WyKiD said:
A simple google search in most cases will reveal most oem suppliers, you can then in most cases source these oem brands from other suppliers at reduced prices....exact same part excluding BMW packaging and markup.
Please provide an example of what parts you are referring to.
On a specific item such as valve lifters which fit the M62 V8 one can acquire them from Goldwagen at the same price as the agents. The manufacturer is INA.
Lemforder (they manufacture for BMW)will supply lower control arms for the E46M3 at a discount of 10% to agents pricing.
In both above instances BMW will exchange a failed part across the counter whereas in the aftermarket you need to return the part pay for the new one and they will only refund you once they have examined the part and verified whether failure was as a direct result of fitment or materials failing.
I am not saying that aftermarket parts are not worth looking at however one should be mindful of the varying degrees of quality on what ostensibly looks the same as the original.
On consumable items such as air filters oil filters fuel filters I would look at the aftermarket and comfortably fit Hengst Mann or GUD provided I am not fitting into an S series engine.
For the S series engines the 10% saving I may gain is not worth the chance of a hefty repair bill should something go wrong.