Our proprietary formula is a combination of synthetic and premium conventional oils to protect your high-mileage motor against wear, friction, heat, and deposits – the four major causes of engine breakdown. Our premium seal conditioners rejuvenate aging seals to prevent leaks.

75,000 miles Valvoline MaxLife motor oil is designed for high mileage vehicles of 75,000 miles or more. However, it is perfectly acceptable for use in new or used vehicles with less than 75,000 miles.

How much transmission fluid your vehicle needs ranges from as few as 8-9 quarts for small passenger vehicles to more than 20 quarts for heavy-duty trucks. As you do when determining how often to change transmission fluid, check your owner's manual for the transmission fluid capacity.

Engines with newer technology often use synthetic oil and can travel 5,000, 7,500, and even 10,000 miles between oil changes. While more exacting standards in engine-building tech are now in play, the quality of synthetic oils has also improved.

If you own a car that runs on synthetic oil, you're probably wondering, “How often do you change synthetic oil?” Depending on the type of car you have, most synthetic oils last between 7,500 miles and 15,000 miles. However, you'll need to check your owner's manual for more specific figures.

Excessive fluid prohibits proper lubrication and cooling and slows the rotating crankshaft, similar to the effect of running through water. When the air above mixes with the high levels of fluid, it creates a foamy substance that saturates the transmission. This can lead to: Part pitting.

Remove the dipstick again and check the level. The fluid should reach the “FULL” line or be within the hash marks at the end of the dipstick. If not, add a small amount of transmission fluid at a time. Don't overfill it.

Full synthetic oils will actually last well beyond 10,000 miles. The lifespan of synthetic oil depends, but it's not crazy to see oils still working at 15,000 miles or longer.

6 Signs Your Car's Oil Needs Changing

1. Check Engine or Oil Change Light. The most obvious alert that there's an issue with your oil will come from the car itself.
2. Engine Noise and Knocking.
3. Dark, Dirty Oil.
4. Oil Smell Inside the Car.
5. Exhaust Smoke.
6. Excessive Mileage.
7. Change Oil Promptly.

Check the consistency Take a little bit of oil off of the end of the dipstick and rub it between your thumb and forefinger. If the oil is coarse or you can feel any grittiness this is another sign that the oil contains contaminants and should be replaced.

Level is and then another symptom that can happen is that the seals start to leak because there's so much pressure inside of there that is pushing out on all the seals. And so they can start to leak.

Here are the symptoms you can expect to witness when you're low on transmission fluid.

• Grinding Noises.
• Shaking When Shifting.
• Delays Between Gears.
• Transmission Slipping.
• No Shifting at All.
• Transmission Overheating.
• The Check Engine Light.
• It Smells Like Something Is Burning.