<VV> Mobil 1 Motor Oils

[Dale Dewald]

At 01:06 1/05/2012 -0500, J R Read wrote:

 >>snip<<

>Oh... my goal is to be able to decide if Mobil 1 10W30 with appropriate
>amount of STP added will satisfy the ZDDP of 1200 ppm AND provide an
>appropriate viscosity level for Corvair engines within the temp ranges we
>deal with.  I'd ask the racer guys, but I don't think that they are looking
>for the engine longevity that most of us would like.
>
>I'm currently using 15/50 Mobile 1, but sometimes (not often) start and
>drive in cold weather - so wonder if I'm doing damage (on those occasions)
>which could be avoided by a change in what I put into the crankcase.

Hello JR,

About 2 weeks ago I again checked the various formulations of Mobil 1 on 
the shelves at my local Wal-Mart.  Mobil 1 High Mileage was still available 
in 5W-30, 10W-30 and 10W-40.  Both the 5W-30 and 10W-30 weights carried 
only the API service rating SL/CF.  However the 10W-40 was rated SN, SM, 
SL/CF. None had the "Energy Saving" starburst symbol. The label description 
stated that these oils contain extra anti-wear additives (ZDDP) and seal 
conditioners for older and 75k+ mile engines.  ExxomMobil's product data sheet:

http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf

lists all of the High Mileage oils as having 1000ppm P and 1100ppm Zn.  I 
think this would be adequate for a properly broken-in, stable running 
Corvair engine in normal service conditions.

Last fall I picked up a couple of 5 quart bottles of the 10W-30 when it was 
"rollback" priced at $23.88 each.

Dale Dewald
Hancock, MI