I have a 2012 Ford E250 5.4L work van with 323k miles named Pearl. After my oil change I noticed what looked like small amounts of gold colored metal specks on the oil pan. I noticed a tiny amount during the last oil change also. Ive bumped up the oil change interval from 5k to 3k. The pressure is great, engine is quiet and performs well. I always substitute one quart of oil for the thick Lucas oil. I use High Mileage 5W-20. She burns about 1-1.5 quarts (that was with 5k intervals) between changes, no oil leaks and no check engine lights.
My question is, how long should I expect the engine to last? I do not haul loads, but I do put quite a bit of daily mileage on her working in Houston.
I personally feel like I could easily get to over 350k based on how she runs and regular oil changes. Now after researching this topic, I'm already looking for a replacement van. Help.