Oem for sure. Ive read the same issues with MSD dizzys through other forums. Other aftermarket brands have reputations for not lasting all that long. I suggest either a used distributor or a refurbished one as a new oem one is incredibly expensive. There are eBay stores that sell genuine JDM dizzys with low mileage. Ive had one in my car for at least 3 years now without issue.