VW has been using coolants with 2-eha since 1996, when G12 coolant was introduced on the MY 97 vehicles. A '13 VW would come with G13 coolant which has 2-eha, so your gaskets are safe.
http://www.worldpac.com/tagged/ANTIFREEZE_G013_A8JM1.pdf
Subaru doesn't discloses if they use 2-eha, but it is assumed that being a typical Japanese P-OAT they use sebacate instead of 2-eha. Sebacate just like 2-eha is also a plasticizer, so again ypur gaskets are safe unless you think the factory coolant is eating they away right now.
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Sebacic acid and its derivatives such as azelaic acid have a variety of industrial uses as plasticizers, lubricants, hydraulic fluids, cosmetics, candles, etc. It is used in the synthesis of polyamide and alkyd resins
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10.2.1Industry Uses
Adhesives and sealant chemicals
Corrosion inhibitors and anti-scaling agents
Intermediates
Ion exchange agents
Lubricants and lubricant additives
Paint additives and coating additives not described by other categories
Plasticizers
Process regulators
Reactant
Surface active agents
https://pubchem.ncbi.nlm.nih.gov/compound/sebacate
The irrational fear of 2-eha is linked to the introduction of Dexcool in MY '96 GM vehicles, and the problems they where having around the time with failing intake manifold gaskets on the revised Buick 3800 V6 engines. GM had started using revised plastic intake manifold gaskets on the 3800 that failed at a high rate right around the time they switched to Dexcool, and everybody attributed these problems to the new coolant and it's new organic acid corrosion inhibitor 2-eha. In fact the new plastic gaskets failed regardless of what coolant was used, as some of the new 3800 engines left the factory with the old green IAT (2-eha free) coolant and suffered the same problems. GM revised the gaskets, and the problems largely went away, however for many people Dexcool and 2-eha are still linked the 3800 leaking gaskets. GM's then heavy use of the now largely obsolete iron engine blocks (which rust when run low on coolant) and wet type intake manifold gaskets (which can leak coolant), as well as quality control issues with radiator/coolant reservoir caps also unfairly tarnished the reputation of Dexcool and 2-eha.