Best Motor Oil for an SC
10-05-14, 08:24 PM
#32
At 2 qts a change and given there are 14 qts in the system, 7 transmission fluid changes won't get all of it because each time you change it, you're mixing two qts partially with the previous two qts that were already added. In practice it takes between 10 and 12 changes before you've cycled through all of the previous fluid.
10 changes every 6K miles is 60K miles.
It takes me an extra 5 minutes when overlapped with the engine oil change, so it's a no brainer for me. Plus I'm hard on my transmissions.
I did the same thing on my SC400 until I sold it with 334K miles with no engine or transmission failures of any kind.
10-06-14, 11:15 AM
#33
That's your opinion, but I've 10 times as many transmission failures as engine failures. Folks way over change their engine oil and way under change their transmission fluid.
At 2 qts a change and given there are 14 qts in the system, 7 transmission fluid changes won't get all of it because each time you change it, you're mixing two qts partially with the previous two qts that were already added. In practice it takes between 10 and 12 changes before you've cycled through all of the previous fluid.
10 changes every 6K miles is 60K miles.
It takes me an extra 5 minutes when overlapped with the engine oil change, so it's a no brainer for me. Plus I'm hard on my transmissions.
I did the same thing on my SC400 until I sold it with 334K miles with no engine or transmission failures of any kind.
At 2 qts a change and given there are 14 qts in the system, 7 transmission fluid changes won't get all of it because each time you change it, you're mixing two qts partially with the previous two qts that were already added. In practice it takes between 10 and 12 changes before you've cycled through all of the previous fluid.
10 changes every 6K miles is 60K miles.
It takes me an extra 5 minutes when overlapped with the engine oil change, so it's a no brainer for me. Plus I'm hard on my transmissions.
I did the same thing on my SC400 until I sold it with 334K miles with no engine or transmission failures of any kind.
I would assume the 14 quarts is the total including the converter and you are just draining the pan of 2 quarts.
I think with this method you would never get a complete new replacement of the total 14 quarts because there is always a mixture of old and new and no way to say how much of each you are replacing each time.
Last edited by tennman117; 10-06-14 at 01:57 PM.
10-06-14, 05:42 PM
#34
I'm confused. Are you just changing 2 quarts on your drain and fill or are you changing 14 quarts.
I would assume the 14 quarts is the total including the converter and you are just draining the pan of 2 quarts.
I think with this method you would never get a complete new replacement of the total 14 quarts because there is always a mixture of old and new and no way to say how much of each you are replacing each time.
I would assume the 14 quarts is the total including the converter and you are just draining the pan of 2 quarts.
I think with this method you would never get a complete new replacement of the total 14 quarts because there is always a mixture of old and new and no way to say how much of each you are replacing each time.
2 qts, actually more like 1.8 qts per change. I do it every engine oil change. If I did a full flush instead, I'd do that about every 50K miles.
However, with auto trans fluid, it's not about how much old fluid is left but how much new fluid there is with the additives. In my opinion, a frequent drain and fill even though it's 1.8 qts is better than a full flush done every 50K miles. The fluid stays at a consistent almost but not quite new state and never gets worse.
10-06-14, 06:58 PM
#35
That is true. Zeno's paradox will keep you from ever getting all of the old fluid.
2 qts, actually more like 1.8 qts per change. I do it every engine oil change. If I did a full flush instead, I'd do that about every 50K miles.
However, with auto trans fluid, it's not about how much old fluid is left but how much new fluid there is with the additives. In my opinion, a frequent drain and fill even though it's 1.8 qts is better than a full flush done every 50K miles. The fluid stays at a consistent almost but not quite new state and never gets worse.
2 qts, actually more like 1.8 qts per change. I do it every engine oil change. If I did a full flush instead, I'd do that about every 50K miles.
However, with auto trans fluid, it's not about how much old fluid is left but how much new fluid there is with the additives. In my opinion, a frequent drain and fill even though it's 1.8 qts is better than a full flush done every 50K miles. The fluid stays at a consistent almost but not quite new state and never gets worse.
10-07-14, 05:33 AM
#36
Pit Crew
Jzwu,
So, let me see if I understand you correctly. You remove the trans pan and drain out as much of the trans oil as possible each time you change the engin oil? How often do you change the trans filter?
So, let me see if I understand you correctly. You remove the trans pan and drain out as much of the trans oil as possible each time you change the engin oil? How often do you change the trans filter?
10-07-14, 05:38 PM
#37
That said, I did pull the pan once on my SC400 at about 200K to check the filter screen which was completely clean so I never bothered again with it. I sold the car at 334K miles without ever having a trans or engine issue.
10-08-14, 09:12 PM
#39
I think the SC430 uses a screen type filter for the trans so no need to change it. You just drain and refill the fluid.
Under normal driving for most of us, the trans fluid change interval is 100k.
Under normal driving for most of us, the trans fluid change interval is 100k.
. Who's right?
10-11-14, 09:18 AM
#42
You really believe that, I have a bridge to sell you.
All newer transmissions no longer have a dip stick and you still need to change the fluid if you want your trans to last hundreds of thousands of miles. I usually put on at least 200K on my cars and some have had over 300K including my last SC400 which I sold with 334K.
The Prius also has a sealed trans (different type though) and it's PSD it notorious for failing if you go more than 100K without changing the fluid.
I think you're fine in the SC430 if you never change it if you only expect the car to last through the warranty period which the manufacturer will claim is the useful life span of the car.
If the 06+ didn't need the fluid changed, that document I posted earlier on the 06+ change procedure wouldn't exist.
All newer transmissions no longer have a dip stick and you still need to change the fluid if you want your trans to last hundreds of thousands of miles. I usually put on at least 200K on my cars and some have had over 300K including my last SC400 which I sold with 334K.
The Prius also has a sealed trans (different type though) and it's PSD it notorious for failing if you go more than 100K without changing the fluid.
I think you're fine in the SC430 if you never change it if you only expect the car to last through the warranty period which the manufacturer will claim is the useful life span of the car.
If the 06+ didn't need the fluid changed, that document I posted earlier on the 06+ change procedure wouldn't exist.
10-11-14, 01:54 PM
#43
You really believe that, I have a bridge to sell you.
All newer transmissions no longer have a dip stick and you still need to change the fluid if you want your trans to last hundreds of thousands of miles. I usually put on at least 200K on my cars and some have had over 300K including my last SC400 which I sold with 334K.
The Prius also has a sealed trans (different type though) and it's PSD it notorious for failing if you go more than 100K without changing the fluid.
I think you're fine in the SC430 if you never change it if you only expect the car to last through the warranty period which the manufacturer will claim is the useful life span of the car.
If the 06+ didn't need the fluid changed, that document I posted earlier on the 06+ change procedure wouldn't exist.
All newer transmissions no longer have a dip stick and you still need to change the fluid if you want your trans to last hundreds of thousands of miles. I usually put on at least 200K on my cars and some have had over 300K including my last SC400 which I sold with 334K.
The Prius also has a sealed trans (different type though) and it's PSD it notorious for failing if you go more than 100K without changing the fluid.
I think you're fine in the SC430 if you never change it if you only expect the car to last through the warranty period which the manufacturer will claim is the useful life span of the car.
If the 06+ didn't need the fluid changed, that document I posted earlier on the 06+ change procedure wouldn't exist.
10-11-14, 02:20 PM
#44
I am not saying you are wrong, but the pdf you reference doesn't reference the specific transmission and does not say it is generated by Lexus or Toyota. If you look at the owners manual, it says nothing about a specified transmission fluid change interval on the 06 up transmissions. Just saying!
10-11-14, 05:43 PM
#45
OK ,but once again. I went through the owners manual maintenance supplement and could find nothing about the need to ever change the transmission fluid. Just because there is a method to drain and fill published does not mean that there is a need. If you know of a Lexus document that says change the fluid on an 06 up please reference it.
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