How to check transmission fluid on a sealed transmission

Q: How do you know if your transmission fluid is low without a dipstick?

In the meantime, its a good idea to familiarize yourself with the tell-tale signs that you may be low on transmission fluid..

By Ralph Kalal

Table of Contents Show

Why Do We Replace Transmission Fluid?
How Do We Replace Sealed Transmission Fluid?
Can You Check the Transmission Fluid Yourself?
Signs Your Sealed Transmission Fluid Needs Attention
Can you check fluid in a sealed transmission?
Should you service a sealed transmission?
How do you know if your transmission fluid is low without a dipstick?
How long do sealed transmissions last?

If you have a late-model car, it may not have a dipstick for checking the transmission fluid. Not only does this make it difficult to check fluid level and condition, it also eliminates the dipstick tube or opening through that fluid is normally added to an automatic transmission.

Among the makes that equip some of their vehicles with no dipstick automatic transmissions are Acura, Audi, BMW, Cadillac (Catera), Chevrolet (Equinox), Chrysler (300), Ford, Mazda (Miata and MPV), Saturn, Toyota, and Volkswagen. At present, the unifying factor is that the transmissions on these vehicles are all of European design. However, the concept is spreading: the GM built 6-speed automatic used in the latest BMW models also lacks a dipstick.

If the vehicle does not have a dipstick, the transmission fluid must be checked at the transmission. This requires lifting the car on four jack stands; it must be level to check the fluid. There will be a fill plug on the side of the transmission case. This is not the drain plug located at the bottom of the sump. With the transmission fluid warm and your foot on the brake, cycle the transmission through the gears so that fluid is in all of the internal passages. Then, with the engine idling, remove the fill plug. A small stream of fluid should come out. If not, the fluid level is low.

To add fluid, you will probably need a fluid transfer hand pump, such as one manufactured by Mityvac that costs about $25, because there won’t be enough room for a funnel. With the engine still running, add fluid until some begins to pour out, and then—engine still running—tighten the fill plug to the specified torque value.

Some manufacturers, including Audi and BMW, are even more specific in their recommended procedure, insisting that the transmission fluid temperature be between 30 degrees C and 50 degrees C. (86 degrees F to 122 degrees F) when checking fluid level or adding fluid. But the Audi transmission should be cooled to ambient temperature before being refilled after draining.

But it gets even more complicated: some manufacturers require on some models, including Toyota and Volkswagen, that a proprietary scan tool be used to enable opening specific passageways in the transmission before checking fluid level.

Before attempting to check fluid level in a car without a dipstick, be sure that you know the proper, factory-specified procedure. You may be able to find that procedure on the Internet, but the best source of information remains the factory shop manual.

Over the last few decades, the automotive industry has seen some massive advancements, and at Master Mechanic, we’ve witnessed and worked on them all!

Most recently, automakers have focused on simplifying car maintenance in hopes of making life easier for their consumers. Car manufacturers have attempted to create “lifetime” parts, including sealed transmissions. What does this mean for maintaining your car? We asked a Master Mechanic what you need to know.

Why Do We Replace Transmission Fluid?

While you drive, friction materials from your transmissions clutches and bands will make their way into your transmission fluid. Traditionally, auto manufacturers suggested having the transmission fluid changed every 60,000 to 90,000 km. Modern cars, however, have extended service intervals for many reasons. They include:

Simplify vehicle ownership by asking the owner to do less maintenance

Reducing the amount of “used” transmission fluid in landfills
Increase maintenance intervals which reduce overall costs

How Do We Replace Sealed Transmission Fluid?

First off, you’ll know you have a sealed transmission if you don’t have a dipstick to check the fluid. That said, even a sealed transmission needs to have its fluid checked or replaced on occasion. Although this may seem to contradict the name, not having clean transmission fluid can lead to significant expenses down the road.

A sealed transmission doesn’t mean an inaccessible transmission. Your local Master Mechanic can check the fluid of a sealed transmission, however, the vehicle will likely need to be lifted off the ground to do so.

Can You Check the Transmission Fluid Yourself?

Even for seasoned DIY car owners, replacing the transmission fluid in a sealed transmission is not something you want to attempt. A minor mistake could lead to major costs, or worse, permanent damage to your vehicle. You may also risk voiding any warranty you have by attempting to service the transmission yourself. Either way, it’s best to contact your local Master Mechanic if you suspect something is up with your sealed transmission.

Signs Your Sealed Transmission Fluid Needs Attention

If your transmission is suffering from poor fluid quality, you’ll typically notice one of the following symptoms:

A grinding sound when driving or switching gears.
A delay when shifting

Since many drivers are holding on to cars for longer, the aftermarket is poised to service these vehicles and keep them ‘on the road’ for as long as possible. Automakers are aware of this and there is pressure on them to produce longer-lasting vehicles. There are other sealed components on your vehicle and we wouldn’t be surprised to see the number increase.

For now, it’s essential for you to understand what a sealed transmission is and how to recognize if there is an issue with yours. Remember anything in a vehicle can break down, even if the automakers claims it’s a “lifetime part”.

At Master Mechanic, we’re always here to help with transmission maintenance and questions. Contact us to schedule an appointment today.

Can you check fluid in a sealed transmission?

Although it is possible to learn how to check the transmission fluid in a model with a sealed transmission, it certainly isn't recommended. You'll need a lift, a full set of tools, and a lot of know-how–and even then, you risk doing irreparable damage.

Should you service a sealed transmission?

A sealed transmission does need to have the fluid checked or replaced periodically. Although this may seem like a waste of time, the potential consequences of not having this vital part of a vehicle checked can easily rise into the hundreds, if not thousands, of dollars.

How do you know if your transmission fluid is low without a dipstick?

In the meantime, it's a good idea to familiarize yourself with the tell-tale signs that you may be low on transmission fluid..

Noises. ... .

Burning Smell. ... .

Transmission Leaks. ... .

Slipping Gears. ... .

Slow Gear Engagement. ... .

Vehicle Accelerates Poorly. ... .

Check Engine or Transmission Warning Light Is On..

How long do sealed transmissions last?

For some cars and trucks, it can range from as little as 30,000 miles to more than 100,000 miles. Some new vehicles, especially those fitted with automatic gearboxes, have transmissions that are almost sealed shut, with fluid that's meant to last the lifetime of the car.