My dad's car (7th gen civic) been spec'ed for 5W20 since bought new, and it has received a mixture of 5W30/5W20 all through it's life as a workhorse so far (got 140,000kms to date since bought about 9yr ago).
thin oil (like xW20 does not kill the engine from what I can see and those propagandists on the internet that proportedly claimed (cried foul) about 5W20 will grind down the engine are all but missing (more like they have to eat their humble pie) after so many millions/billions of miles clocked by the unknowing general public that have their OC done by dealerships using bulk 5W20, incl. Ford, etc.)since 5W20 was introduced.
So bottomline: are you still worried about 5W20/0W20?