WingZeroX5 Colonel Rep 682 Posts 2,310



Join Date: Mar 2010 Location: New Hampshire

14) iTrader: (

Drives: F80 / F30

Quote: Originally Posted by kawasaki00 Quote: aussiem3 Originally Posted by So, will running a thinner oil like 5w-30 help this issue ... if clearance is the main culprit here?

As far as the oil consumption the "weight" of the oil has nothing to do with it. Different brands and additive packages will contribute to this but if a company as Castrol made a 5-40 with the same package as 10-60 consumption would be no different and in many cases it can actually improve. Certain street car oils are known to have lots of consumption. Quaker State full synthetic is one of them. That is because of the additive package though not because of the weight.

People will argue all day long about oil and what is best because the manufacture says so but the bottom line is a thinner oil with the proper additive package will help the clearance problem. The tws oil is pretty much a diesel oil additive package. I have tested it along with many other oils in our shop with a 250k machine and the conclusion is that the tws has virtually the same additive package as a Delvac or Rotella diesel oil.

So what do I run, I am sure a lot of people will disagree but I run Rotella 5-40 because of the known bearing problem. If this problem did not exist I would run the 10-60 just as it calls for. Is it a fix, no. Will it help, yes it will. .001 rod clearance is entirely too tight on a street engine that was made to run 10-60. The thinner the oil the tighter you can run the clearance.As far as the oil consumption the "weight" of the oil has nothing to do with it. Different brands and additive packages will contribute to this but if a company as Castrol made a 5-40 with the same package as 10-60 consumption would be no different and in many cases it can actually improve. Certain street car oils are known to have lots of consumption. Quaker State full synthetic is one of them. That is because of the additive package though not because of the weight.People will argue all day long about oil and what is best because the manufacture says so but the bottom line is a thinner oil with the proper additive package will help the clearance problem. The tws oil is pretty much a diesel oil additive package. I have tested it along with many other oils in our shop with a 250k machine and the conclusion is that the tws has virtually the same additive package as a Delvac or Rotella diesel oil.So what do I run, I am sure a lot of people will disagree but I run Rotella 5-40 because of the known bearing problem. If this problem did not exist I would run the 10-60 just as it calls for. U run the t6 in your m3?? Cool!