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n I operate a number of BMC Mini-vans and have
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been informed that the makers recommend running on a petrol with an octane rating of at least 94. Is there any objection to running on a commercial grade of petrol with an octane rating of 90?
AIn practice the octane requirement of different engines of the same type is seldom consistent and conditions of service may also play a part in determining whether the use of a fuel with a lower octane number than that recommended is permissible. If an engine pinks, a fuel of higher octane rating should be used. Or if the engine is heavily carbonee, decarbonizing may enable it to be run without pinking on the fuel with the lower octane rating.
If none of your Minis pinks under the most arduous conditions of service with a standard ignition setting, running on a petrol of 90 octane should not in any way be harmful to the engines, but it may be necessary to consider each van individually and vary the fuel accordingly. A number of users report successful operation of Mini-vans on 90 octane fuel over long periods, but some Minis do pink when running on this fuel and damage could result from continued pinking.
Obviously the driver of a lightly laden van who uses his gears sensibly and avoids slowspeed slogging is less likely to cause damage to an engine that is liable to pink than the driver of a fully laden van who uses his gears inexpertly.