Brucie’s Diary: June 2012

Current mileage: 141,078

X300 Transmission Fluid Change – Third Time Lucky!

“There is a problem with most automatic transmissions in that whilst there is means of draining the gearbox it is impossible to drain the oil from the torque convertor so at best any oil change will be a partial improvement unless followed up with a further oil change.So wrote Rod Doone in ‘Sealed for Life – or not?’ which appeared in the January 2012 issue of Xclusively Jaguar News. (to be re-instated in due course).

Well, I think we can say after 3 transmission fluid changes in less than a year, Brucie’s gearbox must be just as clean as we are ever likely to get it!

The first transmission fluid change was merely, as far as I was concerned, part of an overdue service. I had noticed some oil leaking from the gearbox, but had put this down to a failed seal, and had assumed that this was just perished due to being left longer than desired. This and the second transmission fluid change are both detailed above (see June 2011 andAugust 2011)


Needless to say, the second service didn’t cure the problem, so we therefore had to assume that it was the ill-fitting electrical connector which was leaking, and this meant dropping the gearbox to access the electrical connector with a further full gearbox service to follow!

Listed below are the parts which were required to rectify the leak from the gearbox, and which provided a further change of transmission fluid as a bonus!

Part Part Number Price
Harness JLM 12337 £78.20 (+VAT)
Sump Gasket JLM 12343 £17.11 (+VAT)
Transmission Fluid Filter JLM 2128 £29.67 (+VAT)
‘O’ Ring/Seal JLM 2127 £0.32 (+VAT)
‘O’ Ring JLM 10473 £1.33 (+VAT)
Transmission Fluid (5 Litres)* C2P 10360 £26.94 (+VAT)


*Dextron Type 2 Transmission Oil
It was explained to me that where this is used, it has been superseded by successive numbers 3, 4 etc. This means that the oil meets a superior standard to the original oil specified and is safe to use in all applications where the lower number is specified.

All parts supplied by Jaguar Classic Parts and SNG Barratt (prices correct at time of publishing).