Hi first post here so be nice. Non technical chap here. Re diff oil change curing odd handling.
I have a 2006 NC 2.0, LSD, 5 speed box 30,100 miles car purchased a year ago. At first I had been experiencing odd handling when cornering a bit like bobbling or bouncing from the back end, not severe but just not quite right. Also a vague wandering feel on the motorway. It felt skittish and nervous. No excessive noise though. I had the wheel alignment and geometry done on a Hunter set up so it was dead on, but it didn't really make a lot of difference. I lived with it right up until this week when I got my local garage to do the service. The gear oil and diff oil had never been changed. So quite overdue. I ordered the following from Opie oils. 5 litres 5w -30 synthetic, 2 x 1 Litre Mobilube 75w-90 gear oil, RED LINE Synthetic gear oil 75w-90 GL5 for the diff, and a K and N oil filter. I got the car back and got a big grin on my face. The handling has been transformed, it is like a little go cart now, it tracks around corners perfectly, it is quieter, smoother and just better overall, the engine pick up and pull is also better, so is the gear change. My guess is that the rear diff oil change cured some issue perhaps where the LSD diff was not working as well as it should? I used redline oils in an ageing series one that was very noisy in the gears and diff and it worked fantastic. Cheers. PS it is on good Yokohamas all round.