Nah man. Use the Mobil 1 Supersyn 0W-40. You wont find it in the supermarket! Its a 'specialist product' and Mobil limit the number of places you can buy it from. Give a Mobil distributor a call. Look in the YP... Be prepared for a shock tho. Its ~$100 a bottle?
The WRXs that have had bearing failure were the heavily modified ones running at very high speeds (We're talking >200kmh for quite a bit of time!). The oil would turn to water (ie no viscocity) and main bearing #3 is the first to loose pressure from memory cos its shared with the turbo feed.
I dont recommend running Mobil S in your STi, no matter what the OCI lengths are. Thats an expensive car with a very fine engine you got there, so dont cheap out on some sub par oil!!
You can Shell Helix Ultra 5W-40 if you drive your car sensibly. Its about $50/5L from memory, very good value for money, although it is only a Grp III oil. (Still worlds better than the stuff you are using right now). Screw Castrol and their overpriced junk. Their 0W-40 is no better than Shells at almost double the price. I would recommend Motul 300V 10W-40 if you use your car on the track etc...
I suggest you keep your current oil in there for maybe 5000ks max, and then get rid of it.
[ November 16, 2003, 10:59 PM: Message edited by: Leo ]