I am another lucky one who has suffered from a rod bearing failure. I stepped up the ladder. Sold my 02 2.5rs And i needed to go turbo so i purchased an 04 wrx stock with 130k miles in january of 2012. I thought i had it all figured out. Went to get a tune up, through in some 5w30 oil, cuz thats what the manuel said i should use. In march flashed to a cobb stage II ots map, literally a week later, one of the rod bearings went. I heArd that dreaded noise u see on those youtube videos of when rod bearings go... Mind u in NYC traffic. Luckily i was near an exit and got the car towed to a shop. Dont know if it was neglegence on my part or just piss thin oil f**ked me over.
I have now rebuilt the engine with a 2.5L bottom end, machined stock heads (chambers opened up), Mahle stock sized pistons and a 16g. The cars noisy on start up and after it warms up still a bit noisy. So fAr 10k miles on engine & ive been running mostly 15w40 oil. Car made to Arkansas & back (NY) this summer so go figure..