[Thecastle]

Will running a 90c thermostat help oil seals,last longer. YES! Will it double their life no..

Oil seals loose their ability to seal over time as their elastosizers evaporate and migrate out of the seal. Once this happens the seal looses its flexibility and hence it’s ability to conform to the shape of the sealing surface and leaks begin.

Lowering temps will reduce the speed of the loss. Adding oil additives like atp-205 help which restore the elastosizers can fix he problem too. The major issue is the seals bmw use aren’t well suited to the engine design,

Without changing something every n63 will need new valve stem seals at around 70k miles.

The x5m s63 uses a low temp thermostat and very rarely has valve steam seal issues. Like never.

Oil leaks yep. BMWs v8s are leaky. Also keep in mind these are getting to be old cars and all cars eventually leak. Even a Honda.