The engine oil dipstick on a 1995 Ford F-250 with a 5.8L (351 Windsor) engine is typically located on
the top of the engine, near the front. It's usually a yellow-handled dipstick with markings indicating the minimum and maximum oil levels. It's often fairly easy to spot because of its bright color and relatively prominent position.
However, to be absolutely certain, consult your owner's manual. A quick glance at a picture of the engine bay online for that specific model year and engine might also help you locate it visually.
