It is possible that your husband is right. With an older high mileage car these things do happen. Trust me, I drive a 2002 with 183,000 miles on it. It is not leaking today. Who knows about tomorrow?
Anyways, what you do is stop at the auto parts store and get some engine degreaser. Spray it around the engine block, being careful to (1) follow the instructions on the can and (2) not get it on wires/connectors. And let it do its job. When you have got the engine all nice and clean, drive it a day or two. Then get under it and look for leaks or get a trusted mechanic or the family Mr. Fixit to look. Go from there.
As for the dipstick and piping, these things are generally made of plastic. And things made of plastic that generally do not get along with heating and cooling. It causes them to dry-rot over time. And then they disintegrate when someone touches them or tries to move them. As you said, stuff happens. Especially after 150,000 miles.
Let us know what, if anything, that you find and we will go from there.
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Monday, September 4th, 2017 AT 8:08 PM