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Old 13th May 2010, 13:36   #1
Sipnogard
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Default Auto box oil change

I have read that it important to get the oil to the correct temperature when changing the oil in an automatic gear box.

How do I check the oil temp?

Do I need to connect it to a diagnostic system or is there another way?

Also does anyone know where the cheapest place to buy the oil is currently?
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Old 13th May 2010, 14:11   #2
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Default Auto Oil

The fluid (JF403E) is available from Rimmer Bros for under £30 for 5 litres
but postage will bump that up considerably. The temperature is important when checking the level after the refill. I personally drove for about ten miles and then checked the level and have had no problems since. The box holds eight litres of the fluid but you can only drain 4 litres so some members do a change, drive for a while and then drain again. That way you will have changed 75% of the old stuff. The change is due every
60,000 miles or every 4 years.
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Old 13th May 2010, 16:03   #3
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You can stand the bottle in a bucket of hot water. 50º is only hand hot. Once the engine is running and you are passing through the gears 10 seconds each one it will very quickly get up to temperature. Then check level.
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Old 13th May 2010, 16:09   #4
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Quote:
Originally Posted by wuzerk View Post
The box holds eight litres of the fluid but you can only drain 4 litres so some members do a change, drive for a while and then drain again. That way you will have changed 75% of the old stuff. The change is due every
60,000 miles or every 4 years.
Is it possible to get a tube in to siphon more out?
The car had done 76,000 and is 8 years old with nothing in the service book to say it has been done.

Does it cause problems if the oil gets too hot or is this not really possible?
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Old 13th May 2010, 17:00   #5
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This is how i did!

1 First drain the oil and measure the amount that comes out.
2 Refill with the same amount that has been drained.
3 Drive the car for a while.
4 Repeat 1-3 3 times. Now you have replaced about 90 % of the oil.
5 Open the level plug and let the oil drain into a container with a thermometer and wait until the temperature of the drained oil is 40 degrees C
6 When the oil has stopped running and the temp is 40-45 degrees, close the level plug.

Hope you have use of this.
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Old 13th May 2010, 20:24   #6
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Measuring the oil temperature is a bit extreme. Analysis paralysis!
Maybe we should just sit and think a bit as well.
I have read the piece, but I must say that it does not make a lot of sense to prescribe such accuracy, such limited temperature differences.
If you look at the thermal expansion of oil it is minimal within these temperatures eg. at 20 degrees 0.893 and at 40 degrees 0.881 g/ml. In plain english, this means that the oil has expanded by less than 1.4% with an increase of 20 degrees. Say 8 liters of oil in the box, and 1.4 % is 112ml, or, for each degree you are out, you have an error of 5.6ml.
Utter nonsense, even if it is an official Rover publication.
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Old 14th May 2010, 20:56   #7
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I agree with Kaiser.I measured the amount drained,which looked and smelled awful,and replaced it with the same amount.Did'nt preheat ATF,and the box is perfect since.It's up to everybody the lengths they go to,but from my experience the process is exaggerated.
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Old 17th May 2010, 13:45   #8
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Quote:
Originally Posted by pat hanley View Post
I agree with Kaiser.I measured the amount drained,which looked and smelled awful,and replaced it with the same amount.Did'nt preheat ATF,and the box is perfect since.It's up to everybody the lengths they go to,but from my experience the process is exaggerated.
Thanks for the input, I was thinking along the same kind of lines but not having a lot of technical expertise thought it best to check.
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Old 17th May 2010, 13:56   #9
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I was hesitant about doing the ATF change after reading about the importance of temp.etc.but after getting ridiculous quotes from garages who knew less than me about 75's,I decided to do it myself.With help from here and the Haynes Manual it went straight forward.
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