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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES<br> SECURITIES AND EXCHANGE COMMISSION</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington, D.C. 20549</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Pursuant to Section&nbsp;13 or 15(d)&nbsp;of the <br> Securities Exchange Act of 1934</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report (Date of earliest event reported): <b>&#160;July&nbsp;5, 2013</b></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">NuStar Energy L.P.</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of registrant as specified in its charter)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">001-16417</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">74-2956831</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other jurisdiction<br>   of incorporation)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission File Number)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer<br>   Identification No.)</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">19003 IH-10 West<br> San Antonio, Texas 78257<br>  </font></b><font size="2" style="font-size:10.0pt;">(Address of principal executive offices)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(210) 918-2000</font></b><font size="2" style="font-size:10.0pt;"><br> (Registrant&#146;s telephone number, including area code)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Not applicable</font></b><font size="2" style="font-size:10.0pt;"><br> (Former name or former address, if changed since last report.)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings 2" style="font-size:10.0pt;">&#163;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Written communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings 2" style="font-size:10.0pt;">&#163;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings 2" style="font-size:10.0pt;">&#163;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17 CFR 240.13e-4(c))</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1.01</font></b><b><font size="1" style="font-size:3.0pt;font-weight:bold;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></b><b><font size="2" style="font-size:10.0pt;font-weight:bold;">Entry into a Material Definitive Agreement.</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On July&nbsp;5, 2013, PDVSA-Petr&#243;leo S.A. (&#147;PDVSA&#148;) and NuStar Logistics, L.P. (&#147;Logistics&#148;), a wholly owned subsidiary of NuStar Energy L.P. (the &#147;Partnership&#148;), entered into an amendment (the &#147;Amendment&#148;) of that certain Crude Oil Sales Agreement dated effective as of March&nbsp;1, 2008 (the &#147;CSA Agreement&#148;).&#160; The CSA Agreement was originally entered into between PDVSA and NuStar Marketing LLC (&#147;Marketing&#148;) and was assigned to Logistics in connection with the September&nbsp;28, 2012 closing of the Asphalt JV transaction, as more particularly described in the Partnership&#146;s Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2012 and the Partnership&#146;s Current Reports on Form&nbsp;8-K filed on July&nbsp;6, 2012 and October&nbsp;4, 2012.</font></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Amendment, effective as of October 1, 2012, memorialized the reduction of the amount of crude oil purchased from PDVSA per day from seventy-five thousand (75,000) barrels per day to thirty-thousand (30,000), and the parties waived all claims related to prior delivery or purchasing shortfalls.</font></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The foregoing description of the Amendment is not complete and is qualified in its entirety by reference to the Amendment, which will be filed as an exhibit to the Partnership&#146;s Quarterly Report on Form&nbsp;10-Q for the quarter ending June&nbsp;30, 2013.&#160; In addition, the foregoing description of the CSA Agreement is qualified in its entirety by reference to the CSA Agreement, which was filed as Exhibit&nbsp;10.01 to the Partnership&#146;s Current Report on Form&nbsp;8-K filed on March&nbsp;25, 2008 and is incorporated herein by reference.</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">NUSTAR   ENERGY L.P.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt .3in;text-indent:-.3in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font><font size="1" style="font-size:3.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font><font size="2" style="font-size:10.0pt;">Riverwalk   Logistics, L.P.<br>   its general partner</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt .6in;text-indent:-.3in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font><font size="1" style="font-size:3.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font><font size="2" style="font-size:10.0pt;">NuStar GP,   LLC<br>   its general partner</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:   July&nbsp;11, 2013 </font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   Amy L. Perry</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt .45in;text-indent:-.45in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font><font size="1" style="font-size:3.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font><font size="2" style="font-size:10.0pt;">Amy L. Perry</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt .45in;text-indent:-.45in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font><font size="1" style="font-size:3.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font><font size="2" style="font-size:10.0pt;">Vice   President, Assistant General Counsel and Corporate Secretary</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_220801_5335"></a></font></p>
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
July 5, 2013
NuStar Energy L.P.
(Exact name of registrant as specified in its charter)
Delaware
001-16417
74-2956831
(State or other jurisdiction
of incorporation)
(Commission File Number)
(I.R.S. Employer
Identification No.)
19003 IH-10 West
San Antonio, Texas 78257
(Address of principal executive offices)
(210) 918-2000
(Registrant's telephone number, including area code)
Not applicable
(Former name or former address, if changed since last report.)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
£
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
£
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
£
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
£
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 1.01
Entry into a Material Definitive Agreement.
On July 5, 2013, PDVSA-Petróleo S.A. ("PDVSA") and NuStar Logistics, L.P. ("Logistics"), a wholly owned subsidiary of NuStar Energy L.P. (the "Partnership"), entered into an amendment (the "Amendment") of that certain Crude Oil Sales Agreement dated effective as of March 1, 2008 (the "CSA Agreement").  The CSA Agreement was originally entered into between PDVSA and NuStar Marketing LLC ("Marketing") and was assigned to Logistics in connection with the September 28, 2012 closing of the Asphalt JV transaction, as more particularly described in the Partnership's Annual Report on Form 10-K for the year ended December 31, 2012 and the Partnership's Current Reports on Form 8-K filed on July 6, 2012 and October 4, 2012.
The Amendment, effective as of October 1, 2012, memorialized the reduction of the amount of crude oil purchased from PDVSA per day from seventy-five thousand (75,000) barrels per day to thirty-thousand (30,000), and the parties waived all claims related to prior delivery or purchasing shortfalls.
The foregoing description of the Amendment is not complete and is qualified in its entirety by reference to the Amendment, which will be filed as an exhibit to the Partnership's Quarterly Report on Form 10-Q for the quarter ending June 30, 2013.  In addition, the foregoing description of the CSA Agreement is qualified in its entirety by reference to the CSA Agreement, which was filed as Exhibit 10.01 to the Partnership's Current Report on Form 8-K filed on March 25, 2008 and is incorporated herein by reference.
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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
NUSTAR   ENERGY L.P.
By:
Riverwalk   Logistics, L.P.
its general partner
By:
NuStar GP,   LLC
its general partner
Date:   July 11, 2013
By:
/s/   Amy L. Perry
Name:
Amy L. Perry
Title:
Vice   President, Assistant General Counsel and Corporate Secretary
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