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From: Daniel W. Rouse Jr. on 8 Oct 2007 14:17 "Steve" <no(a)spam.thanks> wrote in message news:MNWdnRn0tIFp-5fanZ2dnUVZ_u2mnZ2d(a)texas.net... > N8N wrote: > > > On Oct 8, 9:11 am, "*" <nos...(a)this.addy.com> wrote: > > > >>Not only do you have Mobil-1 spelled wrong, you have the entire concept of > >>multi-viscosity oils backwards. > >> > >>When you shut your hot engine off at night, a 10w-30 oil has the viscosity > >>of a 30 weight, while in the morning, when it is cooler, it has the > >>viscosity of a 10 weight. > >> > >>Your "expert" had better stick to passing out pills and doing digital > >>rectal exams. > >> > >>He, apparently, needs a few more decades to get the multi-viscosity concept > >>correct. > > > > > > No, he just left a few words out. > > > > At operating temperature, a xW30 oil has the viscosity of a 30 weight > > oil at operating temperature. > > > > At room temperature, a 10W30 oil may very well have the viscosity of a > > 90 weight oil *at operating temperature.* The 0W30 oil may very well > > have the viscosity of a 40 weight oil *at operating temperature.* > > He's absolutely right, the nomenclature is confusing. The "10W" means > > that the oil at cold temps has the same viscosity as a straight 10 > > weight dino oil at the same cold temp. It does NOT mean that a 0W30 > > oil is thinner cold than hot. > > > > nate > > It amazes me that people have a hard time understanding this, and do > crazy things like thinking that multi-vis oils "change" thickness with > temperature. That's the whole idea- they DON'T change thickness with > temperature! When you have a hypothetical oil that flows as easily as a > COLD 10 weight oil when it is cold, but remains as thick as a HOT 50 > weight oil when it is hot, you call it a 10w50 oil. And yes, I know > that's not a common multi-vis rating (20w50 or 10w30, or even 0w30 being > more typical). I chose it deliberately to illustrate the point. > Don't these oils usually have some sort of additives (such as polymers) that cause it to thicken to the intended weight (e.g., 30 weight) at operating temperature? So based on that, 10W30 oil would be a 10 weight oil with additives, such that when the engine is at operating temperature, the additives thicken it to a 30 weight oil. Then, when the engine (and the additives) have cooled down, the oil is once again a 10 weight oil. By extension, an oil that has additive breakdown would remain its base weight (i.e., a 10W30 oil would remain mostly a 10 weight oil). NOw, using your illustrations, a 10W50 oil would be a 10 weight oil (suitable for winter use, thus the W) with additives that thicken it to a 50 weight oil at operating temperature, but if those additives break down enough, then the oil remains close to a 10 weight oil. That's how I've always understood it to work, though I don't have an actual source to cite. [snip...]
From: Jeff on 8 Oct 2007 15:03 Daniel W. Rouse Jr. wrote: <...> > Don't these oils usually have some sort of additives (such as polymers) that > cause it to thicken to the intended weight (e.g., 30 weight) at operating > temperature? So based on that, 10W30 oil would be a 10 weight oil with > additives, such that when the engine is at operating temperature, the > additives thicken it to a 30 weight oil. Then, when the engine (and the > additives) have cooled down, the oil is once again a 10 weight oil. Here is another explanation: <http://auto.howstuffworks.com/question164.htm> There are other links on that page as well. Happy reading. Jeff > By extension, an oil that has additive breakdown would remain its base > weight (i.e., a 10W30 oil would remain mostly a 10 weight oil). > > NOw, using your illustrations, a 10W50 oil would be a 10 weight oil > (suitable for winter use, thus the W) with additives that thicken it to a 50 > weight oil at operating temperature, but if those additives break down > enough, then the oil remains close to a 10 weight oil. > > That's how I've always understood it to work, though I don't have an actual > source to cite. > > [snip...] > >
From: Mark A on 8 Oct 2007 15:16 "Jeff" <kidsdoc2000(a)hotmail.com> wrote in message news:eavOi.13007$gC2.10685(a)trndny09... > Here is another explanation: > <http://auto.howstuffworks.com/question164.htm> > > There are other links on that page as well. > > Happy reading. > > Jeff That may be a reasonable explanation, but full synthetics behave quite a bit differently than conventional oil.
From: N8N on 8 Oct 2007 15:28 On Oct 8, 3:16 pm, "Mark A" <nob...(a)nowhere.com> wrote: > "Jeff" <kidsdoc2...(a)hotmail.com> wrote in message > > news:eavOi.13007$gC2.10685(a)trndny09... > > > Here is another explanation: > > <http://auto.howstuffworks.com/question164.htm> > > > There are other links on that page as well. > > > Happy reading. > > > Jeff > > That may be a reasonable explanation, but full synthetics behave quite a bit > differently than conventional oil. yes, the main difference being that the viscosity remains more stable with temperature meaning that viscosities like 0W40 or 5W50 are now practical whereas they were not with conventional dino squeezins. nate
From: Built_Well on 8 Oct 2007 15:36
I'm not certain, but I believe a synthetic 10w-30 oil and a dino 10w-30 oil are based on oils of totally different weights. The dino 10w-30 is based on a 10-weight oil. It has VIIs (viscosity index improvers) added to it to increase viscosity. But the synthetic 10w-30 oil (not conventional) is not based on a 10-weight oil like the dino, but instead based on a 30-weight. And it has what are called "pour point depressants" so that the synthetic oil flows much better than the conventional at really cold temps. A problem with VIIs (viscosity index improvers) added to conventional oils is their degradation over time, especially in cold weather. |