So yeah, I wouldn't necessarily hold this site up as heavily SEO optimized. Nothing against the company as they are a young company just not a good example IMO.
I don't think pumping is necessary. Their site is not a solution to the general case of "car is not starting", thus should not have a page for that. That would be gaming google, which is fine, but a bad first move for a startup.
I'll now call out YC companies to prove my point. I went to the techcrunch demo day round 1, and have a look at http://vastrm.com/ It is a complete SEO disaster. No reasonable advisor would have said that was a good idea for an e-commerce company.
we are getting there :). more like yourmechanic.com/problem/car-is-not-starting - some place where you can all the common reasons etc. There are a lot of things we need to improve.
If we are going to "pump" up the SEO factor, things like https://www.yourmechanic.com/book/#/addj=10021 for "Car is not starting" would not be in place.
Instead, maybe something like https://www.yourmechanic.com/fix/10021/car-is-not-starting
So yeah, I wouldn't necessarily hold this site up as heavily SEO optimized. Nothing against the company as they are a young company just not a good example IMO.