fdurso224

Biggest OCOD issue I've had was bad anti drainback valves causing dry starts with audible tapping. Other factors are the sheer amount of filters they produce. The more you make, the higher the odds of a bad one. Purolator had an issue with tears inside the media a few years ago, yet the MC and Bosch versions made in same places did not.

Fdurso224, you can go from conventional oil to synthetic to conventional to synthetic, but synthetic is superior.

Zylon nailed it. I've had to use a variety of filters over the years depending on what's available for <insert vehicle here>, but will avoid Fram like the plague. After one bad incident (the can sheared away from the base while being screwed on), that plus the drainback stories are enough to keep me away.