I think you just answered your own question: You know from your own data that M1 10w30 sheared down 10% in 1500 miles. This is what originally set you on a search for a more shear resistant oil. You have found one in Redline 5w30. Stick with your plan to do UOA at 3000 miles, and be sure to get the KV100 value so you can monitor if the oil has sheared. You did miss an opportunity to sample at 1500 miles to get a direct comparison with M1. Once you have your own data, then you don't have to ask other people's opinion because you will know how that oil works in your engine.
Originally Posted By: Jeffs2006EvoIX
I guess what the question is to me? is this. Is using the RL 5/30 a better choice than the M1 10/30 that the OEM recommends? Thats why I like all the opinions, reveiws and input. How do I know if the M1 shears? I do know that when I did a VOA of M1 10/30 EP that the Vis at 100C new was 10.6 when I did my first UOA on the same oil 1500 miles later, the Vis at 100C was now 9.6 so in 1500 miles is it fair to say that the M1 sheared? Or is that just normal? The lab stated "this oil sample was on par with oils with 6000 miles of use" but my oil only had 1500 miles on it? That is the original reason why I tried the RL. Its rep for not shearing. Am I wrong in making this assumption between the 2? Jeff