Nissan four stroke oil Tohatsu/Nissan Four-Stroke Oil Type and Capacity Info Use of synthetic oil is not recommended in 4-stroke outboard engines. Outboards use raw water cooling systems and using synthetic oil may... Source Source Source Source Source Source Source Source Source Source Read Also: Nissan 4 stroke outboard oil Nissan 4 stroke oil Nissan outboards 2-stroke 25 Hp nissan 4 stroke Nissan 2 stroke outboards Fix nissan 5hp 4 stroke