Originally Posted by
A62TURBO
If you're driving a turbo car, only use 5w30 because 10w30 is too thick at startup which starves the turbos and 0w40 is too thin at normal temp which is killer on the turbos bearings.
ko3's dont have bearings and 0w40 is not too thin at opperating temp its thicker than 5w30. Oil weight, or viscosity, refers to how thick or thin the oil is. The temperature requirements set for oil by the Society of Automotive Engineers (SAE) is 0 degrees F (low) and 210 degrees F (high).
Oils meeting the SAE's low temperature requirements have a "W" after the viscosity rating (example: 10W), and oils that meet the high ratings have no letter (example SAE 30). An oil is rated for viscosity by heating it to a specified temperature, and then allowing it to flow out of a specifically sized hole. Its viscosity rating is determined by the length of time it takes to flow out of the hole. If it flows quickly, it gets a low rating. If it flows slowly, it gets a high rating.
Hope this helps. i also found this,
Mobil 1 0W-40 meets key industry and car builder specifications for:
Mercedes MB 229.5
BMW Longlife 01
Porsche Approval List 2002
VW 502.00/505.00/503.01
GM-LL-A-025 (gasoline)
GM-LL-B-025 (diesel)
ACEA A3, B3/B4
API SM/CF
Mobil 1 0W-40 provides the widest range of protection -- providing the extreme cold start protection of an 0W grade and the high temperature protection of an SAE 40 grade.
oh btw i use 0w40 in all 3 of my audis.
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