Oil Change Interval for the Slant

Adding oil is fine between oil changes,.but you need to change the oil and filter every 2000 to 3000 miles or every 3 months in my opinion no matter what. Also use an oil with zinc in it or zinc additive with our old /6's. AMSOIL or equivalent is good oil. 10w40 and a good oil filter and you're good to go. I use Hastings oil filters and use the bigger Ford filter, not that you have to use Hasting,.but they are a good filter IMO.