A while ago, I mentioned the possibility of powering my '90 Loyale with a junkyard EA82 Turbo motor, and said that amongst the possible problem was a design fault in the turbo oiling. I was pretty promptly corrected for saying that, and since I couldn't remember where I knew it from, didn't pursue the matter.
Just now, reading the Amsoil site, I found this"
has published Service Bulletin # 02-103-07 that identifies a factory
design related problem with premature clogging of the oil mesh screen
located inside the oiling system that supplies the turbo charger on all
model turbo charged cars. A clogged screen will result in oil starvation
and turbo charger failure. Subaru has since published Service Bulletin
#02-110-10R indicating that 2010 MY and prior turbocharged engines
continue to require oil and filter change intervals of 3,750 miles
(6,000 km) or 3 3/4 months, while all 2011 MY turbocharged engines have
returned to the original requirement of 7,500 miles (12,000 km) or 7 1/2
months, and they are required to use synthetic oil. Due to the issues
outlined in this document, AMSOIL recommends following Subaru drain