How to Treat Your Engine with AR9100 Friction Modifier

AR9100 Friction Modifier can be added to diesel and four stroke gasoline engine oil, as well as gear oil/ATF for gearboxes, differentials, transfer cases and hydraulic oils including power steering fluid.

For engines and limited slip differentials, we recommend using 1.2 oz of AR9100 per quart of oil and for all other applications we recommend using 3.2 oz of AR9100 per quart of oil.

Below are some different methods which can be used to treat engine oil without changing the oil and treat engine oil during an oil change.



We recommend treating Power Stroke, Cummins and Duramax engines (with an oil capacity of at least 13 quarts, and up to 16 quarts) with a 16 oz bottle of AR9100, unless you have a bypass filtration system, aftermarket oil cooler or another modification installed which raises your oil capacity. If you have an increased oil capacity, use 1.2 oz of AR9100 per quart of engine oil.

The procedures below can be used to treat any vehicle with AR9100.


Method 1: Add AR9100 to engine oil which is already in the engine

When adding AR9100 to an already filled crankcase, we recommend compensating for the volume of AR9100 to be added by removing some oil from the crankcase if necessary.

Example: When treating an engine which already has oil in the crankcase with AR9100, start by checking the oil level. If the dipstick reads full you should remove some oil as necessary before adding AR9100 to prevent overfilling the crankcase. An overfilled crankcase can cause cavitation and may damage your engine.

Method 2: Pre-treat all oil

You can pre-treat all the oil which will be going in the crankcase ahead of time at 1.2 oz per quart, then just fill the engine according to the dipstick. This method is particularly useful for small engines which have a small oil capacity where it would be hard to measure out the low volume of oil and AR9100 accurately. We recommend labeling any bottles of pre-treated oil which you will store for later.

Example: You have a gallon (4 quarts) and some individual quarts of oil, your engine takes 6 quarts of oil. Add 4.8 oz of AR9100 to the gallon of oil (4 quarts x 1.2 oz per quart = 4.8 oz), and add 1.2 oz of AR9100 to each individual quart of oil. Fill your engine according to the dipstick right out of the bottles, then store the remaining treated (and labeled!) oil for topping off down the road.

Method 3: Pre-treat engine

You can measure out the amount of AR9100 necessary to treat your application and pour it directly into the engine, then fill the engine the rest of the way with oil according to the dipstick.

Example: You have the same gallon and individual quarts of oil to fill the same 6 quart sump as in the previous example. You need 7.2 oz of AR9100 to treat a 6 quart sump (6 quarts x 1.2 oz of AR9100/quart = 7.2 oz of AR9100), add 7.2 oz of AR9100 directly to the engine then add oil until the engine is full according to the dipstick. If you have to top off oil down the road we recommend treating the top off oil with AR9100 before adding it to your crankcase to accurately maintain the intended concentration of AR9100 in your engine oil.

Method 4: Exact measurements

You can measure out exactly how much oil and AR9100 you need and add them to the engine one at a time, or premix them and add them to the engine together.

Example: You know you need 6 quarts to fill your engine, and you have the same gallon bottle of oil and separate individual quarts of oil. You know you need 7.2 oz of AR9100 to treat 6 quarts of oil and you don’t want to overfill the engine. Subtract the 7.2 oz of AR9100 you will be adding from the 6 quarts total oil that you need and you have leftover 5 quarts and 24.8 oz of engine oil that needs to be added along with the AR9100. You can then either mix these measured portions together or add each measured portion to the engine individually. Even when adding a volume of oil specified by the manufacturer you should start the engine, run it for a moment, then shut it down and ensure the dipstick shows that the oil level is where it is supposed to be.


Tips for accurate dipstick measurement:

When the crankcase is full according to the dipstick, don’t forget to start the engine and run it for a moment to circulate the oil that you just added, then shut it off and re-check the oil level and add more oil as necessary.

Also, remember some engines need a minute to let the oil settle in the pan after shut down before you can get an accurate dipstick reading. Sometimes the dipstick will show the oil level is low right after shutting the engine off because not all the oil has had time to drain down to the oil pan.

Repeatedly taking dipstick readings can cause oil to cling to the walls of the dipstick tube and cause a false high reading. To prevent this, after taking a dipstick reading you can wait a few minutes until the oil clinging to the walls of the dipstick tube has drained down before taking another reading.

You can also partially insert and remove the dipstick repeatedly, without letting it submerge itself in the oil and then wipe the dipstick off to remove some of the residual oil from the walls of the dipstick tube (essentially cleaning the tube with the dipstick). Once you have ‘cleaned’ the dipstick tube you can take an accurate reading.


If you have any questions about your application, please call us on (203) 265-5700, email or leave a comment below.

AR9100 Oil Additive
AR9100 Oil Additive
AR9100 Oil Additive
AR9100 Oil Additive
AR9100 Oil Additive

AR9100 Oil Additive

Sale price$44.95