Quote:
Originally Posted by Ecky
Have you used this magic fluid in a manual transmission before?
(Snip)
Similarly, I haven't known manual gearboxes to get warm
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Yep, I've used it in dry and wet clutch applications with noticeable improvements in shift, smoothness of engagement and casing temps.
Fuel economy is usually improved around 5% in my usage, mostly repeatable sustained highway environments.
It's called Nulon G70 Manual Gearbox & Differential Additive. I won't post a link as I know that can cause dramas but the Nulon site explains its action well - the smaller .4 micron size particles help bond to the gear faces under pressure and even out surfaces which may be already worn or otherwise not surfaced optimally. The larger particle sizes stay in suspension and help the fluid interface with the oil and gears.
The main thing for gearboxes of any size in a front wheel drive application is that they are heavily restricted by the space available to them and this often are not as large as they otherwise need to be, or have interesting packaging in their design and development to help them fit.
Combined with being constrained in size they also literally run in the engine bay adjacent to the engine and so suffer heat cycles far more detrimental than traditional RWD applications.
Couple this with the fact that modern front wheel drive manuals often come "sealed for life" with no recommended fluid interval or lower drain plug and you have a recipe for disaster.
I'm planning on draining the gearbox fluid (pump required) and topping with full synthetic 75W-85 plus a dose of Nulon G70.