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
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