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Perhaps they were saying that the internal plates are thinner than the tubes ............
That's certainly true. But I do believe the OEM round cooler has a thicker sidewall versus the OEM square cooler. Hence why it had a lower failure rate, coupled with higher quality welds and tubing versus the fins.
The end caps are basically the same between the two.
The round cooler, being shorter, has a lot more weight to it than the square unit.
Josh this post reminded me I owe you some egr coolers for your experiment.
Do you still need them? I apologise I was in and out the hospital so much around that time I plum forgot about them.
Didn't know about the hospital, I hope you're doing well now.
I'm kinda tapped out in regards to EGR coolers, but if you're still looking on unloading them we can certainly work something out. Feel free to send a PM with further details.