30 years ago before converting to Mobil 1, I use to run Kendall oil exclusively....
ran it and changed it every 5,000 miles...
but it was a different oil back then.... since it got bought by Conoco Phillips, total different oil as Swift said...
and for regular oil, pretty much any decent oil changed every 6,000 miles or 4 months is pretty effective... but I still prefer synthetic...
Ran a couple of engines well over 250K on Kendall.. don't know how long the engines would have gone tho, as Minnesota road salt consumed the car body before I could find out...
