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Banbury Monograde 50W
Available in 1Ltr and 5Ltr Sizes for delivery or collection.
A mineral based oil with API SE specification. SE specification has been superseded in modern engines but is suitable for model year 1979 and older engines.
Clearly the tolerances, power outputs and engine speed revolutions in many pre-79 engines as well as the emissions allowable at that time means this low specification oil manages these more basic engines (where the manufacturer recommends it) perfectly adequately.