2015 forester

My wife's got a 2015MY (bought in May 2014) Forester 2.5 recommended oil is 0-20 It's out of warranty and has only 35,000 miles My 2006 Outback 3.0 recommends 5-30 obvi out of warranty and has 135,000 miles Other 2015 models 2.0 and 3.6 recommend 5-30 I do oil changes together. To simplify, can...