I run Delo 400 15/40 in my 2000 Excursion 7.3 and in my big rig. I use either Wix or Baldwin oil filters in both. Run Lucas oil additive and fuel additive also in both. I do an oil anaylsis every other oil change and have no breakdown of the oil. Change oil about every 7000 miles on Excursion about 12000 on the rig. Have been running Delo for about 30 years. This is what I use, hope this helps you out. Have 1.1 million miles on the rig. Good luck