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Car Forum / Mercedes-Benz Cars / December 2007Switched to Synthetic
Pursuant to earlier posts regarding the perennial debates about oil, today I put in a new oil filter and added Amsoil Flush, ran according to instructions, then dropped oil, changed to a new filter again, and replenished with Amsoil 15-40. BTW, this is in a '79 non-turbo 300D with 200K. Everything is running smoothly, albeit idle now a little high with idle manual throttle closed, and I intend to extend my drain interval from 2,500 to 5,000-6,000 miles, but am considering changing filters at 2,500-3,000. Does anyone have any strong opinions on any of this? Should I adjust my injector for the idle? Thanks again. > Pursuant to earlier posts regarding the perennial debates about oil, > today I put in a new oil filter and added Amsoil Flush, ran [quoted text clipped - 13 lines] > > Thanks again. My opinion is to use rotella or the like because of the superior particulate suspension. My sense (don't know for sure) is that a 79 diesel will make the amsoil just as dirty just as fast as dino oil. Particulates in the oil are a source of early demise for diesels. My opinion is dino oil changed every three thousand miles is a sufficient and more economical choice. The high idle could be a lot of things, e.g collapsed motor mounts preventing the throttle linkage from returning all the way, rack damper.adjustment etc. YMMV I tried synthetic, Amsoil and Mobile One in my 300 TDT when it had about 350,000 miles on it. I just reinstalled the engine after having it remanufactured. I am not sure if it was the synthetic oil, but my engine, which had remained stable for a long time, went rapidly downhill after I switched to synthetic. I asked the owner at the place that remanufactured my engine, Metric Motors in Canuga Park, CA if he would recommend synthetic oil. He does not recommend synthetic. He feels that since the diesel engine puts a lot of carbon into the oil the extended driving distance between oil changes with synthetic is not a good idea. I put synthetic oil into a couple of gas engine Toyotas that I drive and I noticed an increase in fuel economy. I did not notice a boost in fuel economy with my 300 TDT. > "randallbr...@mac.com" <randallbr...@gmail.com> wrote in message > [quoted text clipped - 30 lines] > > YMMV > I tried synthetic, Amsoil and Mobile One in my 300 TDT when it had > about 350,000 miles on it. I just reinstalled the engine after having [quoted text clipped - 46 lines] > > > YMMV I was a bit confused by your message, in that if you had just had the engine overhauled, then the engine would not have been "stable for a long time" and therefore, the deterioration may have been due to some factor other than the choice of oil, e.g., a bad overhaul, etc. Ask the big rig truck drivers... they got the most mileage under their belt. Synthetic is supposed to be far superior keeping carbon in suspension. New Mercedes engine recommends 7500 miles per oil change... synthetic required... as for 350,000 miles... come on! Getting 350,000 miles on an engine that you are not original owner from beginning is already great. > Synthetic is supposed to be far superior keeping carbon in suspension. Isn't preventing sludge deposits by keeping particulates in suspension only half the battle, though? Can't the particulates that are in suspension still cause wear by coming in between moving parts? That's why I used Mobil 1 in my 300D 2.5, but changed it at 5,000-mile intervals. It was the best of both worlds: the lubricity of of syn- thetic, and the cleanliness of frequently-changed oil of whatever sort. Geoff -- "My advice to her [Britney Spears] would be to start shooting the dog porn videos now, and thus set aside a little cash for her retirement." -- Speedbump Particulates are to be controlled by the oil filter... There is zero way to completely trap the particulate that it would clogged up the filter and starve engine of oil. By Mercedes design... those particulate still in suspension are not that harmful as you would think until the point of high concentration. > Ask the big rig truck drivers... they got the most mileage under > their belt. [quoted text clipped - 5 lines] > as for 350,000 miles... come on! Getting 350,000 miles on an engine > that you are not original owner from beginning is already great. Based on what I read synthetic oil *does not protect your engine any better* it simply breaks down less over time and requires fewer additives to maintain its viscosity. I can find no claims for improved particulate suspension in any oils other than rotella or delvac. Diesels generate much more soot and acidic combustion blow-by in the crankcase. Turbochargers subject motor oils to high temperatures and are more prone to form engine deposits. High milage engines generate more blow-by as well. which is why changing oil in diesels more frequently is better, it protects the bottom end of the motor. http://www.newton.dep.anl.gov/askasci/eng99/eng99488.htm So, according to the above you should still change your oil filter at the frequency of the manufactures specification regardless of the type of oil. As long as you are changing oil at the recomended intervals, synthetic is not better (unless of course the manufacturer requires synthetic, google the FSS law suit against mercedes for an example) Anyway dino vs. synthetic often degrades into a religious debate and I just don't have time for religious debates. I simply am saying what I would do with regard to oil changes on a car of that vintage. > Pursuant to earlier posts regarding the perennial debates about oil, > today I put in a new oil filter and added Amsoil Flush, ran according > to instructions, then dropped oil, changed to a new filter again, and > replenished with Amsoil 15-40. What's the advantage of using Amsoil Flush, versus going down to Pep Boys or wherever and buying a can of that generic "engine flush" (which in reality is just kerosene), and letting it run through your engine at idle for ten or fifteem minutes before you change your oil? Geoff -- "My advice to her [Britney Spears] would be to start shooting the dog porn videos now, and thus set aside a little cash for her retirement." -- Speedbump To clarify my earlier post; I started using synthetic at 350,000 miles on the engine. The engine then deteriorated over the next 45,000 miles to the point that it had sever blowby and oil leakage and was hard to start. I then decided to have the engine remanufactured. The remanufacture guy recommended using dino oil I am using dino oil in the new engine and changing when hot every 2000-2500 miles, which was the old regimen in my 300 TDT for the first 200,000 miles I drove it. (The car had 144,000 on the odometer when I bought it in 1993.) Paul > randallbr...@mac.com <randallbr...@gmail.com> writes: > > Pursuant to earlier posts regarding the perennial debates about oil, [quoted text clipped - 13 lines] > the dog porn videos now, and thus set aside a little cash for > her retirement." -- Speedbump > To clarify my earlier post; > [quoted text clipped - 31 lines] > > the dog porn videos now, and thus set aside a little cash for > > her retirement." -- Speedbump I'm not disputing that you'll find diehards that won't recommend synthetic oil. I was that way myself for many years before switching, and didn't do so until I had satisfied myself throhgh a great deal of research and study, asking members on here, etc. I'm now very happy that I have switched and have become convinced that the synthetic has not only superior lubricating qualities, but superior carbon suspension and protection against carbon abrasives, resulting in less wear. I want my 617 engine to go to at least 500K, and I believe it will, as many commercial operators far exceed that under much worse conditions than anything I subject my 300D to. > "... I am using dino oil in the new engine and changing when hot every > 2000-2500 miles... > Paul Re: "When hot..." - because it's got paraffin and we know what happens to wax when it gets cold. > randallbr...@mac.com <randallbr...@gmail.com> writes: > > Pursuant to earlier posts regarding the perennial debates about oil, [quoted text clipped - 13 lines] > the dog porn videos now, and thus set aside a little cash for > her retirement." -- Speedbump I don't know that there is any advantage. What I do know is that Amsoil products seem to be of high quality, and I have had good success with the various synthetic oils and other products for some years. WHile it may not always be true, I tend to believe at least to a degree that you get what you pay for, and should err on the side of a known commodity when putting a product in your M-B engine. [Amsoil Flush] > I don't know that there is any advantage. What I do know is that > Amsoil products seem to be of high quality, and I have had good > success with the various synthetic oils and other products for some > years. How does one determine "success" with a particular brand of motor oil? By the engine not failing when the stuff is in the crankcase? But I understand what you mean about erring on the side of quality. Geoff -- "Wit goes for the jugular, not the jocular." -- Florence King > randallbr...@mac.com <randallbr...@gmail.com> writes: > [quoted text clipped - 14 lines] > -- > "Wit goes for the jugular, not the jocular." -- Florence King By "success" in this case, I mean that my engines get very high time between overhauls, without breakdown or failure, thus attesting to the efficacy of the products I use. I can say, conversely, that in my younger, less enlightened days as a Pensoil devotee, I did not have such success. I am using Amsoil 5-50 in my 4.2 litre 420 sel, 1988. From what I understand -BIG- deffernce. Synthetic is much more readily to lubricate, especially in cold weather starts, which is hard on any motor. Synthetic does not near "coagulate" like conventional, and can withstand heat better as well. No comparison... > Pursuant to earlier posts regarding the perennial debates about oil, > today I put in a new oil filter and added Amsoil Flush, ran according [quoted text clipped - 10 lines] > > Thanks again. > I am using Amsoil 5-50 in my 4.2 litre 420 sel, 1988. From what I > understand -BIG- deffernce. Synthetic is much more readily to lubricate, [quoted text clipped - 18 lines] > > > Thanks again. I am using the Amsoil 20-50, and am very pleased with it. I agree with all your statements regarding the superior lubricating qualities. |
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