7500 mile Oil/Filter Change Intervals

[Christopher Gharibo]

I am considering extending Mobil 1 (15W50)/Filter changes from 5k to 7.5
miles.

The cars are '95 A6 12V (100k), '98.5 A4 30V (47k), '91 CQ 20V (85k) located
in NJ and receive highway and suburban driving.

Will this regimen shorten engine life to below 200k miles?

Thanks.

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