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Cobra R's
best oil for a performance pushrod motor?
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<blockquote data-quote="tomshep" data-source="post: 3503026" data-attributes="member: 8203"><p>Ken,</p><p></p><p>My motor is apart right now for a freshening. I was initially told by TF Racing to use 10-30. So, I ran 10-30 Mobil 1 syn. I later spoke to L&B and they told me the race teams would run thinner oil to pick up a few hp. They told me our motors were clearanced to run 20-50 dino or 15-50 syn. I then went to Mobil 1 15-50. I took the motor apart due to brass in the oil when I changed it. For the life of me, I can't find any brass showing anywhere in the motor. I can tell it blew a crank in the past and all I can figure is the oil cooler wasn't fully cleaned. The bearings look fantastic with a slight polishing on the surface. I just picked up the motor from the local machine shop last night and will be putting it together over the weekend (hopefully).</p><p></p><p>When I put it together I will start it out on 20-50 dino initially then straight to 15-50 Mobil 1 syn.</p><p></p><p>BTW, in my last order of parts from Summit I bought an oil filter cutter so I can start checking my filters. Another item I am going to start doing is oil testing from Blackstone labs. They talk about that a lot over on thedieselstop.com. It is minimal in cost and they give you a breakdown of metals, fuel, etc in the oil. Cheap insurance after seeing the components in my motor.</p><p></p><p>Tom</p></blockquote><p></p>
[QUOTE="tomshep, post: 3503026, member: 8203"] Ken, My motor is apart right now for a freshening. I was initially told by TF Racing to use 10-30. So, I ran 10-30 Mobil 1 syn. I later spoke to L&B and they told me the race teams would run thinner oil to pick up a few hp. They told me our motors were clearanced to run 20-50 dino or 15-50 syn. I then went to Mobil 1 15-50. I took the motor apart due to brass in the oil when I changed it. For the life of me, I can't find any brass showing anywhere in the motor. I can tell it blew a crank in the past and all I can figure is the oil cooler wasn't fully cleaned. The bearings look fantastic with a slight polishing on the surface. I just picked up the motor from the local machine shop last night and will be putting it together over the weekend (hopefully). When I put it together I will start it out on 20-50 dino initially then straight to 15-50 Mobil 1 syn. BTW, in my last order of parts from Summit I bought an oil filter cutter so I can start checking my filters. Another item I am going to start doing is oil testing from Blackstone labs. They talk about that a lot over on thedieselstop.com. It is minimal in cost and they give you a breakdown of metals, fuel, etc in the oil. Cheap insurance after seeing the components in my motor. Tom [/QUOTE]
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