Cooling system runs at 2 bar, thoughts on 1.4 bar?

[SlickGT1]

So yea, ever since I developed that retarded leak in the valley pan area. I have been making up a huge part list and doing a shit load of research. Our BMW cooling system runs at 2 bar. Yes, that is nearly 30 psi of pressure. The new BMW cars, seem to be running at 1.2 to 1.4 bar.

Here is why I am questioning this 2 bar pressure cap on our cars.

I did a cooling overhaul as my expansion tank cracked. I couldn't get to all the hoses, and clearly some gaskets. I replaced the damn cap too. I need to find if I still have my old cap, because I am sort of suspecting that it was not 2 bar.

So, I now have a leak.

Now I have been doing a lot of reading, and it seems quite a few people are switching to the 335i cap, which is 1.4 bar, and the system runs fine.

The industry standard for coolant pressure is 1bar. Thew new BMW are 1.2 bar. I think the 2 bar caps are overdose for our systems, and are actually to blame for the catastrophic coolant hose and component failures.

Does anyone have any experience with putting on a lower pressure relief cap on the e53? This just makes way more sense.