https://www.benzworld.org/forums/attachments/r129-sl-class/252613d1249347569-what-engine-oil-viscocity-you-running-2001_mbfactoryapprovedserviceproducts.pdf
I have some other graphics extracted from some of these posts in that thread --FT On 3/18/19 6:08 PM, OK Don via Mercedes wrote:
When the ambient temps are at and above 100F, a lighter than 50 weight oil would not keep the oil pressure up at idle when the engine was fully warmed up. 15W-50 synthetic was great in the OM61x and OM60x engines I had. So, if the temps get high, you need heavier oil. If the temps get low, you need lighter oil. If they swing to both extremes, you need multi-weight that covers both ends. On Mon, Mar 18, 2019 at 4:44 PM Curt Raymond via Mercedes < mercedes@okiebenz.com> wrote:In a 61x engine 0w40 is hard to keep IN the engine. At least it was in my '83 240D. That car leaked 5x as bad with 0w40. It started more easily but was costing me an extra quart of oil a week to keep going. 5w40 leaked way less and started nearly as well. I'd say 5w40 is the sweet spot, especially for older engines that see some cold. At anything above freezing 15w50 is probably fine and provides higher sheer strength. I don't think its any "better" because engine oil is most of the time "good enough" and doesn't benefit from being "better". Most of us don't run in real extreme conditions... -Curt On Monday, March 18, 2019, 5:11:34 PM EDT, Meade Dillon via Mercedes < mercedes@okiebenz.com> wrote: I think ya'll are wrong with this idea that thicker oil is better. Vast majority of engine wear normally happens immediately after a cold start. Thick oil makes this worse. Synthetic oil has far better flow characteristics (see Curt's test of M1 vs. Dino in his freezer from years ago) and helps in this case. Oil is not only a lubricant but also plays a very important roll in cooling the engine internals, and for cooling you want a high flow rate. Thinner oil will flow faster, provide better cooling. 0W-40 is the best of both worlds, for diesel. I use 0W-30 in SWMBO's Infiniti gasser motor. That is at over 250k miles and doesn't burn a drop. See Bob is the Oil Guy website, read up on the Oil 101 info. ------------- 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
-- --FT _______________________________________ 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
