How does the W (weight) of the oil effect performance? is lower that much easier on the engine?

Don't know much how to test that but in my manual book.. They do recommend to use either mobil 1 15w-50 or 0w-40. This oil is new come out by Mobil " Mobil 1 Extended performance has grade for 15w-50 " .
the only I can tell you that is when I driving the car I can feel it is accerlerate faster with less noise. Also, when I get my foot off the panel, the accerlerate still there some how ..it is not lost power right away. The only thing i am thinking right now if just because the oil will stay inside engine longer (15000 instead 10000) so if I can change engine oil filter twice on the time interval..Would it help to keep the oil sensor and the oil clean and use longer (15000 instead of 10000 which MB recommend)

Ok We all here about these mericle formulas for ever lasting youth of our automobiles. But how sure is one to comparing this oil with the standard Mobile one oil I put in my 1992 300-E M103 engine?
I certainly would not trust running my oil changes passed 3000 miles doesn't alot of contamination work it self in to the oil between these cycles of hot and cold start ups in morning cool engine and hot or warm engine during the day.

It doesn't take that much time to change the oil and filter on my 300-E. So what kind of gains can I realisticaly expect to see or gain. Can these gains be measured in real life use with a 1992 Benz.

Bob Geco
Always learn one new thing a day.
and you will spend less time guessing .

Bob - The best motor oil for older engines is HD diesel engine oil. It has a better additive package than any modern spark ignition oil regardless of base stock. There is much discussion about this in the archives.

Mercedes' recommended oil change interval for our cars is six months or 7500 miles, whichever occurs first. My recommendation is every 5000 miles or one year for cars that see less than 5000 miles annual mileage accumulation.

Duke

be honest with you I am not worry to get dirty since my car have thishttp://www.fumotovalve.com/
(thanks to one of the member of this forum).and the oild filter is right on top of the engine. I will test with my caR ML320 yrs 2002 then will let you know how it come out by c/o the oil filter at 7000 miles or will contact to Mobil company for more answer.
I don't think Mobil willing to take that risk enough to loose a good/big customer like BMW or MB.
One more thing, if the oil come out so diirty or you want to keep your engine run at the top notch of performance...How about flushing your engine every 60000 or 50000 miles? You will be suprpise to see what come out from your engine even you are c/o oil at 3000 miles.
for gain is you are making this enviroment better ,big money save in your pocket and more quality time with your love one

Our '02 wagon has been fed a diet of M1 0W-40 since new. The service A/B indicator is followed. We typically travel 10-11k miles between services. I have done 1 UOA and the result was excellent; I think I posted it here. I am about to do a 2nd UOA in the next few weeks when the B service is due.

The oil is still fairly clean (darkened, but still translucent) when drained and could have traveled safely another 3- 4k miles per the UOA documentation.

__________________
1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"

Does anyone care to pontificate on the recent change I made from Mobil 1 to regular dino oil... My mechanic, who's an MB specialist, has been keeping an eye on my head gasket leak on my 97 E320 130k miles. When he learned that I was using Mobil 1 10w30 immediately told me to switch to regular oil. He even said to switch to 15w50, but I just went to regular 10w30.

Since I made the change to regular oil I've noticed that my gas mileage has dropped significantly. I'd guess around 50 miles per tank. Can the switch be that drastic? I just changed plugs and all filters so I can't imagine what else it could be...

Any thoughts?

Hard to say....are you putting off repair work on the head gasket?

There are numerous "high mileage" oils available today that are Group III syn and other Group IV/V full syn oils. Some of these oils are suprisingly good.

You may experience a small drop in fuel economy, but I can't believe it's that signficant when using a dino 10W30.

Mobil 1 0W-40 is the recommended oil for your car per MBUSA and per Mobil...contrary to popular anecdotal evidence.

Well since you have an M104, you should be running 0w40 per spec according to MB and Mobil.


MB does not spec any Xw30 oils afaik.

Also Mobil 1 10w30 never used to be a real synthetic. Group III last I heard, slightly better then dino.

__________________
2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Hatterasguy, there are several xW-30 oils on the approved list. FWIW, ELF recently released FULL-TECH 0W-30 (229.5) and there's a "229.5" specific oil that's 5W-30.

__________________
1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"

Interesting. Never heard of Elf before, Euro brand?

__________________
2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Yes, owned by TOTAL. TOTAL has a huge presence here in the USA but are not widely known. i think they employ 11,000 people and have several blending plants here. They sell basestock oils and have a refinery in TX.

They do a lot of OE spec oils (PAO/Esters) for the Euro auto mfrs incl. Ford.

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The guy I bought my Bimmer from had been using Castrol Syntec (full synthetic) 5W-50 (?!?) since the car's birth, as that is what his garage recommended. This is one strong engine, at almost 250K. I thought, why not, I still use it, and change it at around 7K.

Can't say for sure if the syn. oil is a major part of that engine's healthy longevity or not. I have read, more than once, that if you're going to use it, it's best to use it from the git-go. A car with 50K on dino-oil, as the theory goes, has already gone past the tolerances that a good syn. oil would have maintained. So you're going to be leaking more expensive oil for little gain.

Again, I don't know how true this is, just food for thought.

__________________
Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Good God, my cars burn and leak so much Delo 400 (15w40) that I may never have to seal my driveway again...I'd hate to lubricate the asphalt with $7/quart Mobil1.

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2002 Ford ZX2
2 x 2013 Honda Civics

ntvh,
So you're saying that you went from 0W-40 to 15W-50 and you noticed improvments in acceleration and engine noise? How could this be explained? Is there a scientific reason for it?
I just became the owner of a 1994 E320. After reading this whole discussion I think that the best choice would be to go with the recommended mobile 1 0w-40. And then ntvh mentioned that his ML 320 performed with better acceleration and less engine noise when he switched to 15W-50. what are your thoughts about that? I live in Iowa which is like the north pole in winter and can reach temps of 90 to 100 F in the summer. I was thinking of using 15W-50 during summer and switch to 0W-40 for winter. Any thoughts on this is greatly appreciated.