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Hi there. For what my two cents are worth to you. I drove a 1990 740 Turbo for three years. I drove it on BP's 98 octane. That 2.3litre engine took off when it needed to and the car started well with the high octane.
I now drive an S80 2.0 litre Turbo. I still use the BP 98 octane fuel. The car drives very well. It is not a patch on the 740 for power, take-off or otherwise. The S80 is a very sauve and refined car. But,
the new owner of my 740 noticed that my old car was starting to get difficult to start. It took him a while to find out that one of the people using the car was putting 91 octane fuel in it.
I notice that a lot of people try and do a cause, campaign and crusade on me when they try and tell me that they don't notice any difference between 91 and 98 octane fuel. In normal driving, you won't notice too much difference between the fuels. When starting or burying both feet into the accelerator to pass another vehicle-that is when you notice what you pay for.
Go with 98 octane. You won't regret it. You might regret putting cheap fuel into you car. If you are an environmentalist, 98 octane has less sulphur in it. That feature has to be good for you and your car.
Cheers
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