What is the towing capacity of a 1992 automatic Nissan patrol station wagon Y60 4.2 petrol?

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Get it on a scan tool and check for codes. They appear to have a history of running rough!

https://www.google.com/search?q=1993+Nissan+Patrol.+running+rough

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best place to ask are towbar fitting shops
they have to certify that the modification and stamp the towing capacity
call any nissan service center and they will know
read it in your user manual
it has nothing to do with the transmission but a lot to do with whether the towed vehicle has electric brakes , over ride brakes or no brakes

According to the National Roads and Motorists Association, it says it can tow up to 750 kg when it was new without brakes on load. Maybe a little more with brakes on trailer. I assume it is in very good condition. It can be a bit of a gas guzzler especially with a load.

what is the load capacity and towing together? look at the id plate on the door jam

I assume this is a diesel engine. Diesels are usually problem free until they start aging. One reason could be that the header pump is on its way out. This is the pump that supplies the diesel fuel to the injector pump, Your car is 14 years old already, and it is time to pick up little hassles like this.
Have the pressure from the header pump checked by a technician / service station and compare this with the factory specification (which the technician / service station should be able to give you).
When last did you have the injector nozzles tested / replaced? The nozzles are much like spark plugs on petrol engines, they have a definite lifespan and should be checked and replaced after a while. They are not overly expensive. If the service station is not reputable they might ask a lot of money for the labor to replace and set them up, but that is one of the joys of motoring.
The Patrol is an excellent truck, I used to drive one with a breakdown hoist to tow in vehicles.

this noise is called detonation and is the result of spontaneous combustion occurring from incorrect air/ fuel ratio and timing. Run the fault codes and replace any knock sensors--o2 sensors and any other sensors connected to the air/ fuel mixture

hi, i have a nissan patrol st4500 running on gas and petrol and I need a new valve since it has been bad to switch between gas and petrol, do any of you know where I can order it?

You can find the specs at http://www.nissan.com.au/webpages/support_templates/grade_comparator/Spec_sheets/Patrol%20Wagon%20A4%20Specs%20FEB%2009.pdf

HEAD GASKET NEEDS REPLACING