Hi all, I just recently bought my 1st gen and have a couple of questions about everyones oil change intervals. My truck has 238,000 miles on it and I have been using Delo 400 and fleetguard filters for now. I plan to change it to Redline oil in the future. I just put a little over 5,000 miles on the delo and when I changed the oil it came out fairly clear with a black tint. Is that normal for a 12 valve, the oil is always jet black on my 3rd gen. Should I extent my oil change interval? My truck see 300 miles a day/5 days a week and its all highway miles with light loads. Thanks for your help!
Corey
Corey