Automotive vs. Motorcycle oils
#21
Oh, and the only reason I spend any time at all on oil threads is that not enough people are informed as to the actual science of Tribology. These threads tend to be more like a religious discussion, with opinions held dearly, and any information to the contrary to be regarded with disdain, or simply ignored.
#22
Every now and then you run into a civil discussion where good info is posted. "I use brand X and it never fails" isn't very useful. "I use brand Y because of what it contains, because this is my application, and here's my UOA" gets my attention. My goal it to get my cars to 200k miles. That's when I usually dump them. I am very tough my cars. I've had 2 that lived on the cheap stuff from Walmart. For bikes I'm looking for an oil that can take the type of abuse a particular bike will get. Name brand "Z" may be the greatest stuff on earth, but I don't need it for my applications. I'd rather do multiple low cost oil changes than 1 high price oil change for the same mileage interval. In the end its your money and your motor. Do your research and come up with a plan... no one will agree with it.
#23
I disagree, because I agree with your plan!
Staying within designed viscosity ranges is pretty important with combo engine/transmission systems. And, MOST oils lose viscosity very, very quickly (relatively speaking)...even the expensive ones. UOA's don't lie.
Staying within designed viscosity ranges is pretty important with combo engine/transmission systems. And, MOST oils lose viscosity very, very quickly (relatively speaking)...even the expensive ones. UOA's don't lie.
#24
viscosity loss quickly yes, but there also this thing called oxidative thickening of oil exposed to high temps.
so an oil oil that was flagged as being below grade in a UOA sample (then blasted on the net) could have come back as "in grade" if the oil was left in the motor another period of time (then praised on the net),
Point being the chemist play a fine line in balancing breakdown and shear against thickening in modern oils. Waayy more consideration than posters to oil forums even begin to understand. I'm an old member of NORIA and took interest in the stuff for years, came to conclusion the more I learned about oil formulation the less I knew and the more I trusted the guys who formulate it.
so an oil oil that was flagged as being below grade in a UOA sample (then blasted on the net) could have come back as "in grade" if the oil was left in the motor another period of time (then praised on the net),
Point being the chemist play a fine line in balancing breakdown and shear against thickening in modern oils. Waayy more consideration than posters to oil forums even begin to understand. I'm an old member of NORIA and took interest in the stuff for years, came to conclusion the more I learned about oil formulation the less I knew and the more I trusted the guys who formulate it.
Last edited by RimBender; 10-23-2012 at 02:58 AM.
#26
viscosity loss quickly yes, but there also this thing called oxidative thickening of oil exposed to high temps.
so an oil oil that was flagged as being below grade in a UOA sample (then blasted on the net) could have come back as "in grade" if the oil was left in the motor another period of time (then praised on the net),
so an oil oil that was flagged as being below grade in a UOA sample (then blasted on the net) could have come back as "in grade" if the oil was left in the motor another period of time (then praised on the net),
Tribology really is a science. There isn't a need to rely upon so much conjecture, guessing, and going by uniformed opinions.
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