I've been running Castrol GTX in the Dart for a long time. I always used 4 quarts of 10W-30 and the last quart was 5W-30. Wix filters the whole way.
This last oil change, I stepped up to Castrol Full Synthetic. In came in a 5 quart jug so she's runnin' 5 quarts of 10W-30.
Where do I get these ellusive zinc additives I'm always hearin' about? I'd love to get in on that.
