Just drained to refill with new ATF and I am sure what has come out in Engine oil. ....Yes I got the correct plug.... Clean and no ATF smell to it. Box was ok, car new to me so slowly changing all the fluids. Did I read somewhere fully synth engine oil is good in the T5 ?
•Gearbox & Final Drive Differential; T5 Borg Warner/Tremec Gearbox Fluid 1.4 litre ATFQ3; Diff with Hydratrak Fluid 1.7 litre EPW80-140 Dont know if this helps from Graham varley pages