AR9100 Friction Modifier
AR9100 Friction Modifier
AR9100 Friction Modifier

AR9100 Friction Modifier

Sale price$44.95

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• Eliminates hard/cold start issues caused by HEUI injector misfires in 6.0L & 7.3L Power Strokes

• Suitable for use in all diesel and gasoline engines

• Forms a solid boundary lubricating film to improve performance and protect engines, gearboxes and hydraulic systems

• Increases power and response

• Reduces engine noise and vibration

• Extends oil drain intervals

Use one 16 oz bottle to treat a Power Stroke

Use 1.2 oz of AR9100 per quart of engine oil

Use 1.2 oz of AR9100 per quart for limited slip differentials

Treat motorcycles, wet clutch or not, at 1.2 oz per quart

Treat gear oil, hydraulic oil and power steering systems at 3.2 oz per quart

AR9100 Friction Modifier

Archoil's AR6500 Diesel Treatment AR9100 forms a solid boundary lubricating film that improves performance, offers extreme pressure protection and protects engines, gearboxes and hydraulic systems. AR9100 is suitable for use in all diesel and gasoline engines and eliminates injector stiction problems in 6.0L & 7.3L Power Strokes.

"Attention Power Stroke Owners - AR9100 Friction Modifier ​is 100% GUARANTEED to eliminate STICTION in diesel vehicles with HEUI injector technology within 100 miles or your money back!" - Bill Hewitt


Deposits and wear in HEUI injectors cause them to become stuck. This cause 6.0L & 7.3L Power Strokes to suffer frmo hard starting, rough idling, reduced power, bucking and smoking. This problem is known to Power Stroke uses as 'stiction' (from 'static friction').


Add Archoil AR9100 Friction Modifier at an oil change to eliminate the issues caused by HEUI injector misfires. AR9100 cleans out HEUI injector deposits and creates a friction-reducing film to ensure all eight injectors fire every time.


If AR9100 does not resolve stiction issues in your 6.0L or 7.3L Power Stroke within 100 miles of driving, get in touch with us and we will refund your purchase.

AR9100 + AR6400-D

Save more when you buy an Archoil Performance Kit. This kit includes AR9100 Friction Modifier (16oz) and AR6400-D Diesel Fuel System Cleaner (12oz).

Use these two products every oil change/5,000 miles to protect your engine and fuel system while also boosting performance. AR6400-D treats 40 gallons of diesel.

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This is the must-have kit for your diesel vehicle, including AR6500 Diesel Treatment (40oz), AR9100 Friction Modifier (16oz) and AR6400-D Diesel Fuel System Cleaner (12oz).

AR9100 eliminates stiction and associated cold start problems in 6.0L & 7.3L Power Strokes while AR6500 provides regular maintenance to your fuel system at every fill-up, combating issues associated with poor quality diesel. AR6400-D provides a powerful, one-tank cleaning service to remove harmful carbon build-up from the fuel system.


Customer Reviews

Based on 63 reviews
Michele Bjerke
This stuff works!

My 6.0L F350 had noisy injectors and maybe lifters. When I would start it the poor thing sounded like a bucket of marbles being shook. NOT ANYMORE!! I had been using the fuel treatment and thought what the heck, let's try the oil treatment. Best money I've spent in awhile.
Thanks to Archoil and where I originally saw/see your products.
Thank you very much,
Happy Holidays,
Dave and Michele

Randy Virgin
Archoil AR9100

Thought I would try this, was using hotshot secrets a while back in my 2006 6.0 f250 been using this instead. The truck starts easy and runs great at 208000 also I use this in my 2013 f150 3.5 twin turbo to protect the turbos being a gas engine is very similar to a diesel engine in the way it works. (The heat and pressure)

Tom Hartley
Straight up awesome sauce.

I used AO for several years on my 2005 6.0. Helped it run like a top. Could DEFINITELY tell the difference. Just upgraded to a ‘22 F450 and wouldn’t go without AO in the 6.7.

2004 6.0 250

last year my wife and me towed a 5000 pound rv 8300 miles starting from Florida to the U.P. of Michigan to the mountains of Colorado back to Florida and no matter how I drove best I could get is 10 mpg!.....This year when I changed the oil I added the AR9100 Friction Modifier and started adding the AR6500 Diesel Treatment ..this year only 6000 miles BUT my mpg has gone up to 12 to 13 ! Same rv same truck !... just to add my 6.0 has been rebuilt and bored over 20 and Bullitt Proofed... Im sold on Archoil !

Terea Bozynski

AR9100 Friction Modifier