Manufacturers build petrol engines to accept different octane levels of fuel (eg 91, 95 or 98). In all cases, the different fuels need to be free of contamination to allow engines to operate at their best and to reduce the risk of fuel-related problems.
So if you drive a diesel or petrol vehicle and use a service station that has a reasonably fast turnover of fuel and holding tanks in good condition, then the chances of picking up contaminated fuel is slight.
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Bad fuel causes expensive engine downtime and repairs! Use Fleet's diesel fuel tests to do on-the-spot testing of your diesel fuel.