High interval oil changes typically involves 1. base stock that won't break down and sludge in that interval, 2. adequate detergents and sacrificial metals to last that interval, 3. filters large enough to capture the expected amount of dirt. 10-11g capacity is typically good for up to 12,000 km and 30g up to 40,000 km.
Mobil 1 has their Extended Performance 24,000 km oil & filter and Amsoil Signature Series oil & filter is good for 24,000 km in severe service and 40,000 km or 700 hours in normal service. So if they specified the right type of oil and filter, 35,000 km is no problem. I've never heard of two year oil though.