The o-ring goes in a special groove in the cap. It sounds like you didn't put it in the groove but assumed it goes all the way against the oil cap lip and if you put it there, it will deform and leak. Remove the oil cap and check the o-ring location.
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2010 535i M Sport - Platinum Gray/Dakota Black/Anthracite Bamboo
2016 Jaguar F-Type S AWD - Polar White/Cirrus
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