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I have a 1996 Landrover Discovery (petrol). Can I use 91 octane (regular) fuel or is it recommended to use 95 octane only.
From the "Ask Jack" archives - 14 December 2009
These vehicles tend to suffer badly from high amounts of carbon build up in the intake side of the engine (valves and combustion chamber). In a worst case scenario this can lead to a loss or low compression on some cylinders.
The higher octane fuels tend to have better carbon cleaning additives which help this situation.
Fuels like BP Ultimate (98) and Shell V Power (95) advertise the fact their fuels help this situation and I tend to believe they do work over a long period of time.
So in summary I would recommend 95 octane or higher.