Gear box oil replacement


Gearbox oil – between 2.5 and 3 litres.

Tools required

  • Allen key


  • If you look under the car, the gearbox is behind the engine. There’s one plug in the bottom, which you can unscrew with an allen key.
  • Be sure to have something underneath to catch the oil

  • The gearbox oil should be much clearer than engine oil you should see the difference when it is draining.
  • You should also notice a collection of swarf or bits of metal on the gearbox sump plug. This is because there is a magnet on the plug to collect bits of metal so they are not crushed between the cogs, this helps to reduce cog wear in the gearbox.

  • Then there’s a second plug at the front of the gearbox, a little way up for filling up (also allen key). Unscrew this one as well.
  • When refilling, first put in the bottom plug (of course!), then fill up through the second plug.

  • The gearbox oil filling hole is just behind the air filter (DTR use this bicycle pump device to inject the oil into the gearbox). By the way not all gearbox oil is red in colour.
  • This picture is of Redline MTL fully synthetic gearbox oil, the barchetta gearbox takes about 2.5 American Quarts of oil (the units Redline MTL is sold in)
  • The level is correct when the oil is up to the level of this plug, i.e. when the oil starts to flow out. Easiest is to use a funnel with a hose. You can insert the hose from the engine bay into the hole of the top plug…

Sounds a bit complicated, but actualy quite simple….

This technical guide was originally held at It was copied to this site in 2021 to ensure its availability and to reformat it into a more modern layout. The original guide was written by Jan Willem

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