This is from the September or October 2002 Popular Mechanics magazine: http://popularmechanics.com/automotive/auto_technology/2002/8/motor_oil/index.phtml There are four pages to this article selectable at the bottom of each page.
quote:Clicked the wrong button again...wish we could edit. d) Makes synthetic blends sound like a good bargain e) Are all these claims true for high-mileage-vehicle oils?...sure are great goals. d) Confuses the descriptions of Group III and Group IV synthetics f) Probably more.... Ken
Originally posted by Ken: A really sketchy article. I found these error: a) Omitted the new diesel lube service category CI-4 b) Wrong about W rated oils being tested at 0°F c) Implies that 10W-40 is superior to 10W-30
quote:I'll have to disagree on this one. I don't think they were implying that at all. Here's a snippet: Viscosity (a fluid's resistance to flow) is rated at 0° F (represented by the number preceding the "W" [for Winter]) and at 212° F (represented by the second number in the viscosity designation). So 10W-30 oil has less viscosity when cold and hot than does 20W-50. Motor oil thins as it heats and thickens as it cools. So, with the right additives to help it resist thinning too much, an oil can be rated for one viscosity when cold, another when hot. The more resistant it is to thinning, the higher the second number (10W-40 versus 10W-30, for example) and that's good. Within reason, thicker oil generally seals better and maintains a better film of lubrication between moving parts.... ...Once the engine is running, the oil heats up. The second number in the viscosity rating--the "40" in 10W-40, for example--tells you that the oil will stay thicker at high temperatures than one with a lower second number--the "30" in 10W-30, for example. What's really important is that you use the oil viscosity your car's owner's manual recommends. The one thing they were very careful on was the definition of Full Synthetic: The so-called full synthetics contain chemicals that may be derived from petroleum but they're altered so much that they're not considered natural oil anymore. ...yeah, okay Oz
Originally posted by Ken: c) Implies that 10W-40 is superior to 10W-30
quote:I wondered about that too. All in all I'd give the article a D+ But thanks for posting it dagmando. It gave us some entertainment.
Originally posted by dragboat: In the Article they wrote this on Synthetics; ( In fact, there may be some features that your car's engine needs that the synthetics don't have.) Now whats that about
quote:I was hoping for a quick answer since I will be seeing my Bro-in-Law that owns the Dodge Dealership over the July 4th Weekend. Thanks
Originally posted by red2rebel: 2 Questions ... What Vehicle Owners Manuals state... "NO SYNTHETICS"? That being asked ... what is the TRUTH ... WHAT ENGINES CAN NOT/SHOULD NOT USE SYNTHETICS?
quote:I guess that's why Mobil 1 10w30 has ALWAYS been the factory fill oil in Dodge Vipers.
Originally posted by red2rebel: I just read in a 2004 PT Cruiser manual that the use of synthetic oils is acceptable. This information conflicts with a service bulletin I read serveral months ago which stated use of synthetic oil is NOT recommended in Chrysler engines. Comments?