No combination of solid fuel-fired appliances are permitted to be vented into an oil-fired or gas-fired flue. Wood is a solid fuel so the man who told you this is wrong and forbidden by code. Now if each appliance had there own independent proper stainless steal liner then both liners could go up the same flue in most cases, but the chimney would need to be big enough to fit them both.

Sorry.

Good to know, Kevin--thanks!

Ask a licensed HVAC contractor who knows code and practices in your area, don't rely on anonymous internet comments. Then someone in the flesh is responsible.

Good advice from Elmer.

The National Fire Protection Association writes all the standards used by all states and most cities in America and adopt them as code. Many states and cities will amend to add or delete some or all of a section as they see fit.

Your situation is covered in NFPA 211. "Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances". The 211 standard section 9.8 "Interconnection" would apply to your question. In this section 9.8.2 states "Unless listed for such connection, solid fuel–burning appliances shall not be connected to a chimney flue serving another appliance."

But I'm just an anonymous internet commenter so seek out someone with the qualification to give safe advise, but not the guy who told you it was OK to do. To be fair to your HVAC inspector the state or city you live in can change the code anyway they want so there is a slim sliver of a chance your city allowed such a connection I still wouldn't do it, not on my life.

"Never assume" is a good rule, but as it turns out I was assuming the wood stove and the propane furnace would share the chimney. That might be what the oil burner inspector meant, but I doubt it. I've learned that propane furnaces are often vented through an outside wall, so in that case the wood stove would have the chimney all to itself.