I have similar results (as your mate using Penrite 20W50) with Duckhams
Classic 20W50. Keeps up the pressure better than e.g. Castrol GTX 20W50
when really hot, but that is with prolonged motorway driving at 100mph+
with a Lotus 907 engine which is considerably more stressed than the
Austin 2660cc engine. Coolant is always at a steady ca. 90:C using a
89:C thermostat all year round. However if the oil pressure drops a bit,
as with some 20W50 oils, it does not neccesarily mean that the
lubrication is not sufficient for a road car.
If you use a car in real anger, e.g. on the track, you may need
different oils alltogether and better not use 20W50, but then again you
would ideally have to modify the engine anyway, fitting a HD oil pump
for a better flow and higher pressure, HD water pump, tighter tolerances
on the bearings, oil cooler, larger radiator etc.
Kees Oudesluijs
NL
> Love to hear how it goes. Personally, I use Penrite HPR40 on the road,
> and HPR50 on the track. Done my testing, made my decision.
>
> Here is a mates more eloquent test documentation.
>
> http://www.spriteparts.com.au/tech/oils.html
>
> Sincerely.
> Chris
>
>
>> I cannot see any reason why this oil will not be suitable. The SG/SH
>> specs are OK as is the viscosity. They claim better high temperature
>> resistance than car oils as the oil is intended for hotter running
>> air cooled and high revving motorcycles, so the oil pressure should
>> keep up a bit better when very hot on a long stretch of autobahn with
>> 100mph plus.
>> If it can take the conditions in a highly tuned motor cycle engine it
>> can easily take the conditions in an old low stressed unit like the
>> Austin engine which will take any 20W50 oil you throw at it.
>> Kees Oudesluijs
>> NL
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