The gear whine is typical on a high milage Benz. The car should idle at 800 or under. 560sl's are excellent performers hope you get it in shape. By the way you will become addicted to this web site.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T