[Jros]

Recently had the dreaded oil consumption problem the N52B25 is known for, and it occured in a matter of days that the oil consumption skyrocketed from none in 10k KM to 1 liter in around 50 KM...

This was a good clean B25 cared for, extremely clean, and with less than 100k miles on it.

Awful...

So, i bit the bullet, found a reasonable priced complete N52B30 with 99k KM from an automatic 2005 E90 330i MSV70 with right hand drive, and decided to shove it in my E92 euro manual 325i MSV80 car, left hand drive

I am writing this just for the guys wondering if an EU 325 / AUS 323 can be converted to the B30, the answer is: very very easily!

I kept the wiring loom and ecu from my car, just switched valve covers, MAFs and throttle bodies (MSV70 has differnt plug form factor and possibly pinout) and then plugged the oil return hole for the CCV system, now unneeded.

I swapped my MILVS from the B25 to the B30 too obviously

the engine swap itself is seamless, every thing from the gearbox, flywheel and clutch (kept mine, i had the valeo single mass kit) to the wiring, mounting positions et all is identical.

Keep an eye out for the different oil pan if you buy an auto car engine though, it is a bit differnt shaped and you will have some difficulties with letting it past the subframe if you push the engine in from above and don't lower the subframe like i did. It gets trough but it will give you many opportunities to use your collection of swearwords and profanities.

As long as software: the engine starts and run even on the B25 rom, at least for 325is.

It will run and you will feel a bit of torque gain, but you will have some low rpm high load hiccups, so i higly suggest to contact the awesome guys at 22RPD for custom software, like i did

I guess if you can find a MSV80 330/130I rom and have some skill you could fix it yourself, but i think that for the price asked for, having a tune above that is good.

Good luck to anyone attempting

[Jros]