Originally Posted by BigRich954
looking for some test info ?
is it just over price mobil car oil
It works very well, holds shift quality to 5000 miles in a high horsepower and torque shared sump inline 4-cylinder in my experience. Gets worked in the low and mid-range and roll on, and gets run up to over 10,000 RPM on occasion.
Have you searched the motorcycle used oil analysis section? I posted a specific thread about M1 10w40 4T with my test results and it's clearly in the thread title, from December of 2018.
https://www.bobistheoilguy.com/foru...1200-mobil-1-10w40-4t-racing#Post4865603
More recently I posted about M1 20W50 VTwin (shown specifically in the title) and you can compare that to the previous test which was the 4T.
https://www.bobistheoilguy.com/foru...il-1-v-twin-20w50-5065-miles#Post5183041
Both of those oils have really good boron content as well as what I consider good zinc content for flat tappet engines with cam profiles that are more aggressive than what you find in an everyday automobile.
BLS, again if zinc content is not relevant to the overall protection of an engine other than to extend an oil change interval, then there would be no addition of boron or moly or titanium, etc as anti-wear additives. Based on what is being said, the reduced zinc should be more than enough. Does anyone want to go there and say that should be the case?
I believe it is understood excessive zinc can be a negative factor. However within a certain concentration range, there are benefits that some flat tappet engines can take advantage of, and it is a fact not speculation.
The analysis posted in this thread comparing Mobil car oil to Amsoil oil... Mobil makes no car oil with that additive package and I think you said you do not know what era it came from based on posts in other threads. That test can't be considered recent or relevant when it comes to a Mobil oil comparison to any other oil, and certainly motorcycle oil that is available today for purchase and putting in a sump.
It was posted recently when boron (in the context of motor oils and the most common form used) was mentioned as an anti-wear additive that replaces zinc, that boron is not an anti-wear additive but used as an antifreeze inhibitor (!). It is in antifreeze as an inhibitor to counter the effects of antifreeze on a cooling system, which is not "inhibiting" antifreeze in motor oil.