I had keys made for both my cars by a little shop locally and the guy went out to the car and tried them himself, tweaked them a little, tried them again and I got out for about 2.50 a key. Have been using them for several years now and they seem to be working just great.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique