Why Mazda doesn't have recommended tranny fluid change intervals in the maint. schedule - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 22 (permalink) Old 05-30-2006, 07:24 PM Thread Starter
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I was curious why the Mazda owners manual didn't list transmission fluid changes on the maintenance schedules so I contacted Mazda and got a very direct answer. This should save me lots of money. Transmission fluid flushes are expensive. (My dealership also pushes Cooling system flushes too at 60k miles, but that isn't in the Mazda Maintenance schedule either)

Below is Mazda's response:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Subject: Re: Re: Thanks for contacting Mazda (KMM630708V95848L0KM)
From: "Mazdaowners" <mazdaowners@mazdausa.com>

Our engineers have determined that it is not necessary to change the
transmission fluid in your vehicle. If your transmission fluid becomes
burnt or damaged, then you would want to change the fluid. Changing
your transmission shouldn't void your powertrain warranty unless an
authorized Mazda technician determines that that the damage was caused
by an outside influence. I hope that this clears up any confusion you
may have. For a more technical explanation, please contact your local
authorized Mazda dealer.

Regards,

Thom R.
Specialist, Customer Assistance E-Business
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post #2 of 22 (permalink) Old 05-30-2006, 07:28 PM
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Hrm, I'd want to get that in a certified letter from someone that is high up


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post #3 of 22 (permalink) Old 05-30-2006, 07:37 PM
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Transmission fluid changes are cheap. Just do drain refills every other oil change. Just costs a few quarters for the crush washers.


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post #4 of 22 (permalink) Old 05-30-2006, 08:43 PM Thread Starter
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Is an auto trans flush more expensive than a simple drain and refill? My dealer wants $99.95 for a flush.

My dealership also keeps pushing a cooling system flush for $94.95. Which is another item that isn't recommended in the Mazda 6 maintenance schedule (the schedule only recommends inspecting the cooling system every 15,000 miles)


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Transmission fluid changes are cheap. Just do drain refills every other oil change. Just costs a few quarters for the crush washers.
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post #5 of 22 (permalink) Old 05-31-2006, 06:25 AM
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Yes. A simple drain refill is this.
http://www.mazda6tech.com/index.php?option...id=33&Itemid=49

Basically it helps keep the additives in the fluid from being depleted, by refreshing them every 5-10k miles. It's no where near as effective as a flush, but it's alot cheaper, and far less harsh on the overall system.

You can do a similar thing with a radiator drain/refill instead of a coolant system flush.

The one advantage of the flush vs the drain/refills is they exchange about 99% of the fluid. A single drain/refill is only going to effect about 40%-50% at best.


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post #6 of 22 (permalink) Old 05-31-2006, 06:58 PM
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The engineer might be right but judging by how fast the fluid changes color in our transmissions I would say it's better to be safe than sorry and do a change at least once every 2 years or 30k miles. Think about this, if the fluid was so stable why are tranny shops doing big business? Any good tranny mechanic will tell you that heat and the resulting burned, degraded fluid is the number killer of automatics. And we know the trannies (both 5 and 6-speed) run hotter than they should even under normal driving conditions. Also, they don't have a serviceable filter so you'll want the fluid to remain as clean and particle free as possible to avoid clogging. An external filter might help here but I would still do a flush or at least a drain refill. $99.00 every 2 years doesn't seem like much to ensure a smoothly operating tranny.

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post #7 of 22 (permalink) Old 05-31-2006, 11:01 PM
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When we bought our '05 X-terra, the salesguy was quick to point out that the automatic transmission was sealed and the fluid was rated for the life of the car..I didn't see a dipstick under the hood, and the owner's manual said pretty much the same thing, IIRC. But of course, I'm going to change out the fluid at 50,000 miles and go synthetic since we purchased the truck and aren't leasing it.

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post #8 of 22 (permalink) Old 05-31-2006, 11:41 PM
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think i will stick to my every other oil change 3-4 quart flush..


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post #9 of 22 (permalink) Old 06-01-2006, 06:22 AM
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I'd also recommend installing a transmission cooler if you happen to have the 5spd ATX. (Though having it on the 6i or 6spd ATX isn't going to hurt, and can only help as well).


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post #10 of 22 (permalink) Old 06-01-2006, 12:43 PM
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So we should be doing a tranny flush every 30,000 mi or 2 years? because that is coming up for me in a couple months or so and I haven't had one done yet.
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