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.
- 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?
- What were the various changes through the years in the 2.5 engine mechanically from say 1982 to 1992 in the 2.5 engines?
- Which of those years ('82-'92) were the best ones made (most reliable, longest lasting)?
- 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.?
- 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?
- 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 :)