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, Tue, 26 Jun 2001 15:36:31
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I don't have any data and don't need any. I can tell what you need to find in order to compare heat transfer, though. In a nutshell, the only relevant property here (because thermal conductivity, heat capacity, etc. are virtually identical between conventional and synthetics) is viscosity. Here it is very dangerous to compare apples to oranges, because the synthetics will have a different viscosity at a given temperature than conventional oils, even if they are the same grade. Why? Because synthetics are less sensitive to temperature and shear rate than conventional oils. This is generally a desirable characteristic, but definitely not for heat transfer. The hotter the engine gets, the less viscous you want the oil to be for heat transfer purposes. Heat transfer rate is inversely proportional to viscosity raised to the 0.6 power.
I have seen postings about turbo cooling here that may mislead people, though. Doesn't matter what kind of oil you use, the quality of turbo cooling is determined BY THE COOLANT, NOT THE OIL. The only thing important here is that you allow the engine to run without boost after the turbo has been running hard for an extended period of time. Otherwise the remaining oil in the turbo will cook. If you are a lazy SOB and refuse to allow the turbo to cool, you are kidding yourself if you think you are better off with synthetic. The BASE OIL definitely has better oxidation/thermal breakdown resistance than conventional oil, but the critical additives will break down at the same rate.
, Tue, 26 Jun 2001 15:36:31
, Tue, 26 Jun 2001 23:05:08
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