I believe people have said the real Mercedes line was updated. That may be so for the similar line sold by the VW dealer.

You can actually leak off enough fuel that would have covered the cost of new lines.

The other issue is if the nipples got nicked while removing the old lines.

I don't know what size they are but there is some diesel SUV that used tiny spring clips on the return lines.

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84 300D, 82 Volvo 244Gl Diesel