The 300SE is a reliable car. 1989.
Somebody has a current post on the subject.
If you do a SEARCH on the subject, you'll get alot of info.
I don't know about KE- engines. (?)
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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents)
*SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD