Even the specialty motor oil marketers such as Amsoil support the notion that oil additives are not needed. They do not want competition from additive companies because in their mind all you need is their oil.
Census Data for Seward ... Population ... The most recent Census Estimate <1> was for 2016 and it gives Seward a population of 2,787 people. The last Decennial Census <2> was in 2010, giving Seward a population of 2,693 people. The 2010 Census gave Alaska had a population of 710,231 people, meaning that Seward had 0.38% of the total population of Alaska - making it the state's 19th most populous community.
The airport was built during World War II. It was named Walseth Air Force Base and was closed by the United States Air Force in April 1947. It was excessed to the War Assets Administration and taken over by the Territory of Alaska. Seward Airport covers an area of 302 acres (122 ha) at an elevation of 22 feet (7 m) above mean sea level.