Changed gear box oil

[Paulontour]

Finally got around to changing the gear box oil in my XC60,well not all of it. Had a clunk when going from R to D and the garage (Volvo specialist) told me not to change the oil as it may render the gearbox useless. Apparently the black oil contains bits of wear and tear and helps maintain the viscosity. Well that’s what he told me. Trawling through many forums and gearbox specialist websites, the black oil with all its debris appears to be correct although it’s only a small percent of gearboxes that fail after a flush.
So rather than a full flush I drained the sump of 3 1/2ltrs of black oil, filled with 3 1/2ltrs of new oil. Ran it for a couple of minutes in R and D. Drained and refilled again but this time adding half litre of Lucas transmission fix. The result is amazing. Smooth gear shifts, no clunking from R to D.
I don’t think my gearbox was breaking down like the garage said. There was no bits of debris in the oil. The oil was just like black water. Any way the oil now is a dark cherry colour. I’ll do it again in a couple of months and keep on top of it. Very happy with the result.