[Bmcu] TR3 Oil

[Richard Fritz]

Jeff:

I'm afraid you have the interpretation of multiple viscosity oils turned
around.  The smaller number refers to the ability to flow at cold
temperatures and the higher number represents viscosity when fully warmed
up.  You need the 10 weight to get good oil circulation when starting the
car, and yes, that is more critical in winter than in summer.

Richard Fritz

----- Original Message ----- 
From: "Jeff Greenland" <jeff at utahlotusclub.com>
To: "William Beecher" <wbeech at flash.net>
Cc: <triumphs at autox.team.net>; "'BMCU'" <bmcu at autox.team.net>
Sent: Friday, May 11, 2007 4:21 PM
Subject: Re: [Bmcu] TR3 Oil


> I'm certainly not an expert on oils, but from what I do know, I'd stick
> with the straight weights.  The smaller number is how "thin" the oil
> gets when it's at operating temperature.  So, in your case, it sounds
> like your engine might have been designed to work off the heavier oils
> that stay heavy when they're hot.  When it gets thin, it's easier for it
> to squeeze past your rings and valves.  That, of course, means you're
> burning more oil, creating more carbon deposits, and then picking up
> contaminants from your combustion chamber and dripping them back into
> your oil pan (to be circulated all over again).  In addition, as your
> engine gets older and more worn out, the clearances in your engine parts
> start to increase, making it easier for the oil to start squeezing past.
>
> Again, I'm not an expert, so take that with a grain of salt.  That's
> just the way I understand it.
>
> Best of luck though!
>
> Jeff
>
>
>
> William Beecher wrote:
> > OK, I will admit to being a little out of the loop...it's been a while.
> >
> > Just getting the '58 TR3A on the road, it has been sitting for 5 years
with
> > fresh oil and I want to change it now that I have started and driven it
> > about 20-30 miles.  The original manual calls for SAE-30 @ 40-70 degrees
and
> > SAE-40 @ 70+.  Fifty years ago there were not all these multi-grade oils
> > available and I was wondering if a 10w-40w or some other  combination is
a
> > better choice these days.
> >
> > I would appreciate to know what you all use for general use on the road
and
> > around town, not competition.
> >
> > Thanks,
> >
> > BillB
> > TR3 (TS-303766)
> > "A bad day in your TR is better than a good day playing golf!"
> >
> >
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