Mobil 1 High Performance 15W-50 No Longer Made - What To Use?

Brett Dikeman brett at
Tue May 31 14:02:39 EDT 2005

On May 31, 2005, at 9:27 AM, Steven Hauptmann wrote:

> I have read the same thing in the manual. Remember though that with
> synthetic oils, it's the second number that indicates the base  
> stock. Ie, a
> 10W-30 uses a 30W as the base stock.

The second number isn't a "base stock", it's the weight of the oil at  
operating temperature, 100 degrees C.

Anyway, temperature ranges are extended for synthetics, so 30w  
synthetic should be fine for where 40w non-synthetic was stated.   
I've been using 10w30 for years as have been a lot of other folks I  
think, and...

...none of us are worse for wear.

[ducks, runs for cover]

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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