Synthetic vs. Standard oil change schedule

I would never try 30K miles, but Amsoil states their expensive synthetic will go 25K miles. What I do is use synthetic for 7500 miles and regular or semi-syn for 5000 miles. Note that Ford recommends your oil should be changed every 5K miles, regardless of whether it is conventional, semisyn or syn. That has been true for 95 - 02 one ton models I own. Based on that I use Motorcraft oil and Motorcraft filter, because Walmart provides both at a good value. For our passenger cars, I use synthetic to the 7500 miles easily.

Today’s oils are extremely good and last longer. I am too cheap to get a regular oil analysis, but if I ran to 25 or 30K, it would be on my list to get done, to make sure the oil can actually take 25K miles, or more.

Your choices may vary. Good luck…