Ask Smithy Xtra Kia Rio transmission oil replacement

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When I drain the automatic transmission oil of my 2006 Kia Rio only 2.5 litres drains out, but the manual states that it holds 6.1 litres. The oil level was correct before draining and car was level and oil drained after a long run so the engine was hot. Where is the other 3.6 litres of oil?

Answered by CarsGuide

7 June 2011

Graham Smith

The 2.5 litres you’ve drained is the oil that’s in the sump, the rest of the oil is in the torque converter and valve body and other parts of the transmission. The only way to remove all the oil is to flush the transmission through the cooler system. When auto trans specialists service a transmission they normally drain it as you have done and replace it with fresh oil, in so doing they freshen it up rather than completely replace it.

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