This appeal is from the judgment of the U.S. Customs Court, 81 Cust. Ct. 87, C.D. 4772, 462 F. Supp. 378 (1978), which sustained the importer-appellees’ claim that the imported product, a petroleum derivative, should have been classified as naphtha under item 475.35 1 of the Tariff Schedules of the United States [TSUS] rather than as motor fuel under TSUS item 475.25.2 We affirm.
Background
T.D. 66-23(13) (1966)3 describes the critical properties of materials chiefly used as motor fuel in internal combustion or other engines in the United States at the time of the importation in question. For *131aviation gasoline, one of the four categories of motor fuel in T.D. 66-23(13), seven characteristics are listed. Upon importation, the Customs Service tested a sample of the imported merchandise for four of these properties. Finding the imported product to fall within the T.D. 66-23(13) range for aviation gasoline for these four items, Customs classified the imported product as motor fuel under TSUS 475.25.
The importer challenged this classification claiming that the imported product fell outside of the T.D. 66-23(13) guidelines, and therefore could not be used as motor fuel and should have been classified as naphtha under TSUS 475.35. At trial the importer introduced test data obtained from samples taken in the ordinary course of doing business: (1) Just before the tanker left Aruba, and (2) after the merchandise had been unloaded into a storage tank in New Jersey. All these tests indicated that the product fell outside the ranges reported in T.D. 66-23(13). The importer theorized that the sample taken by Customs must have been contaminated. With regard to the 10-percent distillation temperature reported in the importer’s tests, the importer offered uncontroverted testimony that it would be difficult if not impossible to start a motor with a substance with such a high 10-percent distillation temperature.
Customs Court Decision
The Customs Court held that the presumption of correctness which attached to the Customs Service classification was rebutted. The court based this decision on the failure of the Government to test for each of the properties listed in T.D. 66-23(13). In support of this holding, the court noted that the Government’s own witness, the Government chemist who performed the testing for Customs, admitted that by themselves the four properties tested for were insufficient to support a determination that the imported product was motor fuel.
Weighing the various test data before it, the Customs Court found that the preponderance of evidence supported the conclusion that the imported merchandise fell outside of the T.D. 66-23(13) standards for motor fuel. Since the imported product was only a blending agent used in motor fuel, the court held that it was not itself motor fuel. Accordingly, the Customs Court sustained the importer’s claim that the imported merchandise should have been properly classified as naphtha under TSUS 475.35.4
Issues Raised on Appeal
Essentially the Government makes two arguments on appeal. First, it maintains that TSUS schedule 4, part 10, headnote 2(b)5 *132should be interpreted as covering within the definition of motor fuel a product which when combined with additives is chiefly used as motor fuel. Since the importer did not introduce evidence that the imported merchandise with additives was not chiefly used as motor fuel, the Government contends that the importer did not rebut the presumption of correctness which attached to the Customs classification of the merchandise as motor fuel.
The Government also argues that the Customs Court erred in holding that all the requirements of T.D. 66-23(13) had to be met in order for a petroleum product to be classified as motor fuel. In this regard the Government maintains that T.D. 66-23(13) was merely published for guidance and can neither expand nor constrict the scope of the statutory definition of motor fuel found in TSUS schedule 4, part 10, headnote 2(b).
Opinion
i
In California Oil Co. v. United States, 29 Cust. Ct. 44, C.D. 1442 (1952), the Customs Court held, inter alia, that a blending component, use in gasoline motor fuel but not suitable for use as motor fuel, was not chiefly used as motor fuel. Since then Congress has added a definition of the term motor fuel in TSUS schedule 4, part 10, headnote 2(b).
“Motorfuel” (item 475.25) is any product derived primarily from petroleum, shale, or natural gas, whether or not containing additives, which is chiefly used as a fuel in internal combustion or other engines.
The Government contends that this definitional section was intended to overrule the California Oil decision. We disagree.
Headnote 2(b) provides that to be motor fuel a product must be “* * * chiefly used as a fuel * * *” (italic added). This wording is consistent with the California Oil ruling. Had Congress intended to change the law, and broaden the meaning of the term motor fuel to include substances which are not suitable for use as motor fuel, but are used in motor fuel, they could have used the wording, chiefly used in a motor fuel, instead.
The inclusion of the phrase “* * * with or without additives * * *” in headnote 2(b) does not support the Government’s interpretation of headnote 2(b), that is, that motor fuel is a product which when combined with additives is chiefly used as motor fuel. The plain meaning of the phrase “with or without additives” in headnote 2(b) is that the presence or absence of additives will not alter the classification of a product which would otherwise be classified as motor fuel.
The Government has failed to bring to our attention anything in the legislative history of the TSUS that would indicate Congress meant to overrule California Oil by adding the headnote 2(b) definition of motor *133fuel. The explanatory notes to the Tariff Classification Study merely state: “Also, the term ‘motor fuel’ has been defined.” Tariff Classification Study, schedule 4, page 167 (1960).
The only particular portion of TSUS legislative history relied on by the Government is a letter written by attorneys for Imperial Oil and published in Tariff Classification Study, schedule 4, pages 355-59 (1960). This letter does not support the Government’s position that the alternative classification, pressed by the importer and adopted by the Customs Court, TSUS 475.35, naphthas derived from petroleum, shale, oil, natural gas, or combinations thereof (except motor fuel), does not include naphthas used in motor fuel. Not a single reference to motor fuel, its definition, or the California Oil decision, is found in this letter. The letter is primarily concerned with a completely different subject, the tariff treatment of hydrocarbons formerly made from coal tars but now primarily made from petroleum which are used as raw materials in the petrochemical industry. The only reference to naph-thas in the letter is a proposal, supra p. 356, that having narrow boiling ranges which are commercially useful as solvents be taken out of TSUS item 475.35 and classified by predominant hydrocarbon component.6 If anything this paragraph would seem to indicate that the term naphtha as used in TSUS 475.35 is a very broad term covering many things, the import of the paragraph being that it covers too much.
To sum up, we agree with the Customs Court that there is a distinction in the tariff law between petroleum products used in motor fuel and petroleum products used as motor fuel, and only the latter are properly classifiable as motor fuel under TSUS 475.25 as defined in TSUS schedule 4, part 10, headnote 2(b). Since the imported product is unsuitable for use as motor fuel (its 10-percent distillation temperature is so high that it would be difficult if not impossible to start a motor with it), the Customs Court was correct in not classifying it as such.
ii
The Government also challenges the Customs Court’s holding that all the requirements of T.D. 66-23(13) had to be met for a petroleum product to be classified as motor fuel. The Government is, of course, correct that the statutory definition of motor fuel contained in TSUS schedule 4, part 10, headnote 2(b) determines what is or is not a motor fuel. However, this does not negate the significance of T.D. 66-23 (13). The definition of motor fuel in headnote 2(b) requires that the product be “chiefly used as a fuel in internal-combustion or other engines.”
*134The listing of critical properties of motor fuels in T.D. 66-28 (13) constitutes evidence of what characteristics a petroleum derivative must possess to be suitable for use as a motor fuel, and is therefore a tool in determining whether or not the requirement of headnote 2(b), that the product be chiefly used as motor fuel, is met.
Properties listed in T.D. 66-23(13) are not irrefutable. The Government and the importer are at liberty to establish that a standard listed as critical is really unimportant.7 However, in the case at bar no such showing was made. To the contrary, the Government’s own witness, the actual Government chemist who conducted the testing for Customs, admitted that all the properties listed in T.D. 66-23 (13) for aviation gasoline had to be known to determine whether or not a substance was aviation gasoline. Therefore, we conclude that the Customs Court was correct in holding in this case that the classification of merchandise as motor fuel under TSUS 475.25 required that each of the properties listed in T.D. 66-23 (13) be met.
Accordingly, for the reasons stated herein, the judgment of the Customs Court is affirmed.
475.35 Naphthas derived from petroleum, shale oil, natural gas, or combinations thereof (except motor fuel)____ 0.25(S per gal.
475.25 Motor fuel___ 1.25(1 per gal.
T.D. 06-23(13) Motor fuel. Standards for classification of naphtha-type and kerosene-type materials as motor fuel. — The following table captioned “Critical Properties of Materials Chiefly Used as Motor Fuels in Internal Combustion or Other Engines in the United States” is published for the guidance of Customs officers in identifying petroleum materials which are chiefly used as motor fuels as defined in schedule 4, part 10, headnote 2(b), and classifiable under the provision for motor fuel, in item 475.25, TSUS. Classification of an inported petroleum product as a motor fuel under item 475-25, TSUS, would be indicated if for each of the properties listed in the table for a given type of motor fuel, the corresponding properties of the imported product fall within the ranges set out in the table for that type of motor fuel. The standards for motor fuels contained herein supersede any standards previously published by the Bureau for petroleum materials chiefly used as motor fuels. These standards in the table will be reviewed periodically and revised, when appropriate, to reflect any change in chief use of such materials.
Critical Properties of Materials Chiefly Used as Motor Fuels in Internal Comrustion or Other Engines in the United States
(For use in classifying imported naphtha-type or kerosene-type materials)
Aviation
Turbine fuels
Automotive Military JP-4 Military JP-gasoline Gasoline commercial commercial all grades all grades jet B jet A & A1
Minimum to maximum range limits
Gravity, “API, ASTM D-237_ 50.3-07.7 64.0-76.2 49.1-50.5 30.5-46.0
Distillation, ASTM D-86:
°F at 10% D+L__ 103-135 138-105 180-240 352-394
“Fat 50%__ 185-233 174-220 232-300 392-432
“F at 90%. — ... 301-358 213-200 331-408 424-495
Reid vapor pressure, psi ASTM D 320........ 7.5-13.2 5.8-7.0 2.0-2.9 0.0-0.5
Octane (research) ASTM D O90S.. 83.1-103-3 81-105....
Octane (motor) ASTM D-S57_ 79.5-99.0 81-105...
Freeze point, °F, ASTM D-1477.. .— (-110M-76) ( — 09)-(—48)
Olefins, volume %, ASTM D-1319 _ 0-2.9 0.0-4.5
Appearance_ Clear and bright
Bureau letter dated Jan. 19,1966. (418.114)
There was never any dispute over the fact that the imported merchandise is described by the generic term naphtha.
See infra.
We believe that petroleum naphthas having narrow boiling ranges and commercially used as solvents, which are commonly designated according to the predominant [sic] hydrocarbon component, such as heptane, hexane, and pentane, are covered by item 475.35 in your draft of schedule 4, but that they would be more specifically provided for by our suggested items 475.36,475.38, and 475.40.
See Cities Service Oil Co. v. United States, 16 Cust. Ct. 110, C.D. 994 (1946) (a petroleum derivative falling outside the viscosity standard for fuel oil was nonetheless classified as fuel oil because this deficiency could be compensated for by preheating the imported product).