I say pass on both and keep looking. That is unless they can prove the 3.5 engine was either replaced or rebuilt by a reputable shop.

My E300 get about 30 mpg in mixed driving, and the Jetta gets 42-45. A/C runs constantly in both cars.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
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