Quote Originally Posted by MetroMPG View Post
Synthetics also offer a small efficiency improvement. Given Mitsu's engineering efforts in that regard, I'm not surprised to see synth specified for these engines.
True, although some owners haven't really outgrown the 5,000km oil change interval out of habit; they still prefer using mineral since they like to keep the engine running on fresh oil, especially in tropical environments. I go for synthetics when budget permits.