From reading a thread over the general tech help forum, I gathered that Mobile 1 15W50 may be the best option for Discos mainly because of an addative missingin more common oils. Found this "Extended Performance" 15W50 on Amazon:

http://www.amazon.com/Mobil-15W50-Sy...822&sr=1-1

Thought I'd move this question over to the Disco forum. Is this an oil worth seeking out? Or another option?

(The thread I'm referencing is here: https://landroverforums.com/m_36151/tm.htm)

 

I say yes, only because Advance Auto has a deal that works out to$3.60 / qt. if you get the filter too. I bought a years worth (I got 0w-40 for the winter). If it wasn't for that, I would have gone with some Rotella T.Sometimes I don't think it matters one bit and just want to buy whatever is cheapest, but change it very often. The world of engine oils is a confusing one for sure.

 

Yes thicker oil protects better because it doesnt break down as fast as thinner oils (better heat tolorance), no it isintAPI rated to to help MPG, but in real wolrd driving would youor I beable to tell? It also has more additives to protect better.
I use M1 15w50 in my '97. I switched to it after I bought the trk, my second oil change was at 155,000 miles. I use this oil exclusively with Mopar oil filters and change my oil every 5,000 miles. I am now over 172,000. After 5,000 miles I am down maybe half a quart of oil.
You can buy the oil and filters at Wal-Mart, the oil even comes in a 5 quart jug for $23.
And here is a tip, after you change your oil pick one bottle and dump your others into it. Let them drain overnight, after all is said and done you will have recovered about half a quart of oil.

 

I took advantage of the Mobile 1 sale, great deal at $26 and change with a filter plus one extra quart.
You might consider using the Mobil 1 High Mileage for 75,000 miles and over, along with their M1-301 extra large filter.

 

in certin situations YES but dependet on out side temp, specially on startup it could cause more wear than say a 5W-40 or a 5W-50. I think we might agree that the concensis is that most normal wear comes from start up.


I have Delo 400 15W-40 in the crank case now myself.

 

For lots of folks, motor oil is religion. For the car manufacturer, it's combination of science and regulation, the latter of which is mostly religion as well. The science says that nearly all of thewear an automotive engine receives occurs at startup, particularly at cold temperatures.

Knowing this, it is a short bit of logic (also supported by the science) to conclude that maximum fluidity and pumpability at ambient temperatures the vehicle will encounter while the oil is in the engineare far more critical than any other factor in engine wear. The science also says that an oil with 30 viscosity at running temperature is adequate to protect the engine when in operation, through all power settings and driving conditions, while 5w or 10w rating when cold is preferable because it protects better in the phase of operation where most wear occurs. All of this assumes proper proportions of antiwear additives formulated into the oil.

Why on earth is anyone here advocating running 15w-50 oil as preferable to what the manufacturer recommends...who has studied the science carefully to arrive at their recommendations?

Dave

 

I tried a couple of grade myself, and found that when using 10W40, I had a ticking sound that I figured was due to the lack of fluidity at start-up. I switched to 10W30 and was glad to see that the ticking was gone and that it wasn't a new problem. Since then, I've used Mobil1 5W30 in the winter, and 10W30 in the warmer months.

 

I posted this on the other thread as well but here is ZDDP info I received from API.

Anyway, the following information is direct from API. There is no minimum ZDDP requirement unless otherwise noted.

API ZDDP Specifications (maximim):
SH
5W-30 0.12 (1200ppm)
10W-30 0.12
15W-40 No Requirement

SJ, SL
0W-20 0.1 (1000ppm)
5W-20 0.1
5W-30 0.1
10W-30 0.1
All Others No Requirement

SM
ASTM D 4951 Max
0W-20 0.08 (800ppm)
5W-20 0.08
5W-30 0.08
10W-30 0.08
All Others No Requirement
ASTM D 4951 Minimum of .06 for all grades

ILSAC GF-4 Minimum Performance Standard for Passenger Car Engine Oils (Effective July 31, 2004)
ASTM D 4951
0.08 (max)


additionally, no requirement does not mean that no zddp is present simply that there is no API established min or max.

 

Tee51397, je comprend absolument rien de ce que tu viens d'écrire. Aurais-tu l'obligeance d'expliquer avec des termes que le monde normal peux comprendre s.v.p ??? Aussi technique que les gens içi s'efforce d'être, on ne peux pas plus lire ce que tu as écris, que toi tu peux comprendre un mot de mon texte.

Darover.

 

Pas d' Probleme- vous faites lire l'autre "thread?" et J'ai compris chaque mot que vous avez ecrit. Peut-etre je n'ai pas compris votre intention, mais vous n'avez pas besoin d'être grossier. veuillez pardonner mon mauvais français aussi, je suis hors de la pratique.

ZDDP is an essential additive for the protection of our mid cam flat tappet engines. These levels have been declining because of speculation that they foul catalytic converters. Not that ZDDP is the only important factor but the new lower levels can/do cause increased wear. Some oils are API certified, the above post references the zddp levels for the different API classifications (the letters in bold), again most of this is clarified in the OP's referenced thread: https://landroverforums.com/m_36151/tm.htm and if the topic of this post is of interest I would suggest at least checking it out.

I apologize if the above information was unclear, however, a simple search of the interweb will also reveal an enormous amount of information... and, of course, misinformation on the subject.

I'm simply passing along the information given to my by API when I contacted them to shed a little light on what the current ZDDP requirements are and thought others may find it useful as well.

-T-