Originally Posted by Mad_Hatter
Originally Posted by Coastie05
Originally Posted by Snagglefoot
Here's a sheet with them both on it. There also might be some differences in base oil that a VOA can't detect.
So, I joined this site to learn because I don't have a ton of knowledge about oil, so bare with me and my question. Looking at the UOA wouldn't QSUD actually be better than PP and PUP since it has a higher viscosity number at those temps and has more moly? Also, PP and PUP don't look very different at all, so why is PUP more expensive or rated as the "higher end" oil of the two? Serious question because I don't know at all. Just looking at the numbers it doesn't make any sense to me.
You can't take one or two criterion and say "xyx is better", that's like looking at a single pixel on a TV and saying "this one's better". It's about how all the constituents perform together. A lot of criteria come into play...Type of viscosity index improvers (low quality v. high quality). The lubricants ability to resist evaporative loss. The lubricants ability to resist shear at high temps. The lubricants flow characteristics at both high and low temperature. The lubricants ability to form a sufficient film thickness and strength. Remember the purpose of additives is to aid the lubricant in preventing metal to metal contact (wear). The chemists formulating the lubricant take into consideration everything like the quality of base stocks, expected loads/temps etc. when considering how much of an additive to add. It's a balancing act and more doesn't necessarily translate to better and can even throw off the balance and have detrimental effects inside the engine. For example, anti wear additives will compete with corrosion inhibitors for metal surface area. So too much of a AW additive can actually lead to increased corrosion. The quality of the base stocks is also important. PP/PUP use GTL so in theory they're more "pure" than mineral based oils like a Grp2 or 3... Less impurities in the base stock, the better.
I am by no means the oil guru here (read: this is not my day job...‚) but this is just my take so don't take it as gospel, so if I'm off here anyone please feel free to chime in/correct.
Yes, there is more to an oil than can be ascertained from a $30 [approx] UOA or VOA. Whether we like it or not PU is still Pennzoil's Flagship PCMO. We Bitogers are unable to reverse engineer the product to see why it's better, but I would say it is pretty safe to assume the additional cost is most likely reflected in more costly ingredients used to make it. Is it worth it? To some of us it is.
Originally Posted by Coastie05
Originally Posted by Snagglefoot
Here's a sheet with them both on it. There also might be some differences in base oil that a VOA can't detect.
So, I joined this site to learn because I don't have a ton of knowledge about oil, so bare with me and my question. Looking at the UOA wouldn't QSUD actually be better than PP and PUP since it has a higher viscosity number at those temps and has more moly? Also, PP and PUP don't look very different at all, so why is PUP more expensive or rated as the "higher end" oil of the two? Serious question because I don't know at all. Just looking at the numbers it doesn't make any sense to me.
You can't take one or two criterion and say "xyx is better", that's like looking at a single pixel on a TV and saying "this one's better". It's about how all the constituents perform together. A lot of criteria come into play...Type of viscosity index improvers (low quality v. high quality). The lubricants ability to resist evaporative loss. The lubricants ability to resist shear at high temps. The lubricants flow characteristics at both high and low temperature. The lubricants ability to form a sufficient film thickness and strength. Remember the purpose of additives is to aid the lubricant in preventing metal to metal contact (wear). The chemists formulating the lubricant take into consideration everything like the quality of base stocks, expected loads/temps etc. when considering how much of an additive to add. It's a balancing act and more doesn't necessarily translate to better and can even throw off the balance and have detrimental effects inside the engine. For example, anti wear additives will compete with corrosion inhibitors for metal surface area. So too much of a AW additive can actually lead to increased corrosion. The quality of the base stocks is also important. PP/PUP use GTL so in theory they're more "pure" than mineral based oils like a Grp2 or 3... Less impurities in the base stock, the better.
I am by no means the oil guru here (read: this is not my day job...‚) but this is just my take so don't take it as gospel, so if I'm off here anyone please feel free to chime in/correct.
Yes, there is more to an oil than can be ascertained from a $30 [approx] UOA or VOA. Whether we like it or not PU is still Pennzoil's Flagship PCMO. We Bitogers are unable to reverse engineer the product to see why it's better, but I would say it is pretty safe to assume the additional cost is most likely reflected in more costly ingredients used to make it. Is it worth it? To some of us it is.
