Fil, this is not an additive, the picture is of a 1ltr bottle of gearoil. There should be at least 2 on your invoice.

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

Thanks Tony for the oil list, ill see if i can get any of them here in Australia.
The oil looks to be coming from on top, they unbolted the gear lever when removing the box like in your description ( i printed it out for them), could it be a loose bolt/s on the gearstick flange.
Peter

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2002 KJ 2.5Lt CRD minor mods sofar.
My own design air/fuel filter setup.
2" spring lift, Snorkel, Rooftop camping setup.
And some mods of thermostat and fan shroud.
More to come as need arises.