AN5 Lubricating oil modifier/stabilizer alkylnaphthalene

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Lubricating oil modifier/stabilizer alkylnaphthalene AN5 (recommended addition 5-10%)

Easy to use for motorcycles and light cars 180ml

400ml easy to use for engines with around 4L of oil

Value-priced 400ml x 2 sets for differentials, transmissions, and engine oil


As an oxidation, heat, stabilizer, oiliness agent, and FM agent for various lubricating oils.
Also, for prevention of oil leakage from old cars, and for prevention of seal thinning of PAO base oil.

As an oiliness agent: 1-2%.
As a stabilizer ~10% (5% recommended)
Add to oil.


Adding it to lubricating oil improves the oil's resistance to thermal oxidation!

Adsorbs to metal surfaces like an ester to improve lubricity!

Improves starting performance in cold weather by lowering the flow point temperature!

Excellent compatibility dissolves and disperses additives and contaminants.

Prevents hydrolysis of ester oils.

It is a multifunctional additive with the effect of helping other additives work.

 It is an alkylnaphthalene equivalent to engine oil 15 and gear oil 75 in terms of the SAE viscosity standard.

Stabilizing function]

In an oxidation stability test, the addition of 15% AN15 to mineral oil alone improved antioxidant performance by approximately 1.5 times.

In addition, a 2.5-fold increase in antioxidant performance was observed when 0.2% ZnDTP was used in combination as an antioxidant.

Antioxidant performance is less than 1/4 of that with AN15 in the test with mineral oil and ZnDTP 0.2% only. (Although there are other products that are more compatible with ZnDTP, we use ZnDTP as an example for simplicity.

Since it is expected to extend lubricant life, it is especially recommended for machines that use expensive oil and for those who want to reduce the frequency of oil changes.

It is especially recommended for machines that use expensive oils and for reducing the frequency of oil changes.
Viscosity data



Viscosity index 74

The main effect of both AN5 and AN15 is to stabilize the oil.

The softer AN has stronger chemical adsorption to the metal surface, and the friction resistance of AN5 is lower due to its softer viscosity, so it is more important for response such as light turning.

AN15 is slightly harder and has a viscosity index of 110, so it can be used as a small viscosity index improver or to strengthen the oil film and compression since it can easily maintain its viscosity at high temperatures.

If the viscosity of AN is lower than the specified oil viscosity, it is recommended to add it to an oil harder than the specified viscosity.

*It has swelling action of packing etc. though it is smaller than ester oil.

*Adding a large amount of 15% or more may upset the balance of additives originally contained in the oil.