Before I wrote off my Commodore years ago, I was facing a $900 repair to replace the Welch plugs which required the engine to be lifted out a bit. Coolant was weeping out of two. An otherwise fine block was compromised by these weak points that eventually corrode. That must be the reason the 3800 V6 specified a certain type of coolant.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!