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Major service...ish. (Done at home)
Hello Chris, the oil I used was recommended to me by a Suzuki tech and it is sold by Suzuki. I'm questioning my own memory now but I don't think there are any washers on the gearbox bungs and as they were fine we reused them. The box oil as far as I can gauge has helped on the cold mornings and I'll probably be sticking with it, the car has not yet covered fifteen thousand miles so there is every chance the box is still loosening up as the miles climb but I'm aware and accepting of the fact that these boxes are notchy by nature !
I have heard very good things about Redline MTL so it could be worth a try, I know back when I had Mk2 Golf GTI's they were known for the synchro mesh failing, partly because people simply didn't change the oil every two years and it was known to help with the crunchy cold weather changes.
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A little bit of additional info that might prove useful now I have done the brake bleed / disc check and most of the servicing (aside from gearbox and engine oil change).
If you are a bit OCD like me and want to use a torque wrench for the oil filter tightening then the following filter wrench cap from laser is the correct size for the genuine Suzuki oil filters:
* https://www.lasertools.co.uk/product/6368 (Oil Filter Wrench 68mm x 14 Flutes 3/8"D)(less than a tenner online)
On the brake bleeding I used the Sealey pressure bleeder, which although it worked OK, was not quite as straightforward as I had hoped. Main issue was even using the bleeder at close to the max pressure (around 25psi), the brake fluid was only coming out really slowly at the caliper ends. I ended up having to pump the brake pedal to move the fluid though at a decent rate which is a bit of a pain when you are by yourself!!!!
When I measured all the brake discs and pads things were in a lot better state than I had expected. Only really the front disks that might need changing in a year or so (I don't do may miles) and they still have +1mm over the minimum left on them.
Pressure bleeder still useful though as it kept reservoir filled with fluid without me having to do anything. Just wondering if anyone else has seen this with a pressure bleeder setup. I was expecting to pressurise and then just go round each caliper and drain off the fluid (i.e. no brake pumping).
I am also going to fit one of the Fumoto easy drain oil valves to make future oil changes a bit easier / quicker:
* https://www.quickvalve.co.uk/f106s_details.htm
You can attach a piece of plastic tubing to the valve for draining avoiding a lot of the mess when removing sump plug.
Finally after a bit of trawling through the online manual and some youtube vids, I got some of the grey gasket sealer that Suzuki mention in the gearbox oil change section of the ZC31 manual online. I only need a small amount for the filler and drain plugs, but ended up getting a jumbo size caulking type tube of the stuff!!!! Need to find a Permatex/Loctite equivalent instant gasket compound, but not urgent as I doubt I will change the gearbox oil for another 2 years. Not sure this stuff is strictly needed, but hey ho ;).
Some pics for reference :).
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