My opinion: Our AK trip was an adventure and if oil change was needed I'd have it done and enjoy the trip. And we did have a car repair done in $$$ Anchorage but in a few hours we continued our adventure.
One person spent some unplanned time in Fairbanks, one left his trailer axle on a Yukon road and one was in his 19th day in Dawson Creek getting his bent 5er hitch repaired. And another could not get his Cummins running correctly in Haines so he took the ferry to Victoria. Those were some significant trip delays/changes.