Right,.....I know ur only suppose 2 put nothin less than optimax in but,...a geezer offerd me a 94 wrx 2day,...he's had it 4 only a couple of weeks since its import.I asked him wot fuel he's been puttin in it,and his reply was unleaded(prob about £30 worth)is this gonna cause a problem with the engine?

 

there has been a few threads on here, where import engines have gone bang, using normal unleaded

Unless remapped to use unleaded I would only use Optimax with Octane Booster, as Jap Imports are designed to run on 100 RON fuel