Potentially stupid question, but why change the oil in the gearbox at all? Are there symptoms of wear or imminent failure or is it purely preventative?
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Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63
Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate
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