Most likely, yes. Auto-Rx^® is a relatively slow, methodical cleaner that will dissolve sludge as you drive….that is, if the oiling system is not fully plugged up and the oil pump pickup screen is still open for oil flow. Auto-Rx^® can work only if oil is freely flowing. There is a complete application for sludged motors in the application section of the site. In comparison to the normal or standard application, the miles driven are shorter.

The shorter application guarantees that you don’t dissolve more contaminants than what the host oil and filter can handle. Sludged motors typically take two or possibly three applications. The use of conventional oil is recommended for sludged motors, both in the cleaning phase and rinse phases.

When we say that Auto-Rx^® is a relatively slow methodical cleaner, it means that Auto-Rx^® will dissolve first the contaminants in the highest heat and oil flow areas of the motor. These areas are the working guts of the motor. The less-important surface area within the lubrication system will clean up last, likely in the second application.

After the motor is clean, the use of a smaller amount of Auto-Rx^®, called the Extended Engine Performance dose, should be used with each oil change to keep your motor clean.

You should also consider why you got a sludged motor in the first place. Perhaps it was due to neglect with respect to oil-change intervals. As a general rule, oil change intervals on conventional oils should be every 3,000 to 4,000 miles. Synthetics can normally be run 4,000 to 5,000 miles.