[QUOTE=thayer;3204925]Oil thread.

The 20w50 will increase general oil pressure. The pump is working harder to move the thicker oil. It will take longer to heat up the oil to operating temp which is the only time the oil is actually sufficiently lubricating the engine.
[QUOTE]

When cold the 20w50 is 20 weight which lubes very well for lower engine temp at start up. When the engine heats up the oil gets to 50 weight, thus 20w50 name.

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K