Powerstroke foaming problems with Chevron Delo 400
If you experience foaming it will probably manifest itself as rough running (mostly at idle or just past idle upon acceleration). If that happens, get some anti-foam additive from the International dealer in your area (don't get it from Ford because they will rip you off on the price) and use a different brand of oil at the next oil change. I seriously doubt that it will be necessary to change brands.