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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> 5:10 PM
>
>
> Version: 7.5.467 / Virus Database: 269.6.8/797 - Release Date: 5/10/2007
> 5:10 PM
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