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 > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > -- 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! _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
