Shocked to read you recommend API but not surprised. David is a great bu**sh*tter.
Had my JDM WRX EJ20T engine rebuilt by them and it only lasted 12K miles before throwing a conrod through the side of the block. ...and yes I followed all the correct running in procedures, checked the oil regularly, replaced the oil every 3K etc etc.
I'm not alone either ~ because at first my engine was so great that I recommended them to my close friend. He spent even more than I did at API having his STI engine rebuilt/upgraded with Cosworth pistons/rods & other parts. His blew up quicker than mine! He was going to sue API but came to some agreement with them (got cash back) after he had his engine inspected by an ex F1 mechanic who found the problem was down to API using non-Cosworth circlips on his pistons & conrods.
He had his engine rebuilt with a new block (2.1ltr stroker) & Cosworth bits etc by the ex F1 mechanic and it's still running great today almost 5+years later with over 450bhp.
Would not recommend API at all for anything imo.