At 11:23 AM 11/22/96 -0500, you wrote:
>In a message dated 96-11-22 09:11:32 EST, stuartb@voicenet.com (Stuart
>Bollen) writes:
>
>> Why use an obsolete type oil?
>
>We run Valvoline 50 Racing (straight weight) in the 63 Capri. It has a 73
>Kent motor, never rebuilt. Has an estimated
> 250,000,000,000,000,000,000,000,000 miles on it and has never been rebuilt.
> It could use a good rebuild, especially a valve guide refurbishing. Still
>has good oil pressure and no rod noise.
>
>But I will tell you why we use straight weight 50 (no, not because it leaks
>out slower). The car simply does not smoke when we use it. Multi-weights ,
>even 20w-50, smoke. Straight weight does not. Its that simple. Don't know
>why it works. But it does, and the engine runs better now than when we
>bought the car three years ago.
>
>The tip came from an experienced auto racer/mechanic with Bimmer experience.
> He specified top quality racing 50 weight. This is the second car we have
>successfully treated with this method.
>
>Maybe there are some engineers or chemists who can shed some light on this.
>
>Brian
>
>79 Spitfire
>65 Spitfire
>63 Consul Capri
>
>Brian, I would think it would be extremely hard to crank a TR3 in the
middle of winter with a straight 50w oil. I would also be concerned about
shearing off the oil pump drive.
I would stay with 10-40 for the winter, 20-50 in the Summer, although my TR3
is holding oil presure with a 10-30 year round. I do find it necessary to
use the 10-40 or 20-50 in my TR6 in the summer or oil pressure at idle is
only 15lbs.
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