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  #1  
Old August 19th, 2004, 01:27 PM
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Nicholas Orros
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OIL...oil...oil...

Fella's...

I know this has been discussed before but I wanted to see what the 'latest' is regarding engine oil.

Well, since I've had the D90 (about 2.5 yrs) I've put AMSOIL in it. I put 10w40 for the first 2 yrs then I switched to 20w50 per the AMSOIL guy's suggestion. It runs fine and I even took his advice and let the oil go for a while, not the 12k that they claim but a good 5k right now... The problem is that it is black & starting to look like there's a minimal amount of 'sludge' in it, not much but enough to notice.

So, I'm thinking of going back to a strict 3k interval but I don't know if I'm going to keep AMSOIL in it. I'm thinking MOBIL1.

My question to you all is what 'weight' MOBIL1 synthetic should I use ? (for a pretty HOT climate)

Also, what are you guys running ? In what climate ?

Thanks

Nicholas Orros
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  #2  
Old August 19th, 2004, 02:13 PM
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Isn't the big selling point of AMSOIL their incredible filters? If I recall correctly, they recommend changing the oil as infrequently as once per year but the oil filter on a per mileage basis. I also recall them not having an AMSOIL brand filter for the the 8-cylinder Rover engines.

If you want to be scientific about engine oil, there are several places that, for a small fee, will test your oil. You prepay for several tests and they send you a handful of small containers. The next time you change your oil, you send them a little bit to analyze and they tell you how the oil held up. As long as your driving patterns don't change significntly, you can use the data to better gauge your oil strategy.
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  #3  
Old August 19th, 2004, 02:24 PM
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I think when you switch to a synthetic, that sometimes it cleans up all the old Dino oil that is still on everything, when this happens the new synthetic oil becomes black and needs to be change. I am not 100% on this, I have just heard of it happening before and that was the explanation.
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  #4  
Old August 19th, 2004, 02:25 PM
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Gotcha... yeah, I know a 'test' would be optimal, but I'm just wondering what everyone is running and what they recommend. I appreciate it though.

AMSOIL filter for a 95 D90 is SDF15


Nicholas
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  #5  
Old August 19th, 2004, 02:49 PM
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This D-90 that I just bought has been running AMSOIL in it since 5450 miles and it has 191K on it now. So it must not be too bad. Plus it has their two stage oil filter system in it. The truck runs really well for a truck with that many miles on it. It runs better than my 1995 D-90 with only 46k miles on it. Here is the run down.

Changed and install 2 stage filtration beginning at 5450 miles (Amsoil 0w30)
filters and oil 27702 miles (22252 miles on oil)
filters and oil 45996 miles (18294 miles on oil)
filters and oil 71050 miles (25054 miles on oil)
filters and oil 95831 miles (24781 miles on oil)
filters and oil 122952 miles (27121 miles on oil)
filters and oil 140048 miles (17096 miles on oil)
filters and oil 153426 miles (13378 miles on oil)
filters and oil 167194 miles (13767 miles on oil)
filters and oil 174500 miles ( 7306 miles on oil)
up coming oil and filter change (this weekend) 191324 (16824 miles on oil)

Jeromy
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  #6  
Old August 19th, 2004, 02:59 PM
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did you see this link

http://www.defendersource.com/forum/...read.php?t=438

I posted what oils the manual says to, I run 5w30 Dino oil.
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  #7  
Old August 19th, 2004, 03:35 PM
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yeah, I think I'm going to stick with AMSOIL.
Just called the LR Dealer and they said to go with 20w50... if running synthetic.

Mobil1 seems to be 'almost' as much as AMSOIL so what the hell.

Unless someone has a 'new opinion'.

Thanks

Nicholas
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  #8  
Old August 19th, 2004, 03:47 PM
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The RPI website had a really good article (also printed in LRM, I believe) that discussed how the synthetics drained from the hydraulic lifters quickly (hence all the lifter noise on start up) and that they recommended dino oils. It was a pretty good article, and if I have time, I will search it out. Someone here probably has it marked. That said, I am running synthetic for now, but I may just switch...
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  #9  
Old August 19th, 2004, 03:54 PM
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Same as Mike, I ran 5w30 Dino oil on my 90 only because the first owner who I got it from ran the same since new. I now have 92K miles (12K of them are my miles) and I have nothing to complain about yet.

After all, I use Mobil 0 - isn't that better than Mobil 1?
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  #10  
Old August 19th, 2004, 03:59 PM
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tHE Carrera GT comes with Mobil from the factory so do Vipers and a number of other high performance cars, I think if its good enough for those then it should be good enough for a Defender.
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  #11  
Old August 19th, 2004, 04:27 PM
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Quote:
Originally Posted by rover4x4
...if its good enough for those then it should be good enough for a Defender.
Yes and no Phil.

It all boils down to changing it often. As often as you can afford to. I actually run just synthetic on my D1 since I bought it new in 99. Since I've had a good run on Synt, that's what I stuck with. On the other hand, the D90 hasn't seen Synth since new so it will stay on Dino til it dies. (which I'm hoping at least another 100K miles ) Knock on wood both trucks haven't had any major issues and I attribute it all to the regularity of changing the fluids.
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  #12  
Old August 19th, 2004, 04:47 PM
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Mike mentioned something about switching to synthetic leading to dirty oil for a while. This is true. Synthetic oil has significantly better cleaning properties and will clean out (unclog) dirt in your engine. Often times this dirt blocks small oil leaks in older engines. Switching to synthetic will open the leaks which is why you'll hear people caution against switching with an older engine.

Jeremy, that oil change information is great. How far apart time-wise were the oil changes? I'm curious what the previous owner used as a trigger to change the oil.
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  #13  
Old August 19th, 2004, 06:05 PM
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0w40 mobil one is the finest readily available oil.

Anything that meets Merc. Benz spec is the best.

I have tried pretty much everything . . .

IMHO FWIW YMMV etc etc
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  #14  
Old August 19th, 2004, 06:33 PM
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Nicholas Orros
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Ron,

Finally, a strong statement... and please... I am VERY close to switching, 1 because of the cost and 2 because I want to start doing it myself again.

What makes MOBIL1 0w40 better than say an AMSOIL ?

also, do you use 0w40 in your D ?

The dealer told me either 20w50 (since it's synthetic) or the recommended 10w40. (I used to use that)



Thank you,

Nicholas
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  #15  
Old August 19th, 2004, 06:51 PM
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I read Chris Crane's article about dino oil a couple of days ago and I don't believe it. Land Rover recommend synthetic or semi synthetic I recall in Discoveries and the engine is the same. I swtiched to sythetic - Mobil 1, for my Toyota and true enough it went blackish the first change (now at 6000 miles not 3000, so it costs less than dino) but subsequently it has not changed colour. I also get noticeably better mpg in the thing - as much as 45 mpg (87 camry 4 banger). I am having the Rover serviced next week, and will discuss oils with them before - the place specialises in V8 conversions for MGBs. I remember Chris Crane saying to me just use Castrol GTX but I am a convert to synthetic now.
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  #16  
Old August 19th, 2004, 07:06 PM
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Does anyone out there have any experience with this: ?

Mobil 1 Truck and SUV Formula ?


it's supposedly a 5w40.


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  #17  
Old August 19th, 2004, 08:04 PM
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No doubt any oil is worthless if it is not changed any, I also think the filter is just as important as the oil that you put in your truck.



I would think the weight of the oil would be largely based on the climate in which the truck is being driven?
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  #18  
Old August 19th, 2004, 08:12 PM
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no doubt you have all read this...why change oil....

http://www.performancemotoroil.com/Taxi_test
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  #19  
Old August 20th, 2004, 02:02 AM
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Please understand that I'm a huge fan of synthetic oil when I say this ...

That Taxi cab demonstration is interesting. Unfortunately, all it really proves is that those taxi cabs could have waited longer than 3k miles to change their oil, some as long as 60k. It did show that, under those particular circumstances, AMSOIL will last ok for 60k miles. This is indeed good information.

Had one of their test groups run dino oil for 60k w/out any oil changes, that would have told us just how much better AMSOIL is (was, they've changed their formula once or twice since then) than conventional oil.

Also, a LOT of improvements have been made to motor oil since that test was done 20 years ago.

Follow-up Post:

In addition to several dead links, I ran across an interesting article that describes some technical aspects of motor oil in the FAQ section.

This oil facts article appears to have good information, although the information was published in 1996. It's well worth the fifteen minutes to read.

http://www.repairfaq.org/filipg/AUTO/F_oil_facts.html

The very end of the article on oil additives has a good section about synthetic oil.

Synthetic oils were originally developed for use in gas turbine engines. In most cases they are capable of maintaining their viscosity for longer periods of use and under much greater temperatures and pressures than petroleum products. Commons synthetics used for engine lubrication today are Polyalphaolefin (like Mobil 1) or Dibasic Organic Esters (like AMSOIL). They are fully compatible with conventional oils and can be mixed, providing their ratings match.

http://www.repairfaq.org/filipg/AUTO...html#SLICK_001
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  #20  
Old August 20th, 2004, 01:14 PM
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Why mobil one 0w40?

"0w40 mobil one is the finest READILY AVAILABLE oil."

I am sure Amsoil is good too but I can buy 0w40 at walmart for $4.24 a quart, no ordering, no $7, and IMHO mobil one is as good or better

MB spec is the toughest to meet, basically it is a full synthetic base stock (other mobil ones are not) and it is very viscous. Look at the synthetcis, the 0w40 is clear and pure looking, some of the others look and smell like regular oil (ie non-synthetic base stock).

Like I said YMMV.

LR recomends 5w30 dino for all rover style V8s. 03-04 RRs get BMW OR MB spec (weird as it is BMW but they permit MB spec) synthetic.

The dealer I worked at carried 5w30 quaker state and 5w40 penzoil MB spec synthetic (I have never seen this in stores).

Over the time I was there I put various synthetics in at customer request. All seems fine but the MB spec would be my preference.

Ron

Follow-up Post:

Oh ya, I change my oil every 3k or less and use synthetic, I have used various mobil ones, rotella 5w40, and a few others I am sure , the ones I would not recommend are 15w50 Mobil one (caused lifter rattle and seemed to eat power) and a caveat to the rotella is it is REALLY detergent so be careful if you have old dino and change filters quickly with it.

Ron
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