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Actually the oil filled aftermarket coils don't hold up laying sideways...You need the epoxy filled versions when mounting horizontal...

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Some coils are not designed to be mounted horizontally and will therefore leak if not mounted upright. If you still have the packaging take a look at the fine print and I would guess it says something about that. What I got was a black MSD Blaster 2 and peeled the label off it before mounting it in the stock position. Can't recall now if it's oil-filled but MSD said it could be mounted either way. Other than the missing date code and Mopar symbol it looks stock... and it's not leaking.