Approval Details

Valid E.O.


This Executive Order approved the specified parts on on December 1, 1978.
As of Wednesday, October 16th, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

1963-1979 vehicles with external PCV system, without air-cooling or fuel injection.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-86
  • Executive Order 86 / D86
  • ARB # D-86
  • Executive Order No: D-86
  • C.A.R.B. No. D-86
  • Resolution D-86
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-86 PDF

D-86 Document:

                           State of Célifornia
                           AIR RESOURCES BOARD

                          EXECUTIVE ORDER D—86
               Relating to Exemptions under Section 27156
                           of the Vehicle Code

                       FOUR STAR MARKETING, INC.
                                "ROSCO"      ‘

 Pursuant to the authority vested in the Air Resources Board by Section
©27156 of the Vehicle Code; and

 Pdrsuant to the authority vested in the undersigned by Sections 39515 and
 39516 of the Healith and Safety Code and Executive Order G—45—5;

 IT IS.ORDERED AND RESOLVED: That the installation of the "ROSCO" manufac—
 tured by Rosco Filter Air, 2666 Mark Lane, West Linn, Oregon 97088 and
 marketed by Four Star Marketing, Inc. P. 0. Box 188, Canby, Oregon 97013
 has been found to not reduce the effectiveness of required motor vehicle
 poilution control devices and,; therefore, is exempt from the prohibitions
 of Section 27156 of the Vehicle Code for 1963 through 1979 model vehicles
 equipped with external PCV system, without air—cooling or fuel injection.

 This Executive Order is valid provided that installation {nstructions
 for this device will not recommend tuning the vehicle to specifications
 different from those listed by the vehicle manufacturer.

 Changes made to the design or operating conditions of the device, as
 exempted by the Air Resources Board, that adversely affect the per—
 formance of a vehicle‘s pollution control system shall invalidate
 this Executive Order.

 Marketing of this device using an identification other than that shown
 in this Executive Order or marketing of this device for an application
 other than those listed in this Executive Order shall be prohibited unless
 prior approval is obtained from the Air Resources Board.

This Executive Order does not constitute any opinion as to the effect
 that the use of this device may have on any warranty either expressed or
 implied by the vehicle manufacturer.


No claim of any kind, such as "Approved by Air Resources Board" may be made
with respect to the action taken herein in any advertising or other oral
or written communication.

"ROSCO®"                                            (Page 2 of 2)

Section 17500 of the Business and Professions Code makes untrue or mis—
leading advertising unlawful, and Section 17534 makes violation punishable
as a misdemeanor.

Section 43644 of the Health and Safety Code provides as follows:

      "43644.   (a) No person shall install, sell, offer for .sale, or
      advertise, or, except in an application to the state board for
      certification of a device, represent, any device as a motor vehicle
      pollution control device for use on any used motor vehicle unless
      that device has been certified by the state board. No person shall
      sell, offer for sale, advertise, or represent any motor vehicle
      pollution control device as a certified device which, in fact, is
      not a certified device. Any violation of this subdivision is a

Any apparent violation of the conditions of this Executive Order will be
submitted to the Attorney General of California for such action as he
deems advisable.

Executed at El Monte, California, this day
                                        7 of December, 1978.

                                       Hass, Ch'ief
                                     Vehicle Emissions Control Division

                              State of California
                              AIR RESOURCES BOARD

                                 Staff Report

                               November 27, 1978

                   Evaluation of the "ROSCO" Device in
              Accordance with Section 2222, Title 13 of the
                     California Administrative Code


      This staff report evaluates the "ROSCO" manufactured by Rosco

      Filter Air, 2666 Mark Lane, West Linn, Oregon 97068, and marketed by

      Four Star Marketing, Inc., P. 0. Box 188, Canby, Oregon 97103, for

      compliance with the requirements of Section 27156 of the California

      Motor Vehicle Code.     Starting with a brief introduction to the

      device, this report describes its operation, the benefit claims the

      applicant makes, the test data submitted by the applicant and

      concludes with recommendations to enable the Executive Officer to

      arrive at a decision.

II.   System Description

      Rosco is an in—line filter for the PCY system.     The blow—by gases

      are circulated through a pair of opposing vertically mounted stan—

      dard engine oil filters.    The filters are screwed onto a cast

      aluminum bracket, which is mounted to the body of the vehicle (See

      Figure 1).

      These filters trap the liquid from the blow—by vapors, enabling a

      relatively clean vapor mixture to enter the intake manifold.

      In vehicles where the PCY valve is not mounted on the rocker arm

      cover, the "ROSCO" can be installed upstream of the PCV valve,

      thereby helping to keep the PCV vaive clean.

               ROSC o


                *                 ToP
                            ly— o1 Anuree



                            e oicr RCTEER

                FGueg 4

      The device may be installed on all vehicles where there is an

      external PCV system.     Since the bottom filter gets filled with

      oil first, the manufacturer recommends inspection of the bottom

      filter every 3000 miles and replacement every 6000 miles.

III. System Evaluation

      The applicant submitted CVS—75 cold start emission and fuel con—

      sumption data.     Back to back tests were performed at the Automobile

      Club of Southern California.     The vehicle used was a 1978 Ford
      Thunderbird, 351 CID with the odometer reading 9939 miles at the

      start of the tests.     The outcome of the tests are summarized in

      the table given below:

                                                     Exhaust Emissions
                                                       grams per mile
                                            HC        CO         NOx         MP&
      1978 Cal. Std.                        0.41       9.0       1.5         —

           Baseline                         0. 482    22.830     1.513       8.603

           w/ROSCO                          0. 392    24.693     1.347       8.994

           percent change                 —18.7       +8.2     —11.0        +4.5

IV.   Conclusion and Recommendation

      The staff is of the opinion that the ROSCO, forming a closed loop

      with the PCV system, will have little influence on the emissions

      and the fuel economy.    The percent increase in the fuel economy and

      the CO emissions may be considered to be within the limits of test

      variations.     The high CO base line emissions could be due to the

      car being out of tune at the time of commencement of the tests.

Since the crankcase blowby gases tend to increase with the engine

wear and tear, the staff is of the opinion that the installation

of the "ROSCO" will be—more beneffcial to older vehicles.

The applicant . makes the following claims for the ROSCO.

     1.    Better Engine Efficiency

     2.    Longer Engine Life

     3.    Cleaner Engines.

Even though the applicant has not submitted test data to substantiate

these benefit claims, the staff is of the opinion that the performance

of the "ROSCO" will have insignificant/marginal contribution to these


Based on this evaluation and the evaluations of similar devices in

the past, the staff is of the opinion that the installation of the

"ROSCO" on a vehicle will not cause any additional emissions and,

therefore, recommends that an exemption be granted for the device

from the prohibitions of the Motor Vehicle Code Section 27156.
Executive Order D—86 has been prepared for the exemption of the


Document Created: 2005-09-01 12:45:11
Document Modified: 2005-09-01 12:45:11

| Previous E.O. D-85 | Next E.O. D-86-1 | Next E.O. D-87