Archoil AR9100 Oil Treatment
Priced as of May 16, 2026
4.7(5,346 ratings)Subscribe & Save: $38.21 (10% off)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Last reviewed May 16, 2026
TL;DR AR9100 uses a boron-compound friction modifier in a fatty acid ester base — a phosphorus-free chemistry class with tribology literature support for wear reduction. Published peer-reviewed work on boron compounds confirms the mechanism; community tracking at Bob Is The Oil Guy and powerstroke forums shows consistent positive results at 5,000+ mile intervals and corroborating oil-analysis data. Compatible with modern API SP engines and catalytic converters. Health score 8.5/10; Prop 65 warning flagged (paraffin oil component).
What it is and how it performs
AR9100 delivers a boron-compound friction modifier — specifically a nanoborate active in a fatty acid ester carrier — that forms a protective layer on metal surfaces under load. Unlike ZDDP-based additives, the formula contains no phosphorus, meaning it does not affect catalytic converter performance or raise API SP phosphorus concerns. Independent tribology literature confirms wear-scar reduction for the boron-compound chemistry class in standardized Four-Ball testing. Archoil cites brand-commissioned ASTM D2266/D4172 data for this product, but the testing laboratory and protocol are not publicly disclosed. The strongest evidence base is community: multiple BITOG threads with documented Blackstone oil analyses show elevated boron/potassium consistent with additive activity, and powerstroke forums document repeated stiction-resolution results on 6.0L and 7.3L Ford Powerstroke HEUI engines.
Who should buy this — and who should skip it
Best for owners of Ford 6.0L and 7.3L Powerstroke diesel trucks experiencing HEUI injector stiction — cold-start misfires, rough idle, sluggish throttle response — where the full-bottle initial dose has the strongest documented evidence base. Also a reasonable choice for any diesel or gasoline engine owner seeking a phosphorus-free friction modifier with community-corroborated chemistry. Skip it if you expect independently verified, neutral-party laboratory data on this specific product — that level of evidence has not been published. Major OEMs do not endorse aftermarket oil additives; for any vehicle under warranty, review your owner's manual before adding any supplement.
Safety and environmental impact
SDS is EU CLP/GHS format (v2.0.0, Oct 2016). Signal word: Warning. Sole classified hazard at the mixture level: H319 (Eye Irrit. 2 — eye irritation). No inhalation, skin corrosion, or systemic H-codes at the mixture level. The California Prop 65 warning on the Amazon listing reflects a disclosure requirement for the paraffin oil component and does not change the SDS §2 hazard profile. Drain-destined via the oil change cycle — used oil (with additive mixed in) must be taken to a used-oil collection facility, not poured down a drain or storm sewer.
Frequently asked questions
Is AR9100 safe for modern engines with catalytic converters?▾
Yes — AR9100 uses a boron-compound friction modifier with no phosphorus content, which means it does not contribute to catalytic converter poisoning. The brand's TDS explicitly notes the formula benefits modern engine oils where zinc levels have been reduced to prevent catalyst issues. Unlike ZDDP-based additives, AR9100 does not raise oil phosphorus levels and is compatible with API SP specification oils.
What is the correct treat rate for AR9100?▾
Engine oil, limited-slip differentials, and motorcycles: 1.2 oz per quart of oil. For a standard 5-quart engine fill, that is approximately 6 oz per oil change, or roughly 2–3 maintenance doses per 16-oz bottle. Gear oil, hydraulic oil, and power steering fluid: 3.2 oz per quart. For the Ford 6.0L or 7.3L Powerstroke HEUI stiction treatment, use the full 16-oz bottle as the initial dose (these engines hold 13–16 quarts of oil).
How does AR9100 work on Ford Powerstroke HEUI injector stiction?▾
The 6.0L and 7.3L Powerstroke use hydraulically-actuated electronically-controlled injectors (HEUI) that depend on engine oil pressure for activation. Over time, varnish and deposit buildup ('stiction') causes injectors to stick, leading to cold-start misfires, rough idle, and sluggish response. AR9100's boron-compound active is intended to reduce friction and clean internal injector surfaces. Community evidence across powerstroke.org and Bob Is The Oil Guy shows multiple documented cases of stiction resolution with the full-bottle initial treatment.
Does AR9100 appear in oil analysis results?▾
Yes — oil analysis from Blackstone Laboratories and similar services shows elevated boron and potassium levels in oil that contains AR9100. This is expected and normal; the boron and potassium signatures are markers of the nanoborate chemistry being present and active in the oil. These elevated readings should not be flagged as engine wear concerns when AR9100 is in use.
Can AR9100 be used in diesel and gasoline engines?▾
Yes. The product is marketed for all diesel and gasoline engines. The best-documented use case is the Ford 6.0L/7.3L Powerstroke diesel for HEUI stiction, but community evidence from BITOG also covers positive results in gasoline engines, reporting quieter operation and favorable oil-analysis results. There are no documented contraindications for gasoline engines.
Does AR9100 have a Prop 65 warning?▾
Yes — the Amazon listing carries a California Proposition 65 warning. The SDS discloses paraffin oil (CAS 8012-95-1) as a component at less than 15%; certain mineral oil fractions carry Prop 65 listings for polycyclic aromatic hydrocarbons (PAHs) in non-severely-hydrotreated grades. The warning reflects California's disclosure requirement and does not alter the SDS §2 hazard classification, which lists only H319 (eye irritation) at the mixture level.
From the manufacturer
Marketing copy from Archoil, via Amazon. Not editorial.
- •HEUI STICTION FIX (6.0L & 7.3L Power Stroke): Eliminates injector stiction that causes cold start misfires, rough idle, and sluggish response in HEUI systems. One 16 oz bottle treats one 6.0L or 7.3L Power Stroke (13-16 quarts)
- •NOT JUST FOR POWER STROKE: Suitable for all diesel and gasoline engines - ideal for owners who want anti-wear protection and smoother operation
- •TREAT RATE: Engines, limited slip differentials and motorcycles: 1.2 oz per quart of conventional or synthetic oil. Gear oil, hydraulic oil and power steering fluid: 3.2 oz per quart
- •RESTORES POWER & RESPONSE: Reduces friction to improve throttle response and drivability
- •REDUCES NOISE, VIBRATION & HEAT: Quiets operation by improving lubrication under high-load conditions
- •ANTI-WEAR & COMPONENT PROTECTION: Creates a solid lubricating barrier to reduce wear and support longer component life
- •HELPS EXTEND OIL LIFE: Slows oil degradation and prevents sludge and deposits, leading to longer oil life and better engine health
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Manufacturer videos
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Manufacturer specifications
- Material
- Fluid
- Brand
- Archoil
- Package Information
- Jug
- Liquid Volume
- 16 Fluid Ounces
- Item Weight
- 16 Ounces
- Brand Name
- Archoil
- Item Form
- Oil
- Global Trade Identification Number
- 00608819243337
- Manufacturer
- Archoil
- Unit Count
- 16.0 Fluid Ounces
- UPC
- 608819244198 608819243412 608819243337
- Number of Items
- 1
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Top Amazon review
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I recently purchased the Archoil AR9100 Oil Additive and I have to say that I am extremely impressed with its performance. The product is made of high-quality materials and has a number of beneficial properties that have significantly improved the performance of my vehicle.One of the things I appreciate most about the AR9100 is its ability to reduce friction and wear on engine components. Since using this product, I have noticed a significant reduction in engine noise and an improvement in fuel efficiency. The AR9100 also seems to be helping to extend the life of my oil, as it has been able to maintain its viscosity for longer periods of time.The only downside to the AR9100 is that it is quite expensive, especially when purchased on Amazon. While the product is definitely worth the price, I can understand why some people might be hesitant to spend so much on an oil additive. That being said, I believe that the long-term benefits of using the AR9100 more than justify the cost.Overall, I would highly recommend the Archoil AR9100 Oil Additive to anyone looking to improve the performance and longevity of their vehicle. It is a high-quality product that is sure to deliver excellent results. Just be prepared to pay a bit of a premium for it.