Neutra 131 is one of the most diversed products I have ever seen that actually works.
I have customers that use it in many applications from diesel and gas, oil, transmissions, powersteering units and gearboxes.
It provides a lubricant property as well as a cleaning process, and will not dry out seals causing them to crack over time which is one of the most common problems due to cleaning processes in most fuel additives.
It softens up carbon deposits slowly, and breaks down the deposits slowly not to cause any problems with excessive chunks breaking off and possibly causing damage.
One of the things I have done to see how this stuff reacts with carbon, I took a harden'd carbon'd valve from an engines intake, let it sit overnite in the 131 with no heat, but just at room temp and came back in to find the carbon was soft. Now of course this is not going to happen in the engine like this but the point I wanted to know, would it clean it off. If left over a period of time, it would have cleaned all of it off but again, this was an extreme case of harden'd cabon deposit.
The other thing I did, was to put some 131 neutra in a white throw a way coffee cup. Let it sit and it did no damage to this cup. This tells me if it doesn't hurt this cup, then it wont hurt rubber seals in injectors and such as it had no effects on the cup. I have not tried this with any other but I'm sure there is others than can do this but how do they rate otherwise?
Again, this is where the Schaeffers products balance of additives/formulations really show off.
Toyota buys this stuff by the case loads. They use it in any car with a drivability problem as well as a maintanence issue for the used cars going out for sell on the used lot.
I just sold 3 more last night to autozone employees as they really liked how it helped their vehicles. (btw, lucas was sitting on their counter)
It all boils down to preference and of course I strongly believe in the 131 neutra as it being as diversed and inexpensive yet powerful in many ways to do jobs many that claim to do not.
I have no idea just how you'd tell a quality of a lubricant just from tech and msds' as this is only a guidline for the basic components of oil and as many of you know, we have established many times that not all facts are exposed on oils and such from the numbers seen on those sheets alone.
Obviously it is a good guide for a starting point but trying it will provide you the best proof of all.