Date: Mon, 05 Nov 2001 23:52:50 GMT
From: Bruce Bergman <>
Subject: Re: Does anyone use synthetic oils?

On Mon, 5 Nov 2001 22:04:11 -0000, "Huw" <> wrote: > >"MEN" > >> I doubt that it actually degrades much. But it will get just as filthy >as >> regular oil, and that's the reason I gave up on synthetic and went >back to >> changing every 3-4K. > >You are correct. The secret of an extended drain potential oil is to >keep the crap in suspension while continuing to lubricate and clean. >Diesel oil gets very dirty black looking but still does the job. In the >case of extended drain intervals useing any SHPD specification, whether >a synthetic formulation or not, the oil gets amazingly dark black but >still performs its lubricating function while keepping its dispersion >and suspension properties. >The oil, if it meets MB228.5 or better, can last amazingly high mileages >if bypass filtration is used in addition to the standard full flow, and >oil analysis is carried out to confirm its suitability for service. >A standard engine should not need an oil change more often than 10,000 >miles if using a suitable oil, though the filter should be changed at or >near the recomended schedule. > >Huw And the reason it makes sense to use a bypass filter and do a periodic oil analysis on large engines (rather than simply change the oil on a time/mileage basis alone) is because large truck engines take 3 to 10 gallons of motor oil to do a change. Locomotives up to 100 gallons of oil, and the huge stationary engines for power plants, water pumping stations and tugboats a few hundred gallons each... It can be an all-day job to do an oil and filter change. The cost of having the oil analysis done has to be significantly cheaper than the materials and labor cost to change the oil. It makes sense for large engines like the above, but the average car or light truck takes only 4 to 5 quarts of oil - having the oil changed is far cheaper than the analysis. Even with synthetic oils it's a wash. With my LandCruiser paying for an oil analysis might make sense, the 'F' motor takes 8.5 quarts of Mobil1 at about $36, versus $40 for the oil analysis - but they're just going to tell me to change the oil every 2nd or 3rd time anyways, so why bother... ;-) --<< Bruce >>-- -- Bruce L. Bergman Return to Main Index

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