Some oil thinking

Posted by Janicholson on October 18, 2005 at 13:16:01 from (199.17.6.175):

In Reply to: Brining a Famall M out of storage--Questions. posted by Blue3992 on October 17, 2005 at 16:01:10:

Multi weight oil.
10W-30 oil is a viscosity stabilized oil. This means that when compared to single wt. oils made in the forty's and fifties its viscosity stays more uniform in cold and hot.
At normal internal engine temperatures a 10-30 oil will remain the same "thickness" as a 30wt. At low temps the oil will not thicken any more than a 10wt.

This makes starting as easy as with a 10wt. and running under load in summer as safe as a 30wt.

The American Petroleum Institute (and other sites) have the specifics.
15-40 is thus as thin as 15wt when real cold, and as thick as 40 when operating.

The point is, there is no compromise in safety or effective lubrication at all with these oils.

Synthetic oils are even broader in viscosity stability. and provide appropriate advantage. In new or fresh rebuilds, I use synthetic beacuse engines don't wearout as fast with them in the crankcase. If an engine uses oil, or leaks it it is not a candidate for synthetic due to cost.
Hope I helped!
JimN

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