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

AR9100 Oil Additive

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AR9100 Friction Modifier protects and extends the life of engine components by forming a solid boundary lubricating film, resulting in improved power, smoother idling, quieter vehicle operation and extended oil drain intervals.
AR9100 eliminates injector stiction in all HEUI systems including 6.0 & 7.3 Powerstroke.



  • Increases power and response
  • Provides anti-wear, extreme pressure and anti-corrosion protection
  • Protects engine during cold starts
  • Cleans and prevents sludge/varnish deposits
  • Extends oil drain intervals


Deposits and wear in HEUI injectors (Power Stroke 6.0L & 7.3L) cause the injector to become stuck due to static friction, or 'stiction', and can prevent the injector from firing. This causes hard starting, rough idling, smoking, reduced power and response until the engine is warmed up.

Add a 16oz bottle of AR9100 to every oil change to eliminate cold start issues. AR9100 will clean out HEUI injector deposits and create a friction reducing film inside the injectors to ensure all eight injectors fire every time.

For all Power Strokes, use 16 oz of AR9100 every oil change.

For engines, limited slip differentials and motorcylces, use 1.2 oz of AR9100 per quart of conventional or synthetic oil.

For gear oil, hydraulic oil and power steering fluid, use 3.2 oz of AR9100 per quart.

How to treat your engine with AR9100.

100% money back guarantee if AR9100 does not resolve stiction issues in 6.0L and 7.3L Power Strokes after 100 miles.



Add AR9100 Friction Modifier to Your Oil

• Forms a solid boundary lubricating film that improves performance, offers extreme pressure protection and protects engines, gearboxes and hydraulic systems

• Reduces friction, improving efficiency and power. With less friction the system will run smoother, more quietly and develop less heat

• Extends oil drain intervals by improving the oxidative stability of engine oil

• Gently removes and disperses any sludge, varnish and carbon deposits that have built up in the engine


AR9100 Friction Modifier solves misfire and cold start issues in 6.0L & 7.3L Power Strokes

The Problem

Deposits and wear in HEUI injectors cause them to become stuck. This prevents the injectors from firing causing 6.0l and 7.3l Power Strokes to suffer from hard starting, rough idling, reduced power and response, bucking and smoking.

Click here to learn more about stiction

The Solution

Add AR9100 to every oil change to eliminate hard start and drivability issues caused by HEUI injector misfires in 6.0l and 7.3l PowerStrokes. AR9100 cleans out HEUI injector deposits and creates a friction reducing film to ensure all eight injectors fire every time.

How It Works

Engine oil is exposed to very high temperatures and pressures within the Spool valve ('poppet valve' in 7.3l) of HEUI injectors. The oil degrades and forms deposits that cause excessive wear, creating static friction, or 'stiction', which can prevent the injector from firing.

A blend of esters combined with our additive package removes deposits and forms a friction reducing solid boundary lubricating film on the bore of the 'spool valve'. By removing deposits and reducing friction, AR9100 eliminates stiction issues.

100% Money Back Guarantee

Get your money back if AR9100 does not resolve stiction issues in your 6.0L or 7.3L Power Stroke within 100 miles of driving.

BUY AR9100
"Archoil is the real deal"

The next morning, following a 15-degree night during which the truck once again sat outside, it fired right off and idled smoothly. Seeing this F-350 go from a cold-blooded, rough-running basket case to a truck that ran as smooth as it did the day it left the dealership definitely made believers out of us. Archoil is the real deal.

- Diesel Power Magazine // Read the full article



Restore, protect and maximize your vehicle's performance and save up to 30%

AR9100 FAQs

To maintain the products benefits we recommend adding AR9100 to every oil change.

Yes, but if AR9100 is added to used oil which will be drained soon it would need to be replaced at the next oil change. If an oil change is coming up consider waiting until then to add AR9100 so it can be used for a full oil drain, or consider changing your oil when you add AR9100 so it goes in with fresh oil.

When adding AR9100 to used oil, make sure there is room by draining some oil out beforehand. Make sure not to add AR9100 to an already full crankcase, doing so will exceed your engines maximum oil capacity and can cause engine damage. If your dipstick shows that the oil is below the maximum mark, you can usually add AR9100 without draining oil out.

For all Power Strokes remove ½ a quart (16 oz) of oil from the engine before adding a 16 oz bottle of AR9100. If you are adding AR9100 during an oil change use less oil so there is room.

Yes. AR9100 is suitable for use in both synthetic and conventional engine oil.

No, We don't recommend using AR9100 in automatic transmissions.

No. AR9100 will pass through fine oil bypass filters without causing issues as the average particle size of AR9100 is 100 nanometers (1/10 of a micron).

The Magnuson-Moss Warranty Act allows consumers to use additives of their choice without voiding their warranty except for instances where specific additives have been noted as incompatible.

AR9100 should be added to new vehicles after completing their break in cycle in accordance with the owner's manual.

Yes, use 1.2 oz of AR9100 per quart of engine oil in motorcycles with wet clutches. Check the owner's manual beforehand to ensure it does not specify against the use of friction modifiers.

Customer Reviews

Based on 548 reviews
Rick W. (Woodstock, GA, US)


Dan M. (Joshua Tree, CA, US)
Nothing else will do

Been running all your products for five years now. Noticed a Big difference first time I used the 9100. Use every oil change. And your fuel additives as well. Shooting for a million miles on my 3001 7.3. 💪🇺🇸

Donald S. (Murray, KY, US)

Can tell a difference on how my engine runs

Roger R.
Oil additive

Engine seems to run a lot smoother

Zach M.

I have an older diesel pickup and was going to change the injectors again but then ran across Archoil oil and fuel additive. After adding and my next 20 miles, it was like a new engine. I am buying more to put in my tractors.