Nickmpower

I'm interested in a 2014 e350 wagon that I plan to look at tomorrow. There are no service records on the carfax and the selling dealer has none either. I am wondering if there is a way to tell if the oil has been changed as it should. In other cars/engines I've bough it has been possible to look through the oil cap and see the inside of the cylinder head. If it was dark or gunked up it was obvious it wasn't serviced as it should have been. Is this possible on the 2014 e350, or do you just see plastic when you look inside the oil cap hole?

KEY08

You can peer in there, but this is 2020 not 1969

Arrie

In my car you can see the timing chain that runs just below the oil fill hole.

How many miles on it?

kajtek1

1. the car has FSS who will show oil life remaining. Usually FSS gives 13,000 miles or 12 months for oil change, so easy to calculate when it was changed
2. car computer keeps records of FSS reset. All it takes is good scanner.
3. Blackstone lab charge $29 for oil test (including shipping) so it doesn't cost much to have actual test. The only issue is few days it takes.
OILS NEVER SUPPOSE TO BE JUDGED BY THEIR LOOKS !
When I am buying used vehicle - I do blowby and acceleration test. Never bought bad engine.