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Just because the OEM valve is "all plastic" and "looks like" the ScanTech valve does not mean much. Plastic what? If it's cheap injection molded polystyrene, it may last a year. If it's glass filled reinforced polymer, it might last a decade. The material and forming specs make all the difference. Volvo does spend a lot of time on these and that's usually why the OEM parts last much longer. Take radiator and heater hoses as a good example: compare OEM with MTC. An aftemarket producer can always knock the parts off using the same dimensions but that's about all that is the same.
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See the 700/900 "FAQ" at the menu bar top screen left side.
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