i have switched to genuine oil filters ONLY because of the better gasket, with the oil seal design with the raised extra outer lip. i have NEVER had seepage or a seal blown with the factory filter. your seal blows because the oil pressure relief valve sticks, and normally, when oil pressure is too high, the relief valve will open, and dump the oil back into the sump. synthetics have superior flow rates to conventional oil, and, of course, thinner oils flow faster. the relief valve is opening lots of times during the engines normal run cycle.
be very careful when torqueing down the threaded shaft that holds the sandwich oil cooler. if you over torque it, you will crush it, and then you will get oil and coolant mixing, NOT a good thing. over time, the viton o ring seal on the back of the sandwich oil cooler gets hard, and shrinks. this, combined with the many filter changes, will cause the threaded shaft to back off, and you will get oil seepage, and, in extreme cases, oil will dump past the seal. the very inner part of the sandwich is higher than the outer part, so when you really torque it down, and bottom it out on the base of the oil filter head, you crush it. a new one is like more than 200 bucks, but, it does come with a new seal, which you cannot buy separately.
the best way to fix this is to go with the 90 t/e/l air to air oil cooler, this eliminates the sandwich, the threaded shaft for the filter is a part of the casting, so it cannot back off, the oil filter sits farther away from the downpipe, so heat transfer is much less, AND, the superior heat transfer of oil will GREATLY increase the life of the motor and turbo. it also eliminates another possible problem, that of the flexible coolant lines needed going to and from the sandwich cooler splitting, and you loosing coolant, which they WILL do.