The after effect of the tranny oil change.

[Brucelee]

Most gear lube smells really awful. I believe it is sulphur.

[MNBoxster]

Originally Posted by Brucelee

Most gear lube smells really awful. I believe it is sulphur.

Hi,

Yes, you're right. Gear Lube needs to be much more resistant to compression than Motor Oil does. Basically, so it can withstand the extreme pressures experienced between the gears as they mesh (much higher than anywhere in the engine).

To meet this need, the lube manufacturers use an additive which is a sulphur/phospohorus compound. It is already present in refined Oil (as well as part of the additive pkg.), but added to Synthetic Oil.

As the Gear Oil ages, it becomes less stable and it's chemistry changes. These additive compounds breakdown releasing the Sulphur and that's what you smell. It also means that the Lube has lost some of it's ability to resist compression too...

Happy Motoring!... Jim'99

[CJ_Boxster]

Originally Posted by Brucelee

Most gear lube smells really awful. I believe it is sulphur.

Could have fooled me, i thought my gear oil in my other cars was fused with cat piss and burnt cat hair.

[Adam]

The fuel filter doesn't need to changed in later model boxsters so says my bentley book....less maintence makes me a happy guy I'ts amazing they now have a lifetime fuel filter??

[MNBoxster]

Originally Posted by Adam

The fuel filter doesn't need to changed in later model boxsters so says my bentley book....less maintence makes me a happy guy

Hi,

Yes it will, just not as a maintenance item, but eventually, it will clog. It'll take at least twice as long as the earlier models because your fuel system is of the Non-Return type. It distributes only that fuel which the DME/Injectors call for.

The earlier cars sent fuel to the fuel rail and that which wasn't used was returned to the tank via the return line, so much of the fuel actually went through the fuel filter two or more times before being burned.

You don't have the maintenance, but the downside is that when it fails (or the fuel pump for that matter) the whole unit - Filter, Fuel Pump and Fuel Sender must be replaced because it's all one integrated unit. If any one of the three fails, you replace them all. Easier, but far more expensive in the long run. Still doesn't mean you can't be happy...

Happy Motoring!... Jim'99

[RandallNeighbour]

Blink, my mechanic said that I should not make any instant opinions about the new tranny oil in my car during the first hundred miles after changing it. He said there are some chemical reactions going on when the transmission gear oil gets hot and it actually gets better after a couple of weeks. Something about the stuff in the synthetic mixture adhering to the parts and making them work better after a little driving time.

I haven't driven my car enough to notice this or not yet. 1-2 does seem easier when cold though.

Originally Posted by RandallNeighbour

Blink, my mechanic said that I should not make any instant opinions about the new tranny oil in my car during the first hundred miles after changing it. He said there are some chemical reactions going on when the transmission gear oil gets hot and it actually gets better after a couple of weeks. Something about the stuff in the synthetic mixture adhering to the parts and making them work better after a little driving time.

I haven't driven my car enough to notice this or not yet. 1-2 does seem easier when cold though.

Randall, did Hans recommend that you use the Royal Purple when you did the tranny change, or was this your choice?

[RandallNeighbour]

He did suggest Royal Purple. I think he doesn't know about Red Line though...