00279-1qt5w-01 synthetic?
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From: Jeff Strickland on 20 Sep 2007 11:10 "Jeff" <kidsdoc2000(a)hotmail.com> wrote in message news:fRjIi.7830$A72.264(a)trnddc08... > Jeff Strickland wrote: >> Use the oil that is called for in the Owner's Manual. Synthetic costs >> more, and there is a camp that will claim that it is superior to dino >> oil. (I will not be drawn into that debate.) >> >> Toyota, and others, are now recommending light weight oils because they >> take less effort to pump through the motor, freeing up energy to deliver >> to the tires instead. If you were to use a straight 30 weight oil (30W), >> then in cold weather -- early morning -- the engine would have to puch >> thick goo through the motor. This makes a lubrication issue to deal with, >> and it takes fuel. So, if you used 0w30, then in cold, the 0 in the oil >> means it is thin and easy to pump, but as it warms up it gets thicker so >> it protects better. > > The oil gets thicker as it gets warm? > > > Single weight oil is kind of like pancake >> syrup; as it heats up, it thins out so you need to plan your selection >> for the heat and suffer with the effects when it is cold. Multi weight >> (multi grade) oil is kind of the opposite, it is thin when cold and gets >> thick with heat. > > No, that's not true. When oil gets warmer, it gets thinner. However, > multivisocity oil behaves like thinner oil at low temperatures (e.g., 5w30 > oil flows more easily than 30 oil at 0 F), but like thicker oil at higher > temperatures (e.g., 5W30 oil is thicker at 200 F than 0 oil). > Which is what I said, but differently. I was trying to keep the discussion in layman's terms and avoid the science of viscosity and the actual behavior. It (multi viscosity oil) behaves like thin oil -- the low number -- when cold, and like thick oil -- the high number -- when warm. Perhaps "behaves" is the worng word, "protects" would be better. Either way, the analogy works to draw a mental picture of what the numbers mean as a practical matter, if the analogy falls short of what happens in the real world. > This pages does indicate how the multiweight oil does thin at higher > temperatures, but not as much as singleweight oil. > > http://auto.howstuffworks.com/question164.htm > > <...> Thanks for the link ...
From: Jeff on 20 Sep 2007 20:17 Jeff Strickland wrote: > > "Jeff" <kidsdoc2000(a)hotmail.com> wrote in message > news:fRjIi.7830$A72.264(a)trnddc08... >> Jeff Strickland wrote: >>> Use the oil that is called for in the Owner's Manual. Synthetic costs >>> more, and there is a camp that will claim that it is superior to dino >>> oil. (I will not be drawn into that debate.) >>> >>> Toyota, and others, are now recommending light weight oils because >>> they take less effort to pump through the motor, freeing up energy to >>> deliver to the tires instead. If you were to use a straight 30 weight >>> oil (30W), then in cold weather -- early morning -- the engine would >>> have to puch thick goo through the motor. This makes a lubrication >>> issue to deal with, and it takes fuel. So, if you used 0w30, then in >>> cold, the 0 in the oil means it is thin and easy to pump, but as it >>> warms up it gets thicker so it protects better. >> >> The oil gets thicker as it gets warm? >> >> > Single weight oil is kind of like pancake >>> syrup; as it heats up, it thins out so you need to plan your >>> selection for the heat and suffer with the effects when it is cold. >>> Multi weight (multi grade) oil is kind of the opposite, it is thin >>> when cold and gets thick with heat. >> >> No, that's not true. When oil gets warmer, it gets thinner. However, >> multivisocity oil behaves like thinner oil at low temperatures (e.g., >> 5w30 oil flows more easily than 30 oil at 0 F), but like thicker oil >> at higher temperatures (e.g., 5W30 oil is thicker at 200 F than 0 oil). >> > > Which is what I said, but differently. I was trying to keep the > discussion in layman's terms and avoid the science of viscosity and the > actual behavior. It (multi viscosity oil) behaves like thin oil -- the > low number -- when cold, and like thick oil -- the high number -- when > warm. Perhaps "behaves" is the worng word, "protects" would be better. > Either way, the analogy works to draw a mental picture of what the > numbers mean as a practical matter, if the analogy falls short of what > happens in the real world. Got you. It was a bit confusing the way you worded it. Thanks for the clarification. Jeff
From: Dave C. on 22 Sep 2007 22:25 "Jeff" <kidsdoc2000(a)hotmail.com> wrote in message news:U4EIi.5156$fz2.2486(a)trndny03... > Jeff Strickland wrote: >> >> Which is what I said, but differently. I was trying to keep the >> discussion in layman's terms and avoid the science of viscosity and the >> actual behavior. It (multi viscosity oil) behaves like thin oil -- the >> low number -- when cold, and like thick oil -- the high number -- when >> warm. Perhaps "behaves" is the worng word, "protects" would be better. >> Either way, the analogy works to draw a mental picture of what the >> numbers mean as a practical matter, if the analogy falls short of what >> happens in the real world. > > Got you. It was a bit confusing the way you worded it. > > Thanks for the clarification. > > Jeff I always felt another way to look at it is that the multi viscosity oil (say, 5w30) gets 'less thick' at cold temperature and 'less thin' at high or operating temperature compared to single viscosity oil (maybe 20w). I never thought it acts 'exactly' like 5w at cold temperature and 'exactly' as 30 weight at high temperature. Does this generalization sound reasonably correct? Dave C.
From: johngdole on 22 Sep 2007 23:12 Well, you're not the only person with bad experience at the Toyota service department. They seem to be the worst in town. Just follow the messages in this and other Toyota groups. If Toyota designed the Prius with synthetics in mind, then the service interval would have been 12000-15000 miles. Actually dino oil CAN last up to 12000 miles in GM and Honda cars with oil sensors. That said, in 2004 Toyota reduced the oil service interval from 7500 miles down to 5000 because of sludge concerns with their engines. So that may be the reason the synthetics were introduced as some said it's the only way against sludge in these engines. Now how do you know if the high school kid working the part time oil change job in the back didn't just looked at the oil chart on the wall and put dino oil in there? That's what I want to know. On Sep 19, 3:51 am, "Rocky" <jcadellano.s...(a)optonline.net> wrote: > I checked the manual last night - no mention of synthetic. Why do they let > these morons work at the service desk? He said I could not use the dealer's > discount oil change coupon next time because it does not cover synthetic oil > but the car does not use syn. > > The service manager was supposed to call me yesterday but never did. If I > give them a lower mark service postcard, what happens to them? I have the > survey from the other Toyota dealer I bought the car from and I can't answer > excellant on that either since I was treated rudely by their service writer > too.
From: Mark A on 22 Sep 2007 23:20
<johngdole(a)hotmail.com> wrote in message news:1190517129.230716.149800(a)w3g2000hsg.googlegroups.com... > Well, you're not the only person with bad experience at the Toyota > service department. They seem to be the worst in town. Just follow the > messages in this and other Toyota groups. > > If Toyota designed the Prius with synthetics in mind, then the service > interval would have been 12000-15000 miles. Actually dino oil CAN last > up to 12000 miles in GM and Honda cars with oil sensors. > > That said, in 2004 Toyota reduced the oil service interval from 7500 > miles down to 5000 because of sludge concerns with their engines. So > that may be the reason the synthetics were introduced as some said > it's the only way against sludge in these engines. > > Now how do you know if the high school kid working the part time oil > change job in the back didn't just looked at the oil chart on the wall > and put dino oil in there? That's what I want to know. I never have someone change my oil unless I can see them do it. You are absolutely correct to be concerned, regardless of whether it is a Toyota dealer. |