If turbo Volvo’s had piston slap then -
1 The piston slap did not really compromise engine life. And
2 The cure was probably worse than the disease.
Our 90 744 with piston slap was driven to 225K miles and only sold it because it was no longer needed - the woman I sold it to drove it to 275K miles before she moved to another state
I wish I still had it.
I met a guy that was given a 744 turbo because the owner thought the engine was going to blow up, 100 K miles later he was still driving it.
If the slap goes away when the engine gets warmed up, just keep driving it.
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