DUCK!quote:
Originally posted by GMorg:
I am amazed that this thread is still going, but I am pleased that it hasn't turned into one of those threads that remind me of monkeys throwing crap at each other. Well done guys!
DUCK!quote:
Originally posted by GMorg:
I am amazed that this thread is still going, but I am pleased that it hasn't turned into one of those threads that remind me of monkeys throwing crap at each other. Well done guys!
lol, so oil thickens when it gets hot.quote:
Originally posted by sinker73:
5W-20 and 5W-30 are both the same viscosity at room temp. They both start with the same base oil--what we designate 5W. The additives that turn it into a 20 or 30 only do so at warmer temps. The additives are little (plastic like) molecules that "unstretch" at warmer temps. When they do so, they "grab" the nearby oil molecules (which are smaller) and thus "thicken" the oil. (BTW, "shearing" is when these large molecules break and no longer "grab" the smaller oil molecules.)
At room temp, when the plastic-like molecules are not spread out, the oils from a can of 5-20 and 5-30 should run the same.
Well, although there's nothing "adaptive" in the engine, there is surely reactive components in oils that, when switching between one chemistry and another, can result in temporary consumption due to establishing new turf and kicking out the resident formations. I've had this happen myself. Not a change in viscosity ..but chemistry. It could be misinturpretted as being a viscosity depenant result ..but is most likely due to chemistry.quote:
Also, your engine doesn't get "used to" an oil.
I agree, it just gets frustrating when someone just drops into the forums and "tells us what the true information" is.quote:
Originally posted by Bryanccfshr:
I don't see it as new guys don't know as much as guys who have frquented BITOG addictevely for a long time. We often have a insider drop in and straighten us out.
We are seeing an increase in frequency of new posters who fail to gain the prerequisite knowledge to carry on an intelligent conversation concering motor oil. The knowledge is here on the forum. It takes along time to read it all and a genuine interest willl bear this. Those who fail to research or attempt to understand the material indicate a post and run philosophy. Why after 5 years on this particular format would members repeatedly have to define viscosity for example? Not that questions are not welcomed, I know I for certain look forward to intelligent discussion. I welcome new viewpoints, fresh perspectives and good ideas. We are all here to learn and or teach to further our knowledge of lubricant technology.
Why are you guys taking the time to explain basic concepts that a new member could learn on his own (if he tried)? Bottom line, an oil can be both thinner AND thicker than another oil depending on temp. W-rating has nothing to do with it, clear enough?quote:
Originally posted by Bryanccfshr:
I don't see it as new guys don't know as much as guys who have frquented BITOG addictevely for a long time. We often have a insider drop in and straighten us out.
We are seeing an increase in frequency of new posters who fail to gain the prerequisite knowledge to carry on an intelligent conversation concering motor oil. The knowledge is here on the forum. It takes along time to read it all and a genuine interest willl bear this. Those who fail to research or attempt to understand the material indicate a post and run philosophy. Why after 5 years on this particular format would members repeatedly have to define viscosity for example? Not that questions are not welcomed, I know I for certain look forward to intelligent discussion. I welcome new viewpoints, fresh perspectives and good ideas. We are all here to learn and or teach to further our knowledge of lubricant technology.
Room temp isn't where the "5W" is calibrated.quote:
Originally posted by sinker73:
5W-20 and 5W-30 are both the same viscosity at room temp. They both start with the same base oil--what we designate 5W. The additives that turn it into a 20 or 30 only do so at warmer temps. The additives are little (plastic like) molecules that "unstretch" at warmer temps. When they do so, they "grab" the nearby oil molecules (which are smaller) and thus "thicken" the oil. (BTW, "shearing" is when these large molecules break and no longer "grab" the smaller oil molecules.)
At room temp, when the plastic-like molecules are not spread out, the oils from a can of 5-20 and 5-30 should run the same.
Why are you guys taking the time to explain basic concepts that a new member could learn on his own (if he tried)? Bottom line, an oil can be both thinner AND thicker than another oil depending on temp. W-rating has nothing to do with it, clear enough? [/QB][/QUOTE]quote:
[/qb]
Excellent thread! I have known that some 5W-30s, particularly Mobil 1, are thicker than the same brand of 10W-30.quote:
Originally posted by FD777:
Blah, I didn't read the entire thread, but I think I get the gist of it.
I try to clear up some of the confusions here:
http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=51;t=000945
My thread doesn't directly address Buford's questions, but I hope it helps.