<VV> Diesel Oil in Corvair

[Mark Durham]

I agree, considering the cost of the ZDDP additive package is $9.95,
an extra few bucks to get the oil with the additive in it is
worthwhile.  Mark Durham

On Thu, Mar 10, 2011 at 8:43 PM, Dale Dewald <dkdewald at pasty.net> wrote:
> At 17:59 3/10/2011 -0500, J R Read wrote:
>
>  >>snip<<
>
>>What I was trying to get at was the ZDP levels in various Mobil 1 products.
>>The 15w50 is 1200ppmPhosphorus and 1300ppm Zinc and is recommended for flat
>>tappet applications.  The "Turbo Diesel Truck" version is 1100ppm
>>Phosphorous and 1200ppm Zinc.  This is the one I have been using but have
>>recently found it hard to find.
>
> The P and Zn levels in the Mobile 1 "TDT" 5W-40 should still be adequate
> for a properly broken-in, well maintained engine.  If you can still find
> this formulation, I see no reason not to continue using it.
>
>>This caused me to re-think about whether or not I should even be using an
>>oil indicated for diesel engines at all.  The viscosity level of the
>>"diesel" version is closer to the 10w30 I would like to be using than the
>>15w50, so that is another consideration.
>
> To my mind the viscosity issue is more significant than the enhanced
> additive package found in a diesel rated oil.  For the most part gasoline
> engines do not need as much of these additives to meet the service life of
> the oil, so it is somewhat a case of overkill.  I have never found a diesel
> rated oil that does not also have an API S-rating for use in gasoline
> engines. However, most of the oils sold for use in gasoline engines do not
> have an API rating for use in diesel engines.
>
>>So, my question is...  are there harmful effects to a gas engine when using
>>"diesel" oil?
>
> As far as your gas engine is concerned, no. However, there might be some
> minor harm to your pocketbook for higher price of the diesel rated oil.  I
> believe that the extra price is well justified if the diesel oil you
> purchase contains sufficient P and Zn.
>
> Dale Dewald
> Hancock, MI
>
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