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It's been in a heated shop for 1 1/2 yrs.</a></h3> </div><div id="BVQAQuestionMain105876" class="BVQAQuestionMain"><div id="BVQAQuestion105876" class="BVQAContent BVQAQuestion"><div class="BVQAContentText BVQAQuestionDetails"></div><div class="BVQAContentData BVQAQuestionData"> <div class="BVQAElapsedTime">4 months, 1 week ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Question_Display_ReadAllQA_wolf" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/mixlqcfbbxkamogq8fpo18kr4/profile.htm" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_ennc2o3evnfk5rgwrfdnnnqkx_ID', 'http://answers.grainger.com/answers/5049-en_us/mixlqcfbbxkamogq8fpo18kr4/profilesnapshot.djs?format=embeddedhtml', 'ProfileSnapshotFrame' ,500, 500 ) && BVAnalyticsTracker.fireActionEvent(this); ">wolf</a></div><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Question_Display_ReadAllQA_wolf" class="BVQAUserProfile" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/mixlqcfbbxkamogq8fpo18kr4/profile.htm" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_ennc2o3evnfk5rgwrfdnnnqkx_ID', 'http://answers.grainger.com/answers/5049-en_us/mixlqcfbbxkamogq8fpo18kr4/profilesnapshot.djs?format=embeddedhtml', 'ProfileSnapshotFrame' ,500, 500 ) && BVAnalyticsTracker.fireActionEvent(this); "> <img src="http://grainger.ugc.bazaarvoice.com/answers/5049-en_us/static/moreQuestionsAndAnswers.gif" alt="Read all my Q&A"/></a><div class="BVDI_PSSpacer"> </div><div class="BVDI_PS BVDI_PSPopin BVDIHidden BVDI_PSNotLoaded BVQA_PSPopin" id="BVDI_PSMetaData_ennc2o3evnfk5rgwrfdnnnqkx_ID" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_ennc2o3evnfk5rgwrfdnnnqkx_ID', 'http://answers.grainger.com/answers/5049-en_us/mixlqcfbbxkamogq8fpo18kr4/profilesnapshot.djs?format=embeddedhtml','ProfileSnapshotFrame',500,500) &&BVAnalyticsTracker.fireActionEvent(this);" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000,250);"><div class="BVDI_PSInside"><div class="BVDI_PSSnapshotContainer BVQA_PS_mixlqcfbbxkamogq8fpo18kr4_Container"><div class="BVDI_PSSnapshotNotLoaded" style="display: none"> </div><div class="BVDI_PSSnapshotLoading"><img src="http://grainger.ugc.bazaarvoice.com/answers/5049-en_us/static/profileSnapshotLoading.gif" alt="Please wait while more information about wolf is loaded." title="Please wait while more information about wolf is loaded."/></div><div class="BVDI_PSSnapshotTimeoutError BVDIHidden">Additional information about wolf could not be loaded. </div></div></div></div></div><div class="BVQAAnswerQuestion"><a title="Answer this question" data-bvcfg="__CONFIGKEY__" data-bvjsref="http://answers.grainger.com/answers/5049-en_us/product/6MGJ9/question/105876/answerquestion.djs?format=embeddedhtml&campaignid=BV_QA_BROWSE&sessionparams=__BVSESSIONPARAMS__&return=__RETURN__&innerreturn=http%3A%2F%2Fanswers.grainger.com%2Fanswers%2F5049-en_us%2Fproduct%2F6MGJ9%2Fquestions.djs%3Fformat%3Dembeddedhtml%26expandquestion%3D105876&user=__USERID__&authsourcetype=__AUTHTYPE__&submissionparams=__BVSUBMISSIONPARAMETERS__&submissionurl=__BVSUBMISSIONURL__" name="BV_TrackingTag_Question_Display_AnswerThisQ_105876" onclick="bvShowContentOnReturnQA('5049-en_us', '6MGJ9', 'BVQAQuestion105876');return typeof(BVQAOnSubmit)=='function' ? 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title="Grainger Employee" id="BVDI_BABadge_9j9j0mkn3rtz063x8kwk70v1r_ID"> <span class="BVDILinkSpan">Grainger Employee</span></a></li></ul></div></div></div><div class="BVQAContentText BVQAAnswerText"><div class="BVQAContentLabel BVQAAnswerLabel">Answer: </div>The vendor has supplied the following information:<br /><br />Storage requirements:<br />DEF should be stored in a cool, dry, well-ventilated area, out of direct sunlight. While the optimum storage temperature is up to 77 deg F (25 deg C), temporary exposure to higher temperatures has little to no impact on the quality of DEF.<br /><br />Shelf life of DEF:<br />The shelf life of DEF is a function of ambient storage temperature. DEF will degrade over time depending on temperature and exposure to sun light. Expectations for shelf life as defined by ISO Spec 22241-3 are the minimum expectations for shelf life when stored at constant temperatures. If stored between 10 and 90 deg F, shelf life will easily be one year. If the maximum temperature does not exceed approximately 75 deg F for an extended period of time, the shelf life will be two years.</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">4 months, 1 week ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_AngieO" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/XAXO012/profile.htm" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_iu779xwu75373atu5i5tq1gt9_ID', 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