Question about 1994 Nissan King Cab

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High mileage oil change for a 1994 Nissan Pickup; what to use?

How much oil (and what kind of oil) do I need when changing the oil on a 4-cylinder 2-wheel drive 1994 Nissan King cab pickup truck with 240,000 miles? If it is starting to blow smoke from the exhaust; is there an additive that I should use during the oil change to help reduce the amount of smoke I am putting out? (The truck runs great, but the frame is rusting out terribly - such a shame!)

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  • Nissan Master
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Mkimdaly: There is a product on the market called "Restore" which is an oil additive designed specifically for high mileage engines with oil consumption and smoking problems. Mind you, it will not fix evey situation, but it has resolved quite a few on cars which have come through my shop. "Mechanic in a can".
If I am not mistaken, it is designed to fill in small scratches that may be in the cylinder walls. I also has an effect on lifters and on oil seals. There is also a product put out by "Lubromoly" it is a product made in Germany and you may not find it on the shelves at normal retailers, but possibly carried at repair shops which specialize in imports. I carry this product line at my shop and have had good luck with many of their other products as well. There is a company called "Worldpac" but they only sell to repair shops. The product line I am talking about, I have to buy must be bought by the case.
I am sure there may be other comparable products on the market which you may find at "OReilley's or Autozone. You need to speak to their sales people and possibly ask to talk to one of the people who are at their wholesale desk at the back who may be even more familiar with the products. FOLLOW THE INSTRUCTIONS CAREFULLY! The main reason many products don't seem to work well, is that they are not applied as the manufacturer had instructed in the can and/or box! A product as old as the hills and twice as dusty is "Marvel Mystery oil" I have used it on engines which had little or no compression and pulled the plugs, poured the oil in the cylinders and let it sit over night. I would spin the engine over in the morning to blow the oil out, screw the plugs back in and fire the engine back up. There have been many times than I have had engine regain compression because the oil freed up rings that had stuck to the pistons. This oil can be added to the motor oil and the GAS! As far as the type of oil to use in the engine: It really depends on how well you have taken care of your engine to begin with. If you have done frequent oil and filter changes and the engine is relatively clean inside, I would run a 20W-40 with the additive and in my shop, I happen to use Castrol. Although most premium oils will perform quite well. If you have an engine with a lot of sludge buildup inside it, the sludge is probably the only thing holding it together. WARNING!!!!! DO NOT USE ANY KIND OF ENGINE FLUSH DESIGNED TO CLEAN THE INTERNALS OF THE ENGINE! When I refer to this, I mean a product that instructs you to put it in, run the engine for a while, drain it and then replace the oil and filter. YOU WILL IN ALL LIKELY HOOD DO MORE HARM TO THE ENGINE THAN HELP!
I hope I have answered your question.
Good luck.

Posted on Jul 17, 2009

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  • Master
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With filter about 5 litres then start & check level again
as for the smoke there are addatives you can buy but id say its at least you have worn
valve stem seals! they can be replaced without removing the head using a compressed air pumped into each cylinder to hold the valves up! you can then remove rockers etc & slied on new seals it a easy fix

Posted on Jul 17, 2009

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The smoke your seeing is oil burn off. This indicates that the piston rings and cylinder bores are worn out and not sealing very well. there are some additives you can use but they are considered "snake-oil" repairs. If it was me i would look inito retiring the truck since the frame is rusting out as you mentioned. The additive comes in many different names but one I can remeber was called Motor Honey. It is very thick and slow to flow from the bottle. Visit your local auto parts store and look at the selection offered. Hope this helps.

Posted on Jul 17, 2009

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  • Nissan Master
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With 240,000 miles on the engine,you should do a Seafoam treatment on the truck.

Seafoam is in a white metal can. You can find it in any auto part store.

1/3 can in the gas tank

1/3 can in the oil

1/3 can in the throttle body (same as carb) WAIT 1 hour or longer then start it up.

After the smoke clear then do an oil change


I will use 10W40 high mileage is your engine is a leaker.

add few oz of Seafoam into the oil to free up the rings.

With the oil filter change you should buy 6 quarts.
<5 quarts for engine and 1 quart for top off later.

Posted on Jul 17, 2009

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