Q: What engine oil should I use? A: Mitsubishi state that Evo's 4-7 should use multigrade semi synthetic or fully synthetic oil graded at SAE 10W30 but climate and car usage have a bearing on what grade of oil to use. For running the car in and up to 4,500 miles it is recommended to use semi-synthetic oil only and then switch to fully synthetic oil. The semi-synthetic oil will allow the engine components to bed in, fully synthetic offers too much protection and won't allow the bedding in process as quickly. It is not recommended to use any oil thinner than SAE 10W30. Suggested makers of fully synthetic engine oil include: AMSOIL, Castrol, Millers, Mobil 1, Motul, Red Line and Vavoline. People have their own favourite brands of oil so no one oil can be recommended. A search on the internet can provide useful information on the merits of each brand. Back to question page