If the engine is firmly "frozen", locked up, it's likely to require a complete engine rebuild.
Not cheap, not easy.
Best to get a professional hands-on diagnosis of the situation before you either spend the $$, or call the junkyard and sell the carcass for $25.
( 5W-30 ) is the preferred engine oil , according to the 1996 Ford Windstar Owner Guide
Emission diagram for 1996 ford thunderbird 3.8l
On a 1996 Ford Windstar , V6 engine : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
No , A 1996 Ford Explorer is either rear wheel drive or 4x4 capable or ( All Wheel Drive , available with V8 engine only ) A Ford Windstar is a front wheel drive vehicle
1996 Ford Windstar - V6 engine
The 3.0 or the 3.8 engine uses a chain.
On a 1996 Ford Windstar : The 3.0 liter V6 engine is rated at ( 150 horsepower ) The 3.8 liter V6 engine is apparently rated at ( 200 horsepower )
Do you have a 3.8 engine for a 2001 Windstar Ford Van?
I should be able to answer your question if you say which YEAR of Ford Windstar ( I was looking at the 1996 Ford Windstar owners manual and it doesn't have any warning lights above the engine temperature gauge )
There is no carburetor on a 2001 Ford Windstar engine because the engine is fuel injected
According to the 1996 Ford Windstar Owner Guide : With engine oil filter change : Both the 3.0 and the 3.8 liter V6 engines take ( 4.5 U.S. quarts of 5W-30 )
show diagram for firing order for a 1996 ford windstar 3.8 engine