Quote:
Originally Posted by JMatt
The current 0W40 in our cars from the factory is PROBABLY the SM version. The SM classification came out November 2004. The first 2005 SRT-8's (not counting pilots) were built in February 2005.
0W40 had low levels of Zinc and Phosphorous to start with, even under the SL classification. They appear to have gone down another 10-15% under the SM classification.
Again - just like running a 200 thermostat instead of 180, or reformulating carnuaba waxes based on VOC content, or changing from freon to whatever we use now, the changes are for emissions purposes.
Even Mobil 1's own answer seems to imply that 5W40 turbo diesel oil is a pretty good choice for performance cars.......
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Gottcha! Thanks for the explanation. Is that oil as hard to find as the 0W40 is?