This is within the range of recommended
> viscosities in the owners manual (as I recall, but I am bit fuzzy on
> that point).
> The lighter oils circulate more quickly on startup when most of
> the wear occurs. Once you have oil circulating the wear drops sharply,
> to the point where for the average motorist the lighter viscosities will
> result in improved engine life even though the ultimate film shear
> strength of the lower vis oils is inferior.
> Trust me, the thinking that you need higher oil pressure at high
> RPMs is just plain obsolete. Higher oil pressure reduces fuel economy
> because the oil pump works harder to pump the oil, and it gives no wear
> benefit. The lighter vis oils reduce wear AND improve economy - hence
> they are the recommended oils for modern engines.
> Us old timers with oil pressure gauges get twitchy when the oil
> pressure is not at 75PSI, so we tend to favor the higher weight oils, to
> the detriment of our motors.
>
> Vance
>
>
> -----Original Message-----
> From: mgs-bounces at autox.team.net [mailto:mgs-bounces at autox.team.net] On
> Behalf Of Paul Hunt
> Sent: Friday, August 27, 2010 12:51 AM
> To: Bert Palte; mgs at autox.team.net
> Subject: Re: [Mgs] OIL
>
>
> Castrol GTX for example stopped 20W/50 in the UK many years ago - they
> made
> it 15W/50 instead which was an improvement.  Then a few years ago they
> changed that to 15W/40, which showed up as lower oil pressure on my V8
> but
> not the roadster.  You can still get 20W/50 here, but only from the
> lesser
> names and specialist places.
>
> PaulH.
>
> ----- Original Message ----- 
>> Yeah, 20W50 is what I've been using over the last decades for my LBCs.
>>
>> An now,  I find that, over here, it i gettin more and more difficult
> to
>> get that grade....
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