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2davidc8's avatar

How often should the brake fluid in your car be changed? How about the differential oil?

Asked by 2davidc8 (7772points) October 9th, 2013

I’m talking about an average passenger car, not a truck, van or bus.

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6 Answers

2davidc8's avatar

Oops, please move this question to “General”.

gailcalled's avatar

At the orange bar across the top of this window, at the far right, you willl see “Contact.” Hit that to ask the mods to move the question.

dabbler's avatar

I’m not a mechanic, but my impression is that brake fluid and differential oil are both more or less permanent these days. You’d replace them if some was lost during a repair.

…If they are replaced I’d expect it would be at one of the super-major intervals like 80,000 miles.

jerv's avatar

Most cars I’ve had required topping off those 2 as needed, but never an actual change unless something contaminated the fluid. The most maintenance-intensive vehicle I owned in that respect required checking the differential oil every 90k miles.

kritiper's avatar

The owner’s manual or service manual will tell you when to change the gear oil. Brake fluid shouldn’t have to be changed unless it has become wet or otherwise contaminated. Your manual will tell you about that, too.

2davidc8's avatar

Thanks, everybody, for your replies. I was asking because I have a used car that did not come with an owner’s manual, and it’s so many years old that I couldn’t find the manual online, either.

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