<div>Ron,</div>  <div>&nbsp;</div>  <div>Try the 20 in the OS, I bet it will be ok.</div>  <div>&nbsp;</div>  <div>It has been my personal experience that, unless the engine is over-compressed, the engine won't run any hotter with the extra nitro, in fact it may run cooler.&nbsp; This seems contrary to what most people believe, but I did find some basis for it in an old magazine article that stated nitro burns cooler (less btu output than methanol) but it expands to a much larger volume when burned.</div>  <div>&nbsp;</div>  <div>Bob R.</div>  <div><BR><BR><B><I>ron@inweldcorp.com</I></B> wrote:</div>  <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">  <META content="Microsoft Word 10 (filtered)" name=Generator>  <STYLE>  <!--  @#AOLMsgPart_3_775104bb-42a9-440a-a4f7-7bf8db94579b page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in;}     /* Font Definitions */   @font-face   {font-family:Tahoma;   panose-1:2
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 p.E-mailSignature5, li.E-mailSignature5, div.E-mailSignature5   {margin:0in;   margin-bottom:.0001pt;   font-size:12.0pt;   font-family:"Times New Roman";}  span.emailstyle172   {font-family:Arial;   color:windowtext;}  span.EmailStyle56   {font-family:Arial;   color:navy;}  @page Section1   {size:8.5in 11.0in;   margin:1.0in 1.25in 1.0in 1.25in;}  div.Section1   {page:Section1;}  -->  </STYLE>    <DIV class=Section1>  <div class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Thanks guys for all the help!&nbsp; I think I will start out with Pro-Pattern 20 and see how it goes.&nbsp; I hope to also use this in my OS46FX 2-stroke if it doesn’t run too hot (running Omega 15 now).&nbsp; Or maybe I should leave my 2-stroke fuel as is.</SPAN></FONT></div>  <DIV>  <div class=MsoAutoSig><FONT face="Times New Roman" color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy">Ron</SPAN></FONT></div></DIV></DIV></BLOCKQUOTE>