This is a lopsided conversation. Get your buddy whatever he wants. If he is happy with the Mercury, he probably wouldnt appreciate the Mercedes and would probably get pissed the first time a regulator failed. Different strokes for different folks..

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6