My dealer wanted to do a transmission fluid change on my 98 Volvo (186,000 miles) because the color of the fluid had changed from red to brown. My usual repair shop said it shouldn't be changed unless certain diagnostic codes were present. Who is right?
When the colour of the fluid changes it's an indicator of old fluid which must be changed. Too many garages rely on diagnostic codes these days instead of using their brains. The same rule applies to power steering fluid as well.
In any case, a fluid change costs peanuts in comparison to the potential problems which can occur when using fluid which is life-expired. If in doubt, change it.
Transmission fluid needs to be changed just like your motor oil needs to be changed just not so often diagnostic codes have nothing to do with fluid change
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