Possibly, but I was schooled in MB oil pressure years ago that anything less than 1.0 bar at idle was undesirable or indicated excessive engine wear.
Dan Sent from my iPad > On Sep 19, 2016, at 4:05 PM, Meade Dillon via Mercedes > <mercedes@okiebenz.com> wrote: > > Dan, this line from your email caught my attention: > > On Mon, Sep 19, 2016 at 10:56 AM, Dan--- via Mercedes <mercedes@okiebenz.com >> wrote: > >> The only reason for using the higher viscosity oil is to keep idle >> pressures up in high temperatures. In both M119s with over 275k the idle >> pressure drops perilously close to 1.0 bar during the hottest times of the >> year with everything turned on. If I use the 15W-50 idle pressures are >> more like 1.5 bar under similar conditions. > My understanding after reading through the "Motor Oil University" material > on Bob is the Oil Guy ( https://bobistheoilguy.com/motor-oil-101/ ) is that > engine oil is serving two purposes, lubrication AND cooling, and in order > to cool it needs to flow, at the rate of flow that the MB engineers > calculated. Increasing the viscosity will slow down the flow (less > cooling). You may be using the wrong metric (hot idle oil pressure) to > guide your choice in oil. > > ------------- > Max > Charleston SC > _______________________________________ > 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
