Is Mobil 1 0w-40 too thin?

[scrllock]

Castrol Euro 5w40 held up longer than m1 0w40 in the Audi 3.0t sc. The 1.4tsi took 5w40 as well. The 2.0t looks to fit right in the middle of the VW line up lol, you see a pattern here? The 5w40 will do well to absorb the turbo heat, viscosity is king, just change it every 4-5k. Oil pressure should be better too.
Also, I could have swore there was an article about how vw504 oil, which is very good oil, does not do well with ethanol. With Europe not mixing ethanol in their gasoline/petrol like we do. Anyone else confirm or deny? But right now the jetta has valvoline xl-iii euro 5w30 in the 1.4tsi, it's vw504 and came with 2 car washes at the express lube. Will have an oil analysis in a few months, 250,000km coming up.

the only thing is that 504 is low-mid saps, so lower TBN to handle acid byproducts from ethanol combustion. nothing inherently bad about using ethanol, many 504 lubes are API SN/SP which has tests for e85. i would change oil earlier if using ethanol, but this isn't specific to 504.

 

[edyvw]

the only thing is that 504 is low-mid saps, so lower TBN to handle acid byproducts from ethanol combustion. nothing inherently bad about using ethanol, many 504 lubes are API SN/SP which has tests for e85. i would change oil earlier if using ethanol, but this isn't specific to 504.

Not necessarily. Amsoil 5W30 AEL (VW504.00) has TBN almost 9, which is in line with full-SAPS oils. The question is are additives ash ones or ashless.

 

[altaylar]

Thus the move to 40 grade. Perhaps you missed that part. Then again the motor is tune only. I guess that tune allows more fuel past the rings...

https://upload.wikimedia.org/wikipedia/commons/6/63/Vapor_ethanol_mixtures_Fig_4.3.jpg


It would take longer to get up to temperature? I didn't recall grade being a measure of specific heat.

If you think about the change in temperature being a function of hest intake divided by spesific heat, and heat intake as a function of some friction coefficient and distance traveled by the oil it will make sense. We could say that thicker oil should have more carbon per molecule, but first i do not know how that effects the spesific hest either, second there are various sort of base oils that this would be an oversimplification. But thicker oil flows slower all things equal, especially when cold.