The better question is when was the fluid changed last? If you don't know, just suck all the fluid out and refill.
The only danger with overfilling is that fluid could barf out of the reservoir.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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