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Mobil 1 0w30 report (long)
In message <199802050038.QAA03711@odf> luis@odf.UCSD.EDU (Luis Patino) writes:
> With the previous oils (Amsoil 2000, Castrol Syntec) oil temps
> used to stay to around 130 C while cruising at 80 MPH
> (130 km/h), and once got to 150 C while driving in the hot
> desert near Las Vegas. However, with Mobil 1 0w30, the cruising
> temp stays steady at one notch below 100 and even going uphill
> at 90 MPH the oil temp stays at the 100 mark.
130 degrees is about right for sustained cruising. 100 is _way_ too low.
As well as being below the design temperature, 100 is not enough to remove
some of the nasties that gradually blow/seep past the rings. Such nasties
include even water, as a combustion product. Getting the oil up to design
temperature helps evaporate these through the breather system.
Committee Member, UK Audi [ur-]quattro Owners Club