ello mate,
ive got 99 1.8 20v non turbo, says the same on inside of cap, ran car real low on juice then banged a tenners worth of optimax in, within 10 mins of fuel gettin to engine the car was goin loads better than it ever has, on mk4 website every 1 is on about it all the time sayin how good it was, and i have to agree worth the extra pence per litre id say