okyoureabeast,
You might be able to get a sticker like that from a diesel supplier or truck parts seller. My experience is though that it wont do much good as some of those who fill your tank can not read any way. I think that's why they made the petrol nozzle smaller so that the cretins could not put diesel in a gasser. We need some sort of device that detects the petrol nozzle being lifted from the pump and gives an audio warning to the attendant "DONT PUT THAT CRAP IN THIS CAR YOU IDIOT"

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving