Oil Change Intervals...again!

[Seeker <bobgir@xxxxxxxxxxxxx>]

    Knowing that what our dads told us about oil change intervals with
regards to mileage and time are probably no longer valid given the changes
in the composition of (non-synthetic) oils and the engines they lubricate,
I'd like to get a sense from the list of what is the maximum TIME interval
between oil changes one should allow?

    To be more specific:  I find myself rarely using one of our BMWs because
of a company-provided car.  I had been changing the oil every 3,500 miles,
which used to occur every three or four months.  I just checked and found
that I last changed my oil about 900 miles, but FIVE months ago.

    Should I switch to a time-change interval vice a mileage-change interval
since I'll be racking up so little mileage on this 92 525i with 90k miles on
the clock?  

    If so, what's a good time interval given today's oils and engines?

    Many thanks,
    Seeker

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