Mitsubishi Problems

It's unlikely. I think the explanation that your foot slipped off the brake pedal and on to the accelerator is more likely to be the real cause of your crash.

Consult an expert in the field to get an independent opinion and   then submit a full report expressing your disappointment with the   company, that rust is unacceptable in a car in this day and age and   that you believed Mitsubishi was a better corporate citizen than it   appears to be. For an expert try Graeme Cuthbert on 0422 444 335.

You're right, a seal is meant to seal, not leak. My guess is that if is a weep and not a full blown leak the dealer will want to continue to "monitor" it, whatever they might mean by that. I would get on the front foot with them and demand that it be fixed, it is only likely to get worse and probably leave you with the bill to fix it after the warranty has expired. Get it fixed now and should be no further concern about it.

No, it is not normal, and something is going wrong to make it happen. You should report it to your dealer and request that it's investigated and fixed.

It sounds like it is going into limp-home mode for some reason, and by turning the engine off and re-starting you are resetting the computer so it drives normally again. It is probably a sensor playing up, but because it only happens intermittently it's hard to trace. I would sit down with the dealer and explain the conditions when it happens and give them as much information as possible to trace the cause of the problem.

No. The manufacturer determines the vehicle's towing capacity taking into consideration things like the design of the vehicle, its rear axle load, tyres and the effect the trailer will have on the vehicle's attitude and stability. You can measure the tow ball weight using bathroom scales, or putting the laden trailer across a weighbridge and getting the weight borne by the axle/axles. The tow ball weight will be the total weight minus the load on the axle/  axles. It's generally about 10 percent of the total weight of the loaded trailer.

Your car has a Continuously Variable Transmission (CVT), which is quite different to a conventional automatic transmission in the way it works. What you're observing is probably a characteristic of the CVT as the dealer has told you.

We haven't heard of other 380s that have suffered the same problem, but in the course of our checking we heard of a VZ Commodore that had the same problem when the accelerator pedal broke.