DuratecNC mystery Gearbox oil £24 for 2 litres.

Specially formulated it makes those cold changes much better, it really does work, lasts for 20,000 miles.

A 2 pack alternative is also available for £50. This contains 2 litres of detergent oil and 2 litres of our mystery gearbox oil. What you do is put pack one in and run it for 25 – 50 miles (or more if you wish) of mixed driving conditions and see if the changes get better as the synchros and gears etc are cleaned of deposits and the remainder of the old oil is dissolved, then drop it out. Fill with pack 2 (the final oil) and that’s it, job done.

Which pack should you choose? Sorry I can’t advise at the moment, the choice has to be yours based on budget, how bad you think your ‘box is and how easy it is for you to do two changes. The problem is we only have access to so many gearboxes and willing customers here so have only used pack 2 up to date and it’s worked. I think doing it with just one oil change will work too, but haven’t tried and also, there is no factual test we can do, it’s all about feel. One thing is for sure, those horrible cold changes were made 100% easier very early on in the process.

Lightweight balanced Cromo flywheel 3.5 kg £320

Fits all models of NC and noticeably improves acceleration from a standstill.

Aluminium gearchange slider blocks £25 per set of 3. A better fit than the original plastic ones and won’t break like they can on hard used track gearboxes. Can be easily fitted when the box is out.

All prices include VAT.