At R120 for oil they more than likely used something similar to cooking oil - I'll be very suspicious of whatever they put in there.
I've just had to redo my whole gearbox because I managed to "cook" it on the wasy to Moz towing a offroad caravan. - 17K later
I now only run on synthetic stuff. The normal mineral oil starts cooking at about 210 degrees C. After that the oil just gives up - the rest of the gearbox follows soon after that.
I will have to go check the exact spec's of the oil in my box but the oil alone costs almost R1000. Although I have been assured that this is now good for another 30 000 k's.
If you do not have an EMS fitted that checks the oil temperature (I've had mine modified now) I would insist on a decent oil in the gearbox.
2008 Puma 110
Dual battery system,
compressor, 29Mhz GX300, Bull Bar & Winch, Drawer system, Long range fuel tank, Water tank, Gull Wing, Snorkel and a Chobe camper for Swambo
"Money isn't everything, but pay me enough and I'll buy my own form of misery" .