From your link:

“The 4.3 L V6 that came out in 1982 did have a denser head bolt arrangement, and did not suffer the catastrophic head sealing failures of the V8.”

V6 diesels were put in Cutlass’ until at least 1984:

https://en.wikipedia.org/wiki/Oldsmobile_Diesel_engine#V6

But not in 1981 which is the year we're talking about

Ah, just 1981, got it.

Whatever. It got sent to the crusher and we never bought an American-made car ever again.

Sounds about right. Those engines ruined diesels for Americans.

A friend of mine had one as his high school car, but his dad converted it to gasoline. I think it was in an Olds 88