I know its a simple enough question but i want the purple stranger to be treated right. its a 98 4.0 ohv with...245,000. Ive only owned it for a year now but have every record from previous owner. Heres where my concern with changing the oil and this post come in to play. Since this truck has had 245 miles on it it has had prolong run with the oil. records of every oil change since new show its been added every time. Three reasons i dont want to continue this tradition is, its hard to find, its not cheap and 3 im not sure it really did anything. (the truck runs fine and the exhaust smells normal but is real dense like what it looks like in the winter)

So what are some recommendations for what i should start as a new tradition? Is the high mileage oil worth it?

And as as title says what plugs work best in the 4.0?

I hope this isnt too much of a newb post. I been working on my own vehicles for 15 years but with a site full of owners why not get the consensus of what works best.

 

I run Valvoline 5w30 full synthetic, I really recommend the synthetic. As for the plugs, stick with motorcraft. You can usually catch a good deal on line at advanced auto, delivered to your door.

 

Motorcraft plugs and high mileage mobil 1 synthetic oil

 

As stated above. Motorcraft or Autolite plugs.
High mileage oil. I use Penzoil.

 

I use Valvoline, haven't had to do plugs yet.

 

motorcraft synthetic blend oil, filter and motorcraft plugs

 

mobile 1, the champagne of motor oils. cheers!

 

valvoline makes a full synthetic max-life as well (for vehicles over 75000 miles)

I use mobile 1 full syn.

 

motorcraft plugs (ngk is okay too) and i use amsoil 5w30, also partial to castrol or valvoline or mobile 1

 

High mileage oil is a gimmick, it will expand seals to seal leaks. Until the seals splits.

If you leak oil now I would run a blend and address the leaks, bump up to full syn.

 

Bosh platinum and Royal Purple synthetic

 

I was thinking mobile1 but $7 a quart kinda scared me, but seeing as i only drive it enough to change the oil once a year its not so bad.

 

Advance auto usually has deals when I get it. 5 guards and a filte for 29.95 and that's mobil 1

 

Motorcraft oil, filter and plugs. Do a fuel filter, wires and add lucas oil stabilizer.

 

NGK plugs, and Valvoline oil with Bosch filter.

However, I have some free oil changes left to use at a dealer nearby, so whatever oil and filter they use.

 

i use penzoil high mileage 5-30, fram extended guard filters, and i put some e3-44 plugs in it. they called for the e3-60 but i read on here that the 4.0 likes the 44's better so i got those. she seems to like em.

 

Heads up... I've been hearing about the electrodes dropping off of them e3 plugs after they are exposed to vibration... not a good thing.

 

Do you guys use the Motorcraft SP-432 plugs?

EDIT: Oops. Didn't realize this was the 4.0 section. I'm sure they are different for my 3.0.