Posted by Gun guru on December 30, 2008 at 17:37:34 from (68.188.232.38):
In Reply to: oil change intervals posted by buickanddeere on December 30, 2008 at 08:45:50:
Hello, This is subject I went to school for and have some experience with. I will say this, Synthetic oil Will last longer up to 20,000 miles if its Amsoil, (They say change every 20k miles or something) I never did that with Amsoil I changed it out every 10K. I judge oil by the pour point and the flash point. The pour point is defined as: The lowest temp. at which it is still a liquid and pour out of a cup. Most cases with Standard Petrol oil is -30F. I have seen Dexron II trans fluid in Gel form (not liquid) at -40. That was at my old employer in the mid-1990's -40f and -40c are the same. Amsoil and Mobil one will pour out of a cup at -60f I have read, I have never tryed this. I dont know where to find anything that will go down to -60f. Now for the heat side of the equation. At 300f standard Petrol oil will cook, at 300f synthetic is not "burned" So to speak. I was taught in Hydraulic school 20 years ago that the oxidation rate doubles for every 20f over 130f. So the hotter the oil gets the quicker it is junk. I am talking about standard Hydraulic oil like Hytran or Mobil DTE 25 used in Machines. Since I Graduated from a Tech school in 1991 there have been many advances in Synthetics, Gm now has their own special Synthetic trans fluid. My own personal opinions are as follows: Synthetic fluids are very good, especially if you live in extreme temp situations, like Norrhern Minnesota or Southern Texas. My Chevy Cobalt has a oil life monitor that pretty much says to change the oil at 7000-8000 miles, according to my driving. (I have not switched over to Mobil one yet) I plan to on the next oil change which will be in about a month. My car now has 32,000 on it. As far as engine oil filter. You get what you pay for. For $7 you get a junk 10 micron filter that is of poor quality in my opinion. The best filters are Wix, Mobil one. Which isnt saying much. I would pay triple for an oil filter that had a real paper element that is quality and had a real case and reverse flow check that worked. If any of you guys have performed oil changes on machines you will see high end filters that cost $100 and up. These are high quality Parker, Schroder, Vickers filters. These filters protect $3000 piston pumps and other expensive hydraulic hardware. You must change engine oil filters every 5k miles, even with synthetic oil. I am done 8itching now.
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