Contour Enthusiasts Group Archives Forums General Troubleshooting how often should mtx-75 fluid be changed?

The reason you do brake fluid is it is hygroscopic. (A big EdwardC word that means it absorbs water.) Water in your brake fluid is not a good thing. It lowers the boiling point of the fluid. The reason fluid is used is so it doesn't compress. If water turns to steam (a gas) then your brakes get really spongy, if they are even there at all.

Likewise, water can cause parts to corrode. So change your brake fluid.

Similar for other fluids, such as transmission fluid. While oils retain their lubricating powers nearly forever, the additives only last so long. For example, the additive that combat acids that form in your engine and transmission can get used up. When oil analysis is performed on engine oil (and I suspect transmission fluid) one of the values returned is TBN or Total Base Number. That is essentially a measure of an oils ability to neutralize acids. These additives are consumed until the lubricant can no longer combat acids and they begin to do nasty things to the bearings in your engine or transmission.

So while oil and transmission fluid may be slippery forever, the additives don't last forever, and begin to wear out.

Bottom line, change your fluids.

Since it is rarely cost effective to do the analysis (usually costs as much if not more than the fluid change) it is simpler to just change the fluid in question.

Very cheap insurance, and your car will thank you for it.

TB