Quote:
Originally Posted by Delphi
People drive these cars hard as hell.
So the major contributors to rod bearing failure in order of most common cause are as followings. (Note this is only my opinion from my experience)
1.) Oil starvation due to running low.
2.) Oil thinning out (5-30 shearing to 5-20) combined with extended pulls (4th gear highways pulls) causing an extreme amount heat load in the already thin oil basically causing a significant pressure drops.
3.) Mixture of 1 and 2
4.) Oil pickup
5.) Bad luck
thanks for posting.
Not sure about the oil being low. spun #4 and Full synth oil was full. no mods at the time.
My .02
Just read that doing pulls in 5th gear, not good, doing pulls below 3k RPM, not good. Causes the blow by and other bad stuff.
two times found small oil residue in IC hose
Have a 08 wrx I was 2nd owner at 36K miles and at 53K miles the #4 spun. Even though oil was fine, always changed oil around 3k. I had used royal purple. After engine block replaced I stopped using royal purple and did my research , changed to Mobile, Castrol GTX, 1 round of AMS oil, many rounds of Rotella T6 and now onto Motul X-clean- like it.
Now at 112K miles Turbo blew!
had subi mech do a compression test, leak down test to figure out why.
coolant into the turbo. and found head gasket tested leakage.
The day this happend Yep, drove hard.
So from on, drive nicer, and continue to research on engine. Consider Air/Oil separator, .
Really sucks this happend, I really wanted a wide body 2014 WRX. but couldnt find any that were solid.
My 1986 Toyota I drove like a stock car, rally truck, jumped it, drove in the dunes and the only issue was at 178K miles where it broke an exhaust valve (half mooned it) easy fix. So after this WRX, going back to toyota.
sorry for extra ramble.