Wait, we're (or at least I'm) being specific here though, was it a modern
synthetic oil? Specifically are we comparing 5w40 vs 15w50?
Its easy to say light oil won't do whatever but I'm specifically saying in most
conditions you probably won't see any difference using M1 5w40 vs M1 15w50 in
anything but the most extreme cases...
Of course it doesn't really get hot (or cold) enough where I live to really be
extreme most of the time...
-Curt
On Monday, March 18, 2019, 8:04:19 PM EDT, OK Don via Mercedes
<mercedes@okiebenz.com> wrote:
It's enough that a thinner oil couldn't be kept cool enough by the oil
cooler to keep the idle pressure above .3 bar in the OM615 we had - '70
220D, and was marginal in the '76 300D.
On Mon, Mar 18, 2019 at 6:27 PM Curt Raymond via Mercedes <
mercedes@okiebenz.com> wrote:
> Will it be a big difference though? 5%, 10%? At what point does that mean
> you *need* thicker oil?
> Also remembering that most of us don't run the engine at 100% output very
> much, with a 240D you come close but still not all the time. For example
> when I'm running the groomer it works 100% all the time and I have to vary
> the load to keep moving, fortunately its cold out so its relatively easy
> keeping the engine cool.
> As people usually point out oils today are waaaay better than what was
> available when the cars were new, M1 5w40 gives more protection against
> high temps than dino 20w50 which was "good enough" for years and years.
> Its also worth mentioning that M1 15w50 was only CF (I think) rated and
> today carries no certification (or didn't last I knew) because Mobil didn't
> want an old cert on their oil. Turbo Diesel Truck is (again my memory is
> soft) CI-4 (or better) rated...
>
> -Curt
>
> On Monday, March 18, 2019, 7:20:46 PM EDT, Craig via Mercedes <
> mercedes@okiebenz.com> wrote:
>
> On Mon, 18 Mar 2019 17:22:06 -0500 "Kaleb C. Striplin via Mercedes"
> <mercedes@okiebenz.com> wrote:
>
> > I agree. The inside of your engine is going to be way more hot than the
> > outside temp so the theory of needing thicker oil in hotter temps is
> > false.
>
> I disagree.
>
> That's like saying a W123 diesel doesn't need an oil cooler when it's
> cold outside, so it doesn't need an oil cooler (which the Benz engineers
> have included in the car).
>
> Your oil's temperature will be higher the hotter the ambient temperature.
>
>
> Craig
>
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--
OK Don
*“Travel is fatal to prejudice, bigotry and narrow-mindedness, and many of
our people need it sorely on these accounts.”* – Mark Twain
"There are three kinds of men: The ones that learns by reading. The few who
learn by observation. The rest of them have to pee on the electric fence
for themselves."
WILL ROGERS, *The Manly Wisdom of Will Rogers*
2013 F150, 18 mpg
2017 Subaru Legacy, 30 mpg
1957 C182A, 12 mpg - but at 150 mph!
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