We are dropping the lower unit on our Mercury OptiMax to install a new impeller and new gaskets. We also give step by step instruction on how to change the g The oil needs to be changed every 30,000 to 50,000 miles, unless your owner’s manual states otherwise. The differential is a part in your vehicle that compensates for the difference the inner wheel and the outer wheels travel when you turn a corner. If you have a rear-wheel drive vehicle, your differential will be in the back with its own In automatic transmissions, the suggested service interval is about every 30,000 miles or 30 months. You must change the automatic transmission fluid sooner if the dipstick reveals a dark or burnt-smelling fluid. Find gearbox specialists near you. We can help you find local gearbox oil change specialist garages. If you have identified that your Don't overfill or underfill the gearbox, engine oil or differential. Fill the gearbox until the oil BARELY begins to seep out of the hole in the side of the box. Then, let the car sit for a few minutes or so and check it again. With or without overdrive, that's how you do it. Although, when I enquired at the local dealership they said that it should be done about every 40k miles (and uses 7-8 litres of oil). Strange ! They also recommended that I use Castrol Dexron III because it's what they use. My car has done about 103k miles so I guess I can hold for about another 10-15k miles. 5.5M views 3 weeks ago. Join Burgo from the Nulon Motorsport garage as he takes you through the easy steps on changing your gearbox oil. With this info you have no reason not to att OMJMZO. Don't overfill or underfill the gearbox, engine oil or differential. Fill the gearbox until the oil BARELY begins to seep out of the hole in the side of the box. Then, let the car sit for a few minutes or so and check it again. With or without overdrive, that's how you do it. Manual guide for gearbox oil replacement – step by step. You can read recommendations on how to manually change the gearbox oil in your car manual. It gives you tips for checking of this specific oil level and where to find the drain plug for the gearbox oil. Once you have the gear oil, locate the fill plug on the side of the differential. Using a ratchet and socket, remove the fill plug and allow the old gear oil to drain out. Next, clean the area around the fill plug hole with a rag to remove any dirt or debris. This will help ensure a tight seal when you replace the plug. Start the engine. Shift the gear selector into the corresponding mode – “Park” or “Neutral”. Unscrew the inspection plug at the bottom of the gearbox. If the fluid leaks out of the hole, there is no need to top it up. Screw the cap back in. If nothing leaks out, this means there isn’t enough oil. If you change your transmission oil, you should also replace the filter to make sure that any remaining particles are filtered out. Common Castrol gear oil types are 75W90, 80W90, and 75W140 for automatic transmissions. You need to find out which oils are approved and which one is currently in your vehicle.

how to change gearbox oil