I agree with the 20W-50 weight for TR's. I changed oil soon after
acquiring my TR6, used 10W-30, and wondered what had happened to my
motor! The oil pressure had dropped considerably. The british car
dealer/ restorer from whom I had purchased it told me to switch back to
20W-50, as that was the original weight of oil recommended for these
cars. I did, and have had excellent oil pressure since.
Robert Carley
73 TR6 CF5713U
On Fri, 22 Nov 1996, Barry Schwartz wrote:
> > using a multi-viscosity oil is superior to any straight weight. I would
> > use either a 5w-30 or 5w-40. If you do decide to take it for a spin on
> > one of those snow free days, the 5w will allow the engine to spin more
> > freely.
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> While I agree with using the newer improved, multi-grade oils, I disagree
> with the choice of weights. Remember when theese cars were built. The only
> oil available was of the single grade variety. The clearances built into
> these engines were such as to accommodate these oils. Newer engines are
> built and designed with much tighter/closer tolerances which take advantge
> of these new and better oils as well as thinner grades. If you use the
> thinner multi-grade oils, you will not have the proper oil pressure your
> engine was designed for. There is nothing wrong with a good grade of single
> weight, but if you want to use the "better" multi-weight I would recommend a
> minimum 20w-50. 5w is much too thin - and I think you'll find in your
> owners manual the viscosity for your car at whatever temp. Use a
> multi-grade that falls within these ranges.
>
> Barry Schwartz
> Bschwartz@encad.com (work)
> Bschwart@pacbell.net (home)
> (San Diego)
> 70' Spitfire (under-going major surgery) , 72'-V6 Spitfire (daily driver)
> 70'GT6+
>
>
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