I'm going to change the fluid in my Boxster S 6 speed - do it twice?

[marsheng]

Not sure but Mobil 1 is an engine oil not gearbox over here in NZ. Quite a different product. Been driving manual cars for 40 years. Never ever changed the gearbox oil in any car or ever had a gearbox or diff problem.

PS From a bearing manufacturer, if a bearing has completely clean grease, it would last for ever. Wearing comes from contaminates. Gearboxes and diffs are sealed and should therefore stay clean.

Engines are quite different. Lots of dirt from the incoming air and combustion by products, hence the need to change.

The stiffness is some other issue.

[Quadcammer]

Originally Posted by marsheng

Not sure but Mobil 1 is an engine oil not gearbox over here in NZ. Quite a different product. Been driving manual cars for 40 years. Never ever changed the gearbox oil in any car or ever had a gearbox or diff problem.

PS From a bearing manufacturer, if a bearing has completely clean grease, it would last for ever. Wearing comes from contaminates. Gearboxes and diffs are sealed and should therefore stay clean.

Engines are quite different. Lots of dirt from the incoming air and combustion by products, hence the need to change.

The stiffness is some other issue.

just totally wrong

[maytag]

Originally Posted by Quadcammer

just totally wrong

Haha, I know, right? I didn't even know where to start with that.

"Sealed for life", as it relates to drivetrain components, is self- fulfilling, Haha. NEVER, EVER trust that.

Lubricants are broken down over time by much more than simple contaminants. Shear forces are primary, as are heat and moisture.

Add to this; every single time that I have changed fluid in an otherwise "sealed for Life" component, I have discovered that the fill level is significantly lower than the factory recommendation. This must be due to fluid going somewhere. Regardless of the absence of visible leaks, weeps, or seeps.

Seriously: never trust old lubricant. Never, ever.

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