GWM Tank 300 Wading Depth: The 700 mm Limit and Your Speed at Every Depth

The GWM Tank 300 has a maximum allowable static wading depth of 700 mm. That figure applies to still water, and the safe depth is lower in flowing water. Speed must drop as depth increases: up to 45 km/h in 50 to 100 mm, up to 20 km/h in 100 to 350 mm, and no more than 10 km/h beyond 350 mm, where you must not stop or change gear. Turn off the intelligent start-stop system before entering water, and never attempt to restart the engine if it stalls mid-crossing.

Static depth is not the same as the depth you are driving through

This is the single most misread specification on the vehicle.

The 700 mm rating is a static figure. It describes still water against a stationary vehicle. The moment there is current, or a bow wave, or a vehicle passing the other way, the effective depth rises above the water line you measured.

Waves created by the vehicle ahead of you and by oncoming traffic can push depth past the maximum permissible figure without the water level itself changing at all. That is how people exceed 700 mm in a 500 mm crossing.

Speed limits by depth

The manual gives three bands. Treat them as hard ceilings, not targets.

Above 350 mm, the no-stopping and no-shifting rule exists because both actions interrupt exhaust pressure and can allow water back up the system. Pick your line before you enter and hold it.

Before you enter the water

Preparation is most of the job.

• Confirm the water depth first. If it is deep or unknown, take a detour rather than a direct course.
• Analyse the road conditions. Unfamiliar crossings can hide ditches, washouts and open manholes.
• Turn off the intelligent start-stop system. This is a specific pre-wading instruction.
• Avoid salt water entirely. Salty water, beaches and salt water areas cause corrosion. If you do cross one, flush every affected part with fresh water immediately.
• Understand that wading is not routine use. The manual is explicit that fording should not form part of normal driving, and that it can damage the engine and electrical components.

The rule that ends engines

If the vehicle stalls during a crossing, do not attempt to restart it.

A restart draws air, and if the intake path has water in it, that water goes into the cylinders. Water does not compress. The result is bent rods or worse.

Get the vehicle out under tow instead. That is a recovery problem, not an engine problem, and recovery problems are cheaper.

The post-crossing checklist most owners skip

Water damage rarely announces itself at the exit point. It shows up later.

1. Test the horn.
2. Test all vehicle lights.
3. Press the brake pedal lightly several times and confirm all brake functions work.
4. Do not park immediately. Keep driving for 5 to 10 minutes to prevent rusting of parts such as the turbocharger and the actuator tie rod.
5. While driving, gently press the accelerator and listen for a persistent noise, the sound of metal parts rubbing against each other.
6. Book a routine inspection at an authorised service centre. Water can enter transmission components and dilute the lubricant, which leads to system malfunctions.

That fourth step is the one people ignore. Parking a wet vehicle straight after a crossing is how a turbocharger starts its rust cycle.

Petrol and hybrid are not the same vehicle here

This matters if you are cross-shopping or if your household has both.

The petrol Tank 300 works to the 700 mm static figure with the staged speed bands above. The hybrid version is governed far more conservatively.

For the hybrid, the guidance is that water should not sit higher than the lower edge of the vehicle body, speed should stay at or below 10 km/h throughout, and wading should be treated as an emergency measure rather than something you plan a trip around. The components at risk are different too: motor controller, traction battery pack and transmission system.

If you own the hybrid, do not apply petrol wading figures to it. The 700 mm number circulating in reviews and spec sheets does not transfer across the range.

Questions owners actually ask

"Is 700 mm the deepest I can go?" It is the maximum static depth, so treat it as a ceiling you approach rather than a target you aim for. In moving water the safe figure is lower.

"Do I need a snorkel to reach 700 mm?" No. The rating is a factory figure for the vehicle as delivered. A raised intake changes the risk profile in deeper or more unpredictable water, but the rated depth is not conditional on one.

"Why is my crossing speed limit so low?" Speed creates a bow wave. A bow wave raises the effective water level at the front of the vehicle, which is exactly where the intake and electrical components sit.

"Can I use cruise control or off-road cruise through water?" Depth control needs your own throttle feel. Keep manual control of the pedal so you can hold a steady, deliberate pace.

"The crossing is only 300 mm, can I stop in the middle to take a photo?" Below 350 mm stopping is permitted, but it is still a poor habit. Water finds its way into anything that is stationary long enough.

Prepare the vehicle before the crossing, not at it

Water crossings reward preparation and punish improvisation. Diff breathers extended above the water line, a raised intake where your terrain justifies it, protected electrical connections and a recovery kit you can reach without opening a door all belong in the vehicle before the track, not after the first stall.

For the drivetrain setup that goes with a deep crossing, our guide to engaging 4L low range safely covers the standstill and gear conditions, and the all-terrain modes guide explains which mode suits the ground on either side of the water.

At GWM Accessories we supply aftermarket water crossing and off-road protection gear for the full GWM range, including diff breather kits, underbody protection and recovery equipment. Browse it at gwmaccessories.store.