Just went to fill up, i was in a world of my own at the petrol station. So i filled 20L of Uleaded petrol before realizing what i have done. Is this going to do damage to my engine/turbo etc?

No, you probably wont even notice the difference

I guess you could just fill it as much as possible with 98 and take it easy till you fill up again (with 98 :-p)

its nearly stalling on idle and seems pretty sluggish now. i can live with that as long as it no damage is done. ill just drive like a granny till its all used up.

Not really. If it was diesel or carlton draught, then yes.

Mabye pop in some Wynns Octane booster if you can be assed or
do what the locals did to 4 cars in my complex last night and suck
that stuff out with a hose, dirty cnuts!

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO

haha, well if anyone wants 20l of free unleaded they are more than welcome to come around and grab it.

Octane booster is bad for the spark plugs! Id syphon it and just throw in 98. Would a fuel filter change afterwards be too anal?

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Honda Hannspree Edition CBR 600 RR - SOLD
Yamaha FZ1N - Purchased

im hoping yes lol

id just either use it up or fill up completely with 98 and it will all mix and use it up.