Aaaahh yes...the great transmission fluid question. A few things here. The only real way anyone can for sure know the answer is to do a controlled test and/or study. Example would be to find say 100 Equinox owners who live in the same type climates and have similar driving conditions, ie normal commuting and...
Best answer: Aaaahh yes...the great transmission fluid question. A few things here. The only real way anyone can for sure know the answer is to do a controlled test and/or study. Example would be to find say 100 Equinox owners who live in the same type climates and have similar driving conditions, ie normal commuting and say no commercial or towing use. Have half change the fluid at 100k miles and half not, then track the results. But that would be complicated and cost a lot of money .So we are left with guessing, anecdotal stories, supposition, and some type of extrapolation of known facts.
1. Transmissions are wear items and will eventually fail. The chance of failure increases as it is used.
2. Lubrication fluids break down over time with use and exposure to heat, cooling, etc.
3. Many people with failing transmissions, ie these are units that are clearly having problems, get the fluid changed as an attempt to fix the problem, then then the failure eventually occurs, the failure is incorrectly assigned to the fluid change.. When in FACT items 1 and 2 are responsible. You can only escape issue 2 if you say change your fluid and filter at say every 40,000 miles. Item one can never be escaped.
4. Metal shavings myth. Changing fluid gets rid of metal shavings and that causes transmission failure. If this is true then why not simply add metal shavings to fluid when it is bottled? This is a variation of Fact 3.
5. New fluid can release built up sludge and that actually can cause new problems. This is why a full flush is NOT recommended. A drain an fill only changes say around 4 out of 12 quarts of fluid.
Suggestion - Drain and fill. Close inspection of current transmission fluid. If very dirty then you may need to do another drain and fill after 500 miles of driving. Then after 500 miles of driving to a pan removal and filter change. The idea is that the new fluid will release any sludge, it will accumulate in the base of the pan and in the filter.
If fluid is in good condition then some time between 1000 and 3000 miles do pan removal, and change the filter.
The key point here is that you mostly have newer fluid in there with a new filter, and with at least two drain and fills you have around a 3/4 of new fluid in there.