Jesus man, i guess you have a bit of money. That's like a $90 oil change right there. Totally unnecessary in a high mileage engine, especially the 4.0L. Royal Purple is a good maintainer and race oil, but in an engine that has not used RP for every oil change since it rolled off the line, it doesn't have much benefit over a less expensive oil.

OP look into Advance Auto's oil change deals. They run a couple different ones each month. You can grab a 5 quart jug of name brand full synthetic and a premium oil filter for <$30 with the deals they have.

For filters, stick to the good brands - Bosch, Purolator PureOne, Mobil 1, and K&N (same as a Mobil1 filter, just with a nut). Never a Fram - a quick search will yield why).

For oil, if you do your research you will find 5w-30 is the most recommended weight to run in our engines. It has the correct viscosity for out engines and is not too think to cause unnecessary wear at cold startup (note in this case "cold" means anything below 212F). Brand is not as much of a concern, just run a name brand oil.

No extra additives. A lot of research is put into the additives already in the oil. Adding other/additional quantities will not help, and may hurt the ability of the base oil to do it's job. A good example of this is Lucas oil treatment, which has been shown to have bad foaming properties (mainly in hypoid gearsets, but in engines as well).


Now a bit of a rant....

A few posters have mentioned Rotella T heavyweight diesel oil. I would not run anything greater than a 10w-30 oil in our engines. It's what they were designed for - using anything heavier than that will just cause components to wear out faster, and cause the engine to work harder to pump it, resulting in less flow and poorer lubrication. This has been covered MANY times yet people still follow the pack on this.

And as far as the ZDDP content issue, there is no need. Yes the 4.0L has a flat tappet cam, but the weak valve springs don't insinuate the need for a high ZDDP oil. In fact, with a higher ZDDP oil you will ruin your cats before the engine shows increased wear. It's simple unnecessary unless you're breaking in an engine, or are running a massive torque breathing monster engine.



ok so after that rant, my recommendations are:

1) a good name brand 5w-30 oil - I personally like the synthetic blends since they give a good balance of cost effectiveness and hold up well.
2) a good oil filter - very important - I prefer Pureolator PureOne filters.
3) no additives of any sort.

hey dukie, i just like to know i give the best i can to my xj, when it comes to engine, diffs, transfer and tranny maintenance i empty my pockets without a doubt, i dont care much about the looks, usually i save like 20bucks a week to use later in my xj, i have stupid things like gold plated battery terminals, i'm kind of neurotic having the xj as good as new.

Thanks everyone for the feedback! I went with 5qt Rotella T 10-30 conventional and 1qt royal purple 10-30 synthetic along with the K&N filter. Gonna do the change tomorrow seeing as though in down in Ft. Lauderdale for the night like 30min from here.

Truck backs up and drop 1000 gallons.....try again.

We ordered 8000 gallons of oil at a time. Our smallest tank was an 8000 gallon, divided in half for Delo and Delvac. 10,000 gallon oil tanks are the norm for quick lube places. 8000 gallons is a "truck load" and by far the cheapest way to order it.

The tank room was massive and underground! With the advent of 0w20 in most of the new cars, the standard set up will need to be 10k@0w20, and a 10k@5w30 and a 10k@10w30. Possibly a 10k@10w40. There would also be a waste oil tank in the mix. So figure 40 to 50 thousand gallons of oil in storage at anyone time plus a couple of hundred in bottles for the odd ball stuff.

Ron

Did you use Rotella T5 Synthetic Blend? If so, that is an awesome oil for our 4.0s in my opinion. It has the 10w-30 factory weight suggested fro use in the 4.0 and 2.5, and has High levels of Zinc/Phospherous that does help protect our flat tappet cams. The Synthetic part of Rotella T5 is supposedly a Group 4 base oil, meaning it comes from Natural Gas, and combined with the high quality Group 2 base oil Shell mixes provides a combination of good Cold weather pumpability, High temperature protection, and High Anti wear protection. I mean this oil is meant for High dollar diesel engines that cost 5 to 10 times the money of the newest 4.0, so its good enough for my Jeeps. Oil leaks seem to slow down also with this oil. And NAPA 21515 ProSelect or 1515 Gold are my Favorite oil filters for my 96, 99, and Beloved SilverStone Metallic 01.

I got the Rotella T. It doesn't have a number. It was either the T or the T6

+1 victorlanda. Oh, and by the way, Duke sucks. I'm originally from North Carolina and I would pull for Baghdad over Dook. They can't even spell potential recruits' names right.

I did not see this mentioned so I will offer it. you can put regular filters on your XJ or you can put an oversize filter on. For example, if you use NAPA filters, the standard filter is the Gold 1085. You can also use the oversize gold 1515. several of the other brands offer this as well. search oversize filters and you can get more info. This allows you to either add an extra 1/2 qt of oil or get more filter area.

My name has nothing to do with Duke. I went to Penn State. It's a play on my last name.

You don't want to mix conventional and synthetic oil

Thank God. I've been wondering how they like you up in Maryland. Sorry to paint you in that light, then!

haha

**** Duke

Everything thing I read said it was fine. Even Mobil Oil said it. You can't mix it like 50/50. The guys on here reccomend it

What "guys" recommend that?

If you were mixing the same brand and weight dino/synth I'd say you'd likely be fine, but different manufactures use different additive packages in their oil production. Mixing these can have adverse effects of diluting additives in the oil. This is not a good thing - the oil will wear out quicker and will not give your engine the protection intended .

ive never heard of mixing oils...i will only use castrol gtx high mileage and purolator or mopar filters..although I heard the walmart brand oil filters are really good and this man did a study.on them and uses them on his dodge...