I have bought from ebay.de for over 10 years and had no problems.

Most sellers speak English or have friends that do. It is widely taught in school.

Paypal is the easiest to pay, for small things I sent US dollars and it always made it.

My experience is that in Germany they are very honest.

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)