Since it may be hard to tell the age of a junkyard coolant tank, would this be a part to buy new before they're no longer available? Volvo brand tanks are on sale at FCP for $66. That seems like cheap insurance for a known weak spot on the car.
What other parts have high failure rates which we should buy new?
Power steering tank - Mine was leaking, ballooned out from 20 years.
Steering rack universal joint - Mine was horribly rusted.







