It's true—I work as a car concierge. Your description of me as an "auto specialist" who can fill in the gaps in my readers' knowledge makes that seem like the case. I don't think "know vs. don't know" is as vital as "know vs. don't want to bother finding out" - the crux of the matter. Nowadays, readers often get bewildered with millions of car-related advice but for nothing (no matter car leaks, shaking, sputtering, poor batteries, or cracking). By and large, I aim to spread the optimal advice for the economical pick but practical. Hopefully, my all-out efforts would help to tackle your issues utterly instead of making you lose a portion of the money you would otherwise have left on the dealerships' tables.