Originally Posted By: racin4ds
Baseless?? All it takes is a simple search on here and you'll see countless posts about excessive engine noise, high iron readings in lab reports etc! I used to love M1, but in the past few years its just not the same. It makes EVERY engine I put it in noisy! I've tried it many times just to prove to myself. And don't tell me its anecdotal or not an issue, a noisy engine is not good in my book period! And when I switch to Pennzoil Ultra or Platinum the same engine magically quiets down and gets smoother!
Yes, baseless. I've torn down engines run on M1 0w-40 and they were spotless with no discernible wear. These were relatively high specific output built Ford 302's with reasonably aggressive roller camshafts.
I've also used it in numerous vehicles I've owned and observed none of the "noise" that you allude to being of epidemic proportions but really comes from a small circle of posters on here, given the membership size.
When I run out of Castrol 0w-40, I'll likely run it in my 470HP 6.4L Dodge, and if I end up trading that for a 707HP Trackhawk variant, I'll have no problem running it in that. I have confidence in the product based on actual experience with it, not silly anecdotes about noise and wild speculation about Fe numbers in UOA's.
All of the Euro 0w-40's on the market offer exceptional levels of performance as required by the certifications they carry. That's why they are used in various racing venues by OEM's, like the 24hrs of Daytona. I'll take that over wild speculation on the Internet any day of the week.