I have a 1995 Maxima with 132K on it that belonged to a family member. The oil was very dirty (black) so I had it changed. My dealer told me they recommend doing a pressure flush of my engine. They said my timing chain could be damaged by old oil. Is this necessary and/or effective? I am skeptical when a dealer tries to sell you additional services, but maybe they're right on this one. Anyone know?
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