Originally Posted by MrMoose

It's mostly internet scaremongering. Mobil1 0W-40 is SN+ & SP rated, that means it's passed the latest LSPI testing. Porsche also used (uses?) it as factory fill and it's one of their A40 listed oils. The cognitive dissonance between "Porsche has amazing engineering and makes the best cars" and "these cars will explode if you even wave the wrong bottle of oil near them and also Porsche uses and recommends crappy oil" on this forum is mind-boggling sometimes.



And yet there's no evidence that that makes any significant difference in wear. It's a great example of people playing in the nose of the data: the wear numbers or some other value fluctuates a bit and people convince themselves it's significant. Why is being slightly low on the arbitrary line between 40wt and 30wt an issue? Why 40wt particularly then? If more viscosity is better, shouldn't you be running 50wt?

I mean, you've literally got Blackstone telling people that they've never seen any significant difference between brands, and yet people insist on using their UOA numbers to try to convince themselves they need some magic motor oil which is almost certainly made by one of the major companies anyway. But, hey, what does Blackstone know? They've only got thousands and thousands of data points, right?

https://www.blackstone-labs.com/which-oil-to-use/

"The only difference between these products and the major company brands is the name on the container and the price. Don’t believe us? Try running your own experiment: do a sample on Oil A after a known number of miles, then do a sample on Oil B and compare the wear levels. You may see a little fluctuation, but it’s very rare for one oil to make a significant difference in an engine’s wear patterns. "

Originally Posted by workhurts

Btw Walmart has a three pack of 5q deal for $63 going on now (no rebate or anything).

Originally Posted by Carrera2RS

I am thinking of 10W50 Millers CFS NT+, Hartech use this and looking at the reviews seems it offers good protection and I do find the mechanical noise can be higher than I might like when the engine is hot (tickover) and moving to improved viscosity at 100 deg C, might help ?

Originally Posted by Petza914

Personally, I like a 5 cold viscosity rating for these engines. Flows well when cold and provides a bit more film strength protection on initial startup. 10 is getting a little thick for the tight tolerances in these on cold start in cold conditions. The 50 when hot is good though and why I run the Driven FR50 5w50 in mine.

For those with m2s, the Driven DI40 is actually a 5w40 and being rebranded as such. It was always borderline between a 0 and 5 when cold and the original bottles and press releases called it a 5w40, then it was relabelled as a 0w40, but is now being relabeled again as 5w40 so don't worry about that being too thin when cold as it's fine and what I run in my DFI Cayenne Turbo S and my DFI Audi Q5.

Originally Posted by Carrera2RS

Looks like Driven DI is not available across the pond, this might be a contender ? https://pim.liqui-moly.de/pdf/en_GB/liqui/21/P000348

Originally Posted by Petza914

It's not actually. I can look at a UOA report after 3-5k miles of use and tell you which of 4 or 5 used in the 997s it is based on metal wear, zinc and Phosphorous levels, and viscosity. M1 and LM (other than Molygen) show higher bearing wear numbers than Driven or Motul. M1 shows low viscosity and higher aluminum wear than the others.

If the object of an oil is to reduce metal wear then the oils that show the lowest metal ppm are the best oils. If you don't care about your engine wearing out internally or don tkeep your cars for a long time, then you're right, they're all "good enough".