I thought what you were saying was that the diff' between Hot 15w-40
& Hot 10w-40 was giving you a 10PSI drop at speed ~ Theoretically,

because they are both 40s they should produce the same results ~ you
are correct that you have to put something in there so if you try them
all

& they all vary then you use the one that varies the least ~ but
bottom line is I think I misread what you were trying to say.

                                                                        ORR ~ DeanB
On 14 Mar , 2013, at 2:58 PM, Don Hanson wrote:

>
>
> On Thu, Mar 14, 2013 at 9:11 AM, OlRivrRat <OlRivrRat@comcast.net>
> wrote:
>         If I saw a 10PSI drop or even a 5PSI drop in HotOP from
> 15w-40 to 10w-40 or even 0w-40 I would Kiss that OilManufacture
> Goodby in a HeartBeat.
>
>
>
>   Really?
>
>    With almost ever car or motorcycle I have ever owned and all the
> brands of oil,  I recall at least 10-15psi less oil pressure after
> the vehicle and the oil get hot....I gotta put something in there, I
> couldn't just kiss every oil manufacture goodbye....Just sayin...
>    Not every car and bike I have owned was a beater, I even bought
> brand new several few times, though I probably won't be doing that
> again as a wage worker.    I've also used synthetic oil exclusively
> in some of my motors....that, too seems to get less viscous as the
> temperature climbs to 180f...
>    D. Hanson
>
>
>
>