If you have the ability to read people, it's not hard to tell if they are being honest or evasive. For a moderately priced car, a full history that shows consistent care is worth between 1 and 2k dollars over the value of one without any records.

Owners who have records are usually much more in tune with their cars, and I've found the cars with records to be in the best shape overall. As an aside, your level of enthusiasm for the car can help make the sale at a better price point, since the owner may be looking to ensure that the next owner will continue to care for the car as they did.

I've bought both ways (with/without), but a top dollar offer will require significant "proof" of the car's history.

I have a friend who is fanactical about servicing his cars. Over the years, I've purchased three of his Mercedes, and steered my cousin to one of his as well. My wife kids me about seeking out particular owners, not particular cars. BTW, all four were (and are) fantastic cars.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles