6T70 Malibu Fluid Change: Type, Capacity and Cost

The Malibu owner's manual says it is not necessary to check the transmission fluid level, and that if you need to, you should take the car to the dealer [1][2]. Add a dipstick that reads bone dry when the car is cold, and you get two kinds of Malibu at the shop: ones that have never had a fluid change, and ones somebody overfilled because the stick looked empty. This guide covers which Malibus actually have the 6T70, the fluid GM specifies, the two different refill numbers GM printed, the service intervals, and the drain-and-fill done the way GM's service information lays it out. Numbers in brackets point to the Sources list at the bottom.

Recommended 6T70 parts

Everything a Malibu 3.6 6T70 drain-and-fill needs: GM-spec DEXRON VI by the gallon or by the case for back-to-back services, and a magnetic drain plug made for the 6T70/6T75 so every service shows you what is wearing inside.

ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid, 1 Gallon

$59.99

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ACDelco Dexron VI Full Synthetic ATF, Case of 12 Quarts

$203.99

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Stainless Steel Magnetic Transmission Drain Plug for GM 6T70 / 6T75, Made in USA (Replaces 8654382 / 444613)

$39.99

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Which Malibu Has the 6T70?

Not every 2008-2012 Malibu does, and this is the first place people buy the wrong fluid quantity or the wrong parts. The 2010 Malibu manual lists three engines: the 2.4L four-cylinder, the 3.5L V6 and the 3.6L V6 [1]. Its capacity table shows two automatics: a 4-speed serviced by bottom pan removal at 6.6 L (7.0 qt), and a 6-speed serviced by drain and refill at 5.0 L (5.3 qt) [1].

• 3.6L V6: 6T70, RPO MH2. The 2012 manual names it directly: "3.6L V6 Engine with 6-Speed Automatic Transmission (RPO MH2)" [2]. ATRA's 6T70 introduction lists MH2 as the front-wheel-drive 6T70 code [5].
• 3.5L V6: 4-speed automatic. Pan-drop service, different fluid quantity, different parts. Nothing in this article applies to it.
• 2.4L four-cylinder: the smaller 6-speed family (the 2012 manual lists it as RPO MH8) [2]. Same DEXRON VI, but a different unit.

GM's 3-5-Reverse wave plate bulletins list the 2008-2009 Malibu among the vehicles built with the 6T70/75 (RPO MH2, MH4, MH6 or MY9) [6], so a 2008-2009 V6 car with the 3.6 is in that population. Check the service parts label in the trunk or glovebox for the RPO code before you order anything.

What Fluid It Takes

DEXRON VI. The Recommended Fluids and Lubricants table in both the 2010 and 2012 Malibu manuals lists DEXRON-VI Automatic Transmission Fluid for the automatic transmission [1][2]. The manuals add a notice that using the wrong fluid may damage the transmission and the damage may not be covered by warranty [2].

One Malibu-specific trap: on a V6 Malibu the hydraulic power steering does not take ATF. Both manuals list GM Power Steering Fluid (GM part 89021184, 89021186 in Canada) for the hydraulic power steering on V6 cars, and note the four-cylinder cars have electric steering with no fluid at all [1][2]. If you are used to GM trucks and SUVs where one jug of DEXRON VI covers both reservoirs, do not carry that habit over to the Malibu.

Why the fluid matters so much on this unit: ATRA's 6T70 introduction notes the design runs a small sump with high fluid turnover, higher energy densities and reduced cooling capacity compared with older GM units, and that DEXRON VI was adopted for its film strength [5]. Every 6T70 shift is clutch-to-clutch, timed by the TCM. Sheared-down fluid changes clutch fill and release timing, and that shows up as soft or flared shifts before anything breaks. Buy a fluid that carries DEXRON VI approval on the label, not a "multi-vehicle" fluid that claims to be suitable for it.

How Much Fluid: GM Printed Two Numbers

This is where the Malibu gets confusing. The 2010 manual gives a single drain-and-refill figure for "6-Speed" of 5.0 L (5.3 qt) and does not split it by engine [1]. The 2012 manual splits it [2]:

GM's 6T70/6T75 service information lands in between: a drain pan that holds more than 5 quarts, and approximately 5 quarts to refill [3]. GM's capacity table for the unit gives a drain-plug range of 4.0-6.0 L (4.2-6.3 qt) and an overhaul capacity of 7.0-9.0 L (7.4-9.5 qt) [3]. Every one of those numbers is labeled approximate. The real answer is the one in your drain pan: drain into a marked container, put back slightly less than came out, and finish the level hot. For buying purposes, a 3.6L Malibu wants six to seven quarts on the shelf for one drain-and-fill.

For scale, GM's wave plate special coverage 14404B lists 9 quarts of DEXRON VI (part 88861037) for the 2008-2009 repair [6]. That is a full teardown with an empty converter, which is why it matches the overhaul capacity and not the drain.

When GM Says to Change It

The 2010 Malibu maintenance schedule lists an automatic transmission fluid change every 50,000 miles for severe service and every 100,000 miles for normal service [1]. GM's severe definition, spelled out in the 2012 manual, is a car mainly driven in heavy city traffic in hot weather, mainly driven in hilly or mountainous terrain, frequently towing, used for high speed or competitive driving, or used for taxi, police or delivery service [2]. A Malibu commuting in summer traffic is a severe-service car by GM's own words.

ATRA's 6T70 guidance matches: a fluid-only service at 100,000 miles for regular use and 50,000 miles for severe [4]. My rule on a Malibu 3.6 is to treat it as severe unless I know otherwise and plan a drain-and-fill every 50,000 miles. Most of these cars are now well past 100,000 on the original fill, which changes how you approach the first service (more on that below).

Why the Dipstick Reads Empty

The 2010 manual states it plainly: on the 2.4L, 3.5L and 3.6L engines, the transmission fluid will not reach the end of the dipstick unless the transmission is at operating temperature [1]. A cold dry stick is normal. Adding fluid until a cold stick reads full is how a Malibu ends up a quart or more overfilled.

GM's level and condition check for the 6T70/6T75 adds one safety note for a car that may actually be low: with the engine off, there must be at least enough fluid to wet the end of the dipstick bullet before you start it, so the sump can fill the components once it runs [3].

Drain-and-Fill, Step by Step

This is GM's fluid replacement and level check procedure, in the order we run it on the lift [3][4]:

1. Warm it up. Hot fluid drains faster and carries more suspended material out with it.
2. Raise the car level and put a drain pan that holds more than 5 quarts under the drain plug [3].
3. Pull the drain plug and drain into a marked container. Write down what came out.
4. Read the magnet and the fluid (next section) before you refill.
5. Reinstall the drain plug at 12 N·m (106 lb in) [3]. Inch-pounds, into an aluminum case. Do not run it down with an impact.
6. Fill through the fluid level indicator (dipstick) tube, which is GM's fill point [3]. Put in slightly less than you drained.
7. Bring it to temperature and cycle the ranges. Park level, set the parking brake, start the engine, hold the brake and move the selector through each range, pausing about 3 seconds in each, then back to Park. Idle at 500-800 rpm for at least one minute [3].
8. Read the level at 180-200 degrees F (82-93 C) transmission fluid temperature on a scan tool [3]. If the fluid is cold, GM says to drive the car in 2nd gear until it reaches the range [3]. Check both sides of the dipstick, read the lower level, and check at least twice. The level should be in the crosshatch; it does not have to reach the top mark [3]. Inconsistent readings mean you should inspect the transmission vent for a clog [3].
9. Reset the transmission oil life monitor if the car has one. ATRA notes it must be reset after a fluid change [4].

Step 8 is the one that gets skipped, and it is the only step that needs a tool most owners do not have. Fluid level rises with temperature [3], so a level set at 100 degrees F will read high once the unit is hot. An overfilled 6T70 can aerate the fluid, and aerated fluid means slow clutch fills and erratic shifts.

If you are tempted to pull the cooler lines to push more old fluid out: ATRA's introduction notes the studded side cover bolts must be re-torqued whenever the cooler lines are removed, and the side cover gasket is not reusable [5]. That is a lot of extra work for a maintenance job. Repeated drain-and-fills get you to the same place.

Read the Drained Fluid Before You Refill

GM's condition check says the fluid should be red or dark brown [3]. Beyond that, look at three things:

• Very dark or black with a burnt smell. GM says to inspect for excessive metal and debris. A small amount of friction material is normal. Large parts or metal particles mean flush the cooler and lines and overhaul the transmission [3]. No internal damage signs: replace the fluid, service the cooler and flush the lines [3].
• Cloudy or milky. That is coolant or water [3]. GM's repair for coolant in the transmission is a teardown: replace the rubber seals, the composition clutch plates, the nylon washers and the converter, rebuild with new gaskets and filter, and flush the cooler lines after the cooler is fixed [3]. A fluid change does nothing for it.
• Steel on the drain plug magnet. Fine gray paste is normal wear. Flakes or chunks are not.

On a 2008-2009 Malibu 3.6, metal on the magnet plus no Reverse, 3rd or 5th points at the broken 3-5-R wave plate. GM bulletin 09-07-30-012F describes it: DTC P0776 and/or no reverse, slip, flare or harsh shifts in 3rd and 5th, caused by a broken wave plate letting the piston over-stroke, normally not before about 20,000 miles [6]. Special coverage 14404B covered it for 10 years or 120,000 miles [6], so on nearly every car it has expired. The bulletin requires replacing the pump fluid filter and control solenoid filter plate because debris from the break can cause repeat damage [6]. That is a case-split repair, not a service.

What About the Filter?

The 2012 manual says to change "the fluid and filter" at the scheduled intervals [2]. On the 6T70, the filter sits inside the case. ATRA's product-issues seminar lists it as non-serviceable, replaced only after an internal repair [4], and GM's wave plate bulletin only gets to the pump fluid filter after removing the transmission and separating the case halves [6]. If a shop quotes a Malibu 3.6 "fluid and filter service" at a maintenance price, ask exactly which part they are replacing.

What It Costs

A DIY drain-and-fill is almost all fluid. At about 6.3 quarts for the 3.6 [2], two one-gallon jugs of ACDelco DEXRON VI at $59.99 each ($119.98) cover one service with a little left for top-off. If you plan two back-to-back drain-and-fills, the 12-quart ACDelco DEXRON VI case at $203.99 covers both. A magnetic drain plug made for the 6T70/6T75 is $39.99 and gives you a clearer read on wear at every future service. Those are our current prices; see the parts module above.

At a shop, the drain is quick. What you are paying for is the hot level check with a scan tool and the oil life reset. A quote that includes both is quoting the real job. For side cover service and exchange machines, see our 6T70 fluid change cost guide and flush vs drain and fill.

One Drain-and-Fill or Several?

Each drain pulls roughly 5-6 quarts of a 7.4-9.5 quart system [2][3], so one service leaves a good share of old fluid in the converter, cooler and clutch circuits. On a high-mileage Malibu with no service history, we drain, refill, drive 50 to 100 miles, and drain again. Two services gets you most of the way to new fluid, and a third gets close to all of it. It is gentler on a unit that has been running on worn fluid, and you get two or three looks at the magnet.

If the car is already slipping, flaring or shifting hard, diagnose before you service. Our Malibu slipping guide and Malibu shift problems guide cover the codes, PIDs and bulletins. Fresh fluid will not fix a broken wave plate, a worn valve body or a burned clutch pack.

Need parts for this job?

Our 6T70 parts page has DEXRON VI by the gallon or case, a magnetic drain plug made for the 6T70/6T75, and valve bodies and rebuild kits for when the magnet says it is time, all on our own checkout. For fluid specs across every unit, see the transmission fluid spec chart.

FAQ

What transmission fluid does a Chevy Malibu 6T70 take?

DEXRON VI. Both the 2010 and 2012 Malibu owner manuals list DEXRON-VI Automatic Transmission Fluid for the automatic transmission. Unlike some other GM V6 vehicles, the Malibu V6 hydraulic power steering takes GM Power Steering Fluid, not ATF, so do not mix up the two reservoirs.

How many quarts does a 3.6L Malibu take for a transmission fluid change?

The 2012 Malibu owner manual lists 6.0 L (6.3 qt) for a drain and refill on the 3.6L V6 with the 6-speed (RPO MH2), and 5.0 L (5.3 qt) for the 2.4L 6-speed. GM's 6T70/6T75 service procedure says to expect roughly 5 quarts. Measure what drains out, refill that amount, and set the final level hot.

How often should the transmission fluid be changed on a Malibu?

The 2010 Malibu maintenance schedule calls for an automatic transmission fluid change every 50,000 miles under severe service and every 100,000 miles under normal service. Severe service includes heavy city traffic in hot weather, hilly terrain, frequent towing and delivery use, which covers a lot of Malibus.

Why does the Malibu transmission dipstick show no fluid?

GM's owner manual states that on the 2.4L, 3.5L and 3.6L engines the transmission fluid will not reach the end of the dipstick unless the transmission is at operating temperature. A cold, dry dipstick is not proof of low fluid. Check it with the engine running and the fluid temperature at 180-200 degrees F on a scan tool.

Does a 2008-2012 Malibu V6 have a 6-speed or a 4-speed?

It depends on the engine. The 3.6L V6 got the 6T70 6-speed, while the 3.5L V6 got a 4-speed automatic, which the 2010 manual services by bottom pan removal at 6.6 L (7.0 qt). The 2.4L four-cylinder uses the smaller 6-speed family. Confirm the engine and the RPO code before buying fluid or parts.