5000 Mile Mobil 1 Change Interval

[Christopher Gharibo <cgharibo@usa.net>]

I have a '91 Audi CQ 20V (55k miles) and a '98.5 A4 30V (13k miles) that I
have been maintaining on Mobil1/Audi Filters every 3000 miles.

I want to increase this to every 5000 miles without hurting the life of the
engine.  My question is am I causing a meaningful decrease in engine life by
going to 5000 miles?  I would like to get the lists' opinion.

Assume NJ weather, oil always topped up, both cars not driven that hard.

Thanks.

Regards,

Chris Gharibo

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