96 4runner 6 cyl intermittent overheating problem seem to happen when I speed up when traffic frees up. constant speed seems to be ok or even in traffic no problem.

The only place, oil and water share a gasket is the cylinder head gasket, oil and water galleries run through the engine block and head via the head gasket. The cylinder pressure will be OK, it's the oil pressure that's putting the oil in the coolant, the gasket has gone between the water and oil galleries or there is an internal crack (unlikely). A coolant pressure test should show it up.

please scan the ECM for codes and post them

try changing the fuel filter and adding injector cleaner to full tank of gas

Spark plugs in your car are good for 100,000 miles. try changing fuel filter and add a can of B&G 44K fuel additive. This stuff is the best on the market and only available at dealerships. It conditions fuel pump and injectors, also absorbs water in fuel (methanol). Try this first, your car is too new for any other problems. this should help drivability and fuel mileage. If Nissan does not have B&G, I know Toyota does. Also stay with 91 octane fuel. Check oil and coolant often. do not risk overheating in traffic, watch your gauges......

sounds like a loose connection somewhere start by checking the earth connections to gearbox and engine.hope this helps

As far as overheating,I would try a thermostat but before you do anything I have a couple of questions.What size engine is in it?Can you describe a little bit about how it feels like it is running on 4 cyl. instead of 6?Just feels less powerful,but it felt more powerful before it overheated?You mentioned it just cranks over so it is not running right now?Please let me know and I will reply ASAP.I am usually on in the AM EST,but will be on a little while more tonight too.Thanks,Greg

you know check the valves clearance first and oil it well doing so your problem will be solve.thank you

I would have the transmission speed sensor replaced, had the same problem on my Dakota

Overheating is the cause for the warp. Most cases a rotor gets warped when it's constantly gets overheated from driving habits. Like constantly stopping at the last minute, driving downhill in slow traffic, and etc. Or, possibility it could be just cheap low grade rotors. Plus, the wrong type of brake shoe can play a part by causing high heat friction.

The best advice is to take the car to have it inspected by a shop before you buy it. There maybe some unforeseen problems ahead. Better safe than sorry.

check the relays in between cooling fans they are known for the connections corroding