While not particularly in depth, it is nevertheless an interesting batch of descriptive statistics. The datasets are not well analyzed and the article is a tad unorganized. And makes a conclusion about dead marques that does not follow.
One must consider the type of customer that would actually use YourMechanic.com. Apparently, some guys use the service for oil changes. Which means that these oil changes are out of the dealership special, since the customer would not be using YourMechanic.com to perform the service.
Toyota econoboxes are fairly straightforward. 14mm drain plug. Filters that are often hand removable(unless someone felt like going Hulk and twisted it on tight). Lift up the car, remove right front tire, position drain pan, unbolt plug, unscrew filter, and then do the reverse and then you're done.
The article is not very good at transitioning. The second list of costs, by their own admission, "one-off" costs that skew the mean higher but they do not provide the median. One must also suspect that the first list might not be just oil changes every six months...
Also, that marques were discontinued are not necessarily a condemnation of the vehicles themselves. It is an interesting correlation, but the causal link is not given just by the presence of the correlation. Scion is dead too.
It also used Lincoln when Cadillac was #3 on the first list.
Interesting that Chryslers have trouble starting, as they often use Denso starting system parts. Yes, a little bit of Japan in an American car. lol.