Premium. Here's why.

Five years ago, I wuz down on money and put mid grade gas into my Buick Riviera for a few weeks.

Problem is, the supercharged Rivvies need premium.

Bottom line is that the harmonic balancer came undone.

Even with cheap **** GM parts, the fix still ran to $460.

With Mistress Mercedes and cuckold Chrysler, your fix could run much higher