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.
For a location more convenient to the downtown area, the Hotel Edgewater Seward is ideally situated on the edge of Resurrection Bay and adjacent to the Alaska SeaLife Center. Both properties will allow you quick and convenient access to Kenai Fjords National Park.