I'm hoping someone on here might be a mechanic and will know the answers to some
of these questions. I've been searching the internet a long time trying to
learn more about these two engines but haven't found much regarding reliability.
1. I read online that older versions of the 2.5 were made of cast iron, thus
the "Iron Duke" nickname. But, I also found something that said later versions
of the 2.5 were changed to aluminum and were less reliable. Is that true? At
what year did they change over to aluminum?
2. What were the various changes through the years in the 2.5 engine
mechanically from say 1982 to 1992 in the 2.5 engines?
3. Which of those years ('82-'92) were the best ones made (most reliable,
4. Also are there any reliability differences between say...a Chevy Celebrity
with a 2.5, Olds Cutlass Ciera with a 2.5, Pontiac 6000 with a 2.5, Buick
Century with a 2.5, etc.?
5. Also, I've heard that earlier versions of the 2.5 had problems blowing head
gaskets frequently, was that ever fixed or do most of them all still do that?
6. And as long as we're on head gaskets....the 2.3 Quad 4 engine also blows
lots of head gaskets from what I've heard, is there any year or type of that
engine that is a GOOD one? Is there any way to make a 2.3 stop blowing head
gaskets?(will having a new engine put in fix it or will the new one eventually
start blowing head gaskets too?) One of my old friends had a 1988 Olds Cutlass
Calais with the quad four and that thing had balls, it beat my 3.1 Lumina Euro
when we raced, plus it got very good gas mileage. Ok, enough! Thanks in
advance to anyone who has the answers to these questions and responds :)