Pretty much all new cars these days have radiators with plastic tanks, and have had since about the late 80's. I don't see any real benefit in it, apart from lighter weight and possible cheaper production costs.
While the car manufacturers can be blamed to a certain extent, what it all comes down to is the production quality of the third party suppliers.
Both Holden and Ford source many compontents from the same suppliers and correct me if I'm wrong, I think radiators is one of them (from Calsonic?), meaning that Falcons aren't exempt from these sorts of problems either.
Same with the noisy diff - It is common knowledge that both Falcons and Commodores have dodgy diffs (moreso in the Falcons for some reason) as they sourced from the same supplier (Dana). I suspect this is the main reason for Holden dumping Dana as their diff supplier and contracting ZF to supply units for the VE.
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