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Maintenance @ 15K 2010 Forester Severe Driving

georged4georged4 Posts: 34
My independant shop said Subaru recommends fluid changes at 15K under Severe conditions. I live in Western New York (Buffalo). The shop said just this area s considered severe because of all the moisture.

Does that sound reasonable or did I pay for service not really needed. I don't tow or off road but it does get frequent short trips.

Comments

  • xwesxxwesx Fairbanks, AlaskaPosts: 8,569
    What fluids did you have changed? The best way to know when and what to change is to send oil samples (such as engine, transmission, differential) to a laboratory for evaluation. Once you establish a baseline, you'll know with confidence that the schedules you choose are effective for both your car and your pocketbook!
    2010 Subaru Forester, 2011 Ford Fiesta, 1969 Chevrolet C20 Pickup, 1969 Ford Econoline 100, 1976 Ford F250 Pickup, 1974 Ford Pinto Wagon
  • georged4georged4 Posts: 34
    Changed brake fluid, transmission and differentials.
  • xwesxxwesx Fairbanks, AlaskaPosts: 8,569
    Overkill, I'd be willing to bet, for all three.
    2010 Subaru Forester, 2011 Ford Fiesta, 1969 Chevrolet C20 Pickup, 1969 Ford Econoline 100, 1976 Ford F250 Pickup, 1974 Ford Pinto Wagon
  • aathertonaatherton Posts: 617
    "My independant shop said Subaru recommends fluid changes at 15K under Severe conditions. I live in Western New York (Buffalo). The shop said just this area s considered severe because of all the moisture. Changed brake fluid, transmission and differentials. Does that sound reasonable or did I pay for service not really needed."

    I think that level of service was not all needed at 15,000 miles. It is not on the Subaru maintenance schedule.

    The differential oil should be checked at 15,000 miles. The rear differential oil usually has darkened by then and is worthwhile to change.

    Brake fluid can absorb moisture in very humid climate, related to time not miles, and could be changed every 2 years. But very few people do that.

    The maintenance schedule merely says to inspect the transmission fluid for its level and condition at 30,000 miles. Transmission fluid need not be changed at 15,000 miles unless overheated and darkened by severe trailer towing. And it cannot be replaced by a simple draining, which removes only 4 of the 10 quarts. Complete replacement of 10 quarts by a special machine costs around $200.

    I think you paid for service not needed, except for the rear diff, which I think should be replaced sooner than the schedule says.
  • ateixeiraateixeira Posts: 72,587
    For gear oil I have 2 reference points:

    60k miles on my Forester was OK
    28k miles on my Miata was too long

    But...the Forester was about 5 years old, while the Miata was 8 years old.

    So in my experience it had more to do with the age of the fluid.
  • aathertonaatherton Posts: 617
    edited July 2011
    "... So in my experience it had more to do with the age of the fluid."

    Gear oil does not age. It weakens from shear and becomes contaminated with wear particles. That is, it becomes thinner and darker.
  • ateixeiraateixeira Posts: 72,587
    I imagine it was contaminated with moisture, over time, and then deteriorated badly.

    Just 28k miles, though.
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