rverdoold Posted November 21, 2007 Share Posted November 21, 2007 Just read an article about oil experiments in a subaru GTT (which is the dutch legacy station with a turbo. Article is in Dutch though http://www.extreme-machines.nl/downloads/Olierapport.doc Iron Copp Lead Alum Sil Chr Tin Sod Pot Gemiddelde 0W-40 0,0026 0,0019 0,0013 0,0012 0,0027 0,0003 0,0003 0,0009 0,0003 Gemiddelde 10W-40 0,0015 0,0024 0,0007 0,0006 0,0011 0,0002 0,0002 0,0009 0,0002 gemiddelde 5W-50 0,0013 0,0015 0,0006 0,0004 0,0009 0,0001 0,0002 0,0004 0,0015 Gemiddelde totaal 0,0025 0,0026 0,0015 0,0014 0,0024 0,0002 0,0004 0,0015 0,0004 (gemiddelde = average) This table shows the contents of metals in the oil after driving equal distance of 10k km (not testing 1 batch) This shows that on average the 5w50 has the least wear if metals in oil do indicate engine wear. Does anybody here tried this viscosity, cause seems to be a very nice all year around oil. Quote Link to comment Share on other sites More sharing options...
Reveeen Posted November 21, 2007 Share Posted November 21, 2007 5W is too light an oil for the old junk I drive. (wondering that maybe 5W is not heavy enough to wash metals out) Quote Link to comment Share on other sites More sharing options...
Towel Rail Posted November 22, 2007 Share Posted November 22, 2007 The wear numbers do look excellent, but I don't like how the Mobil and Kendall sheared down to a 30 weight oil. There's nothing about an oil that pumps well at low temperatures (5W) that would keep it from sweeping out contaminants. That's nonsense. - Scott Quote Link to comment Share on other sites More sharing options...
zstalker Posted November 22, 2007 Share Posted November 22, 2007 5W is too light an oil for the old junk I drive. (wondering that maybe 5W is not heavy enough to wash metals out) it only acts like a 5-weight when it's not warmed up, to ease start-up. once you're up to operating temperature, it behaves like a 50-weight, which is plenty thick for just about any street car, even too thick for many. ~Erik~ Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted November 22, 2007 Share Posted November 22, 2007 Have run 20W50 but not 5W50. The problem with trying to compare various viscosity oils even of the same brand is that the additive (antiwear, etc) packs/quantities might be different. Higher viscosity oils naturally have a higher HT/HS high temp/high shear which can give better wear values. I think some people specifically looking for 5W50 run Agip. Shell helix ultra might also have something in that vis range. I'm always wondering if hi vis spread oils use a lot of viscosity index improvers VII's to make it happen. I pasted the values in excel so it would be tabular for easier viewing. I assume these are ppm: Quote Link to comment Share on other sites More sharing options...
Towel Rail Posted November 22, 2007 Share Posted November 22, 2007 5W40 and 5W50 oils, for the most part, use Group III/IV basestocks, so they need some, but not a lot of VIIs. The Castrol 5W50 is more like a "strong" 5W40, just 0.1 cSt over the line. Kind of a poseur, lol. I think those wear numbers are in percentages. PPM would be somethng like 26 for Iron, 19 for Copper, etc. Quote Link to comment Share on other sites More sharing options...
Setright Posted November 25, 2007 Share Posted November 25, 2007 I've run Mobil 1 5W-50 in over 120k kms in a LEgacy 2.2, and thousands more in my 2.0 Impreza. Good oil, never had any ill effects. Of course, I do usually run 0W-40 in winter. Live in Denmark remember Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted November 25, 2007 Share Posted November 25, 2007 I plan to continue using Shell Rotella 5-40 in my WRX in summer and 5-30 in winter. Both synthetic. So far, I stick with 5-30 in the wifes 3.0 OBW. I would probably switch to 5-40 if it began using oil from wear, but it is still young in mileage. this of course is in Texas. interesting to see the 5-50 development. Could be helpful for some folks I suspect. Carl Quote Link to comment Share on other sites More sharing options...
Setright Posted November 26, 2007 Share Posted November 26, 2007 Bein' in Texas, I'd recommend y'all to use the 5W-50 - aren't your summers hot ? Quote Link to comment Share on other sites More sharing options...
rverdoold Posted November 26, 2007 Author Share Posted November 26, 2007 Bein' in Texas, I'd recommend y'all to use the 5W-50 - aren't your summers hot ? To me it looked like an ideal oil for both winter and summer (mild Dutch winters though not getting much moren than -15C) Quote Link to comment Share on other sites More sharing options...
Setright Posted November 26, 2007 Share Posted November 26, 2007 Sure, but even Mobil's own 5W-40 is better suited for freezing weather. It's thinner in the cold than 5W-50. I always like to remind that the xW-xx is just a consumer label that covers a range of viscosity. To be serious about oil choices, you must look at the tech. data sheets. European Shell Ultra 5W-40, for example is so thin that it is almost a 5W-30 oil. Mobil Delvac 1 5W-40 is close to being a 5W-50 ... Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted November 27, 2007 Share Posted November 27, 2007 I'm reluctant to give up the '5' side of the viscosity spectrum, especially in the 06 with warranty - but I could probably run 10-30 in winter and 10-40 in summer in both my vehicles to good effect. Maybe 10-40 after 100K miles of wear all year round. I dunno Carl Quote Link to comment Share on other sites More sharing options...
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