SYNTROLEUM CORP
AMEND NO.1 TO THE SYNTROLEUM CORPORATION SECURE PROMISSORY NOTE DATED MAY 8 2002
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<DESCRIPTION>AMEND NO.1 TO THE SYNTROLEUM CORPORATION SECURE PROMISSORY NOTE DATED MAY 8 2002
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2"><B>Exhibit 10.6 </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">AMENDMENT NO. 1 </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman"
SIZE="2">to the </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">Syntroleum Corporation Secured Promissory Note </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2">Dated May 8, 2002 </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">THIS AMENDMENT (the
&#147;Amendment&#148;) is made and entered into on the 9th day of June 2004, being effective as of the 9th day of June 2004 (&#147;Effective Date&#148;), by and between MARATHON OIL COMPANY, an Ohio corporation (&#147;Lender&#148;), and SYNTROLEUM
CORPORATION, a Delaware corporation (&#147;Borrower&#148;). </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">WHEREAS, Lender
and Borrower are parties to a Syntroleum Corporation Secured Promissory Note (&#147;Note&#148;) entered into as of the 8th day of May 2002, pursuant to which Lender agreed to lend to Borrower up to $19.0 million upon the terms and conditions
contained therein; </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">WHEREAS, the parties desire to amend certain terms and
conditions of the Note as set forth herein. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">NOW THEREFORE, in consideration of
the mutual agreements contained herein and other good and valuable consideration, receipt of which is hereby acknowledged, the parties hereby agree as follows: </FONT></P> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 1. Definitions. For purposes of this Amendment, terms used herein and not otherwise defined herein shall have the meanings as set forth in the Note.
</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 2. Amendment to Section 1(k). The definition of Maturity Date set
forth in Section 1(k) is hereby deleted in its entirety and is hereby replaced with the following: &#147;Maturity Date means June 30, 2005.&#148; </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 3. Amendment to Section 4(a). Section 4(a) of the Note is hereby deleted in its entirety and replaced with the following: </FONT></P> <P
STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:4%"><FONT FACE="Times New Roman" SIZE="2">Borrower may prepay, from the Effective Date until and including the
Maturity Date, in cash, in whole or in part and without penalty, the outstanding principal balance, together with accrued interest to date of payment, of this Note upon five (5) days written notice to Lender. </FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 4. Amendment to Section 4(c). Section 4(c) is hereby deleted in its entirety.
</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 5. Amendment to Section 4(d). The language contained in the leadin
paragraph of this section, which states &#147;or has not been converted pursuant to any of the provisions contained in this Section 4 prior to the Maturity Date&#148;, is hereby deleted. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 6. Effective Date. This Amendment shall become effective on the Effective Date. </FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 7. Instrument Pursuant to Note. This Amendment is executed pursuant to the Note and
shall (unless otherwise expressly indicated herein) be construed, administered and applied in accordance with all of the terms and provisions thereof. Except as expressly amended hereby, all of the representations, warranties, terms, covenants,
conditions and other provisions of the Note shall remain unamended and shall continue in full force and effect in accordance with the provisions thereof as in existence on the date hereof. The amendment set forth herein shall be limited precisely as
provided for herein and shall not be deemed to be a waiver of, amendment of, consent to or modification of any other term or provision of the Note, or except as contemplated herein, of any term or provision of any other document contemplated
thereby. After the Effective Date, any reference to the Note shall mean the Note as amended hereby. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
FACE="Times New Roman" SIZE="2">SECTION 8. Successors and Assigns. This Amendment shall be binding upon and inure to the benefit of the parties hereto and their respective permitted successors and assigns. </FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 9. Counterparts. This Amendment may be executed by the parties hereto in any number
of counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute together one and the same agreement. </FONT></P>

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 <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 10. Governing Law. This Amendment shall be construed and enforced in accordance with the laws of the State of
Oklahoma, without regard to the conflict of law provisions thereof. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION
11. Headings. The headings of this Amendment are for the purposes of reference only and shall not limit or otherwise affect the meaning hereof. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">SECTION 12. Amendments. No waiver, amendment or other modification of any of the terms or provisions of this Amendment shall be effective without the written consent of
each party hereto. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">IN WITNESS WHEREOF, the parties hereto have executed this
Amendment by their respective officers or agents thereunto authorized. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT FACE="Times New Roman" SIZE="2">SYNTROLEUM CORPORATION</FONT></P></TD></TR>
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<TD VALIGN="top" COLSPAN="3"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT FACE="Times New Roman" SIZE="2">MARATHON OIL COMPANY</FONT></P></TD></TR>
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