I bought a '94 E250 van, 4.9 L strait 6 and I’m pretty sure the oil hasn’t been changed in well over a year. What’s the best way to proceed with an oil change?
Should I flush? If so, with what?
Some say flushing loosens up too many clumps at one time and 2-3 regular oil changes @ 1,000 miles apart will do the job.
What do you guys think?