Am I wrong.............dude?

 

iv always had rotella diesel oil in mine cuz i get it free at my dads shop (they have a fleet of semis) and my other car is a diesel, i mostly use it because even with the thicker oil my xj leaks oil like its noones business but i havent had a problem yet :P

 

I do not believe the 1 year thing to be accurate. It could be the case if the company changed their formulations within that year but I would say that's unlikely unless the old sample came from a old API rated formulation. Each company I would assume has its own QC procedures so fluctuations from bottle to bottle should be minimal.

To answer your second question, is all those other anti-wear additives just as good as zddp, time will tell.. I say yes they are if not better but thats relying on the improvements with technology and science behind all these "new" replacements. This is all within reason ofcourse, zddp is a proven great additive but there is other great additives. I think each will have their own opinion if these are better or not though.

There are many "upto date" VOA's just pull them up or search for your oil. Rotella T6 is towards the top and was done recently back in July.

This link is for a API Rated: SN (the most recent) *it is conventional NextGen (50% recycled oil)
http://bobistheoilguy.com/forums/ubb...00#Post2194500

 

i dont know why i was thinking 4.0 instead of 4.9 i was gonna put 300 but i figure that would have messed up the young ones .

 

This is true, however the only oil that comes close to those weights is the 5w40 Rotella and 0w40 Mobil 1 in my area. The Mobil 1 is $28 for four quarts, nevermind 6.

 

Price isnt really my issue although cheaper would be nice! Im looking for quality, So it sounds like Rotella is the best of both worlds lol

 

I've run the Rotella 15w-40 in my XJ year round since I got it a couple years ago. 380,XXX on the clock and counting... Been in and out of the ocean too :O high tide......

 

Any brand 5w-40 weight Diesel oil has the best of both worlds, low temperature start-up flow and High temperature protection(40 weight thickness). Whoever said diesel oils have low detergent levels is completely wrong. Diesel oils have elevated detergent, dispersant, anti-wear(Zinc/Phospherous, ZDDP), anti foam levels to keep diesel engines clean and free of soot buildup and acid corrosion. I have run Chevron Delo 400 15w-40 and Shell Rotella T straight 30 weight oils in warmer weather with good results. These oils can go the extra mile(extended intervals) with their High TBN(Total Base Number) of additives that keep the oil cleaning and help keep the oil in grade longer(15w-40 to 15w-39, 15w-38, 15w-37, etc). I mean, think about it, if these oils are designed to keep $10,000 to $30,000 diesel engines alive for half a million miles plus with extended drain intervals of up to 50,000 miles on one change, then they must be good. I havent tried a 5w-40 weight diesel oil yet in any of my Cherokees, even though i have a decent stash of Mobil 1 Turbo Diesel(20+ quarts). Maby in the fall.

 

If you need any more info, lookup Bobistheoilguy.com for diesel oil use in Cherokees. 440Magnum is a Cherokee Head, and uses Diesel oils in his Jeeps.

 

Where does it say 5W40 is "diesel oil".......not anywhere on the Rotella bottle.

 

5/40 is syn rotella diesel oil.

i have been running Delo 15/40 in my Civics and Jeep for years. $31 for 3 gallons at Costco.

 

on the formulations change over time argument...

If you will permit an analogy, brand name oil and brand name coffee have a lot in common. Consumers want a constant experience with a product that is why they buy the product in the first place. In the case of coffee this presents a huge problem the flavor of a bean is affected so much by factors like air and soil temperature, air quality, humidity, when it is watered and on and on. As a result big brands are always changing their sources not to get a different result but to keep the same result. And all of that is done with an eye on the bottom line.

Similarly each oil well is different and can change in composition as the level drops from pumping. So the oil company must constantly balance these changes in raw materials against the range of acceptable output that can be called brand Y weight z that meets or exceeds standard Q. That alone can explain the formulation changes then you have army's of people doing constrained optimization work to figure out the lowest cost recipe for brand Y weight z that meets or exceeds standard Q given the additives available.

As a result I would believe the formulation can change from month to month or more often.

*disclamer
I am not a coffee drinker but I do watch the history channel more than anyone should.

PS this is the internet and I have found that scientific internet experts usually look, act, and sound a lot like the rest of us.
just a thought.

 

I've run Rotella 15W40 in my older motorcycles because of its added ZDDP and lack of friction modifiers. The ZDDP isn't needed just during break-in for flat tappet engines......and the lack of friction modifiers makes it suitable in wet clutch applications. I THINK Rotella 15W-40 had its ZDDP level reduced a couple of years back, so the STP 4cyl formula is an alternative source for the ZDDP.

I just changed the oil in my '98 F150 4.2L V6 with Mobil 1 5W-30 full synthetic, and it was $30 for 5 quarts at Auto Zone on sale with a filter. At that price it was similar to Rotella synthetic, otherwise, I would have bought the Shell oil. I put Rotella synthetic in my '96 Cherokee at the last change, and its due again. Both of thes have had synthetic in them since 18K-20K miles. The truck now has 99K and the Jeep 155K. Neither use oil, but the Jeep weeps a little around the valve cover gasket.

I don't see any reason to NOT run the Rotella 15W-40 in an older Jeep 4.0L. The more important thing is to change the oil when needed.