I'm looking for information on Romanian use of Polish vehicles during the war. Specifically the 7TP tank.
The Romanians were known to use captured vehicles. Or rather next to anything they could get their hands on due to their lack of modern tanks. I can confirm that Polish armoured cars and the TKS tankette (as an artillery tractor) were fielded. After the Invasion of Poland 7TP tanks were driven into Romania (and the Soviet Union) to escape capture, but after that I can't find further information on what happened to them.
Were they likely scrapped, used for internal security duties or something else? The Romanians used the similar Soviet T-26 tank extensively, so the 7TP doesn't seem much of a stretch to use. Though as did they use such a variety of tanks that they had problems with replacement parts. That they apparently used Odessa "tanks" kind of makes me think they'd take every opportunity at sourcing armoured vehicles, but that's not a guarantee.
I'm not convinced they actually did. Zaloga's "Tanks of Hitler's Eastern Allies" indicates R35s and TK/TKSs making it across with no mention of the 7TPs, and I see a note on a Polish website that whilst 2nd Company of 2nd Light Tank Battalion, equipped with 7TPs indeed made it across the border to Romania, the tanks were worn out and unreliable due to lack of maintenance in the fighting, they were burned in place in Poland and the unit crossed into Romania riding in trucks. I accept that some sites claim 20 tanks made it to Romania, but I'm not sure how authoritative they are.