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R 40
03/09/2001
DESCRIPTION
Castrol R40 is a castor-based lubricant containing specially prepared additives to prevent rapid
deterioration through oxidation. Its superior oiliness over mineral oils, imparted by the chemical
structure of its components, gives it a great affinity for hot surfaces and provides excellent
load-carrying properties which is an important consideration with highly stressed engines running at
peak revolutions.
APPLICATION
Although Castrol R40 is primarily designed for the racing world, its unique properties can also
benefit the private owner interested in really high performance.
When selecting an engine lubricant for sports cars, modified saloons or high performance motor
cycles, it must not be assumed that a special oil is always necessary. In the vast majority of cases
the well-known, widely available brands of Castrol motor oil are entirely satisfactory for racing, and
most modified and tuned production vehicles will operate perfectly well on these. Where special
cam shafts are fitted though, there may be a case for using Castrol R40 as the small areas in
contact will be heavily loaded especially where double valve springs are fitted.
For racing and high speed rallying, however, Castrol R40 does provide the ultimate in lubrication in
return for extra cost. If the best possible performance coupled with reliability is the aim, then the
remarkable stamina and great film strength of Castrol R40 will provide a valuable "margin of safety"
at ultra high engine speeds and temperatures.
TYPICAL CHARACTERISTICS
SAE Viscosity Rating
Density at 20ºC
Viscosity at 40ºC, mm²/s
Viscosity at 100ºC, mm²/s
Viscosity Index
Flash Point ºC
Pour Point ºC
40
0.955
142
14.9
101
234
-33
All reasonable care has been taken to ensure that the information contained in this publication is accurate as at the date of printing. It should be noted
however that the information above may be affected by changes occurring subsequent to the date of printing in the blend formulation or methods of
application of any of the products referred to or in the requirements of any specification approval relating to any such products.
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R 40
CAUTION
Never mix Castrol R with mineral based oils
It should always be remembered that Castrol R will not mix with
conventional mineral or synthetic crankcase oil.
When changing from one type to the other, Castrol Solvent
Flushing Oil must be used in accordance with the
recommended change-over procedure.
Health and Safety information sheets are available for all Castrol products from the address below.
Castrol International, Pipers Way, Swindon, Wiltshire SN3 1RE, England, Telephone: Orders/Enquiries
(08459) 123011, Technical Enquiries (01793)452222, Fax (01793)453750
All reasonable care has been taken to ensure that the information contained in this publication is accurate as at the date of printing. It should be noted
however that the information above may be affected by changes occurring subsequent to the date of printing in the blend formulation or methods of
application of any of the products referred to or in the requirements of any specification approval relating to any such products.
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