Thank you very much!!
Probably has good size heat exchanger so they manage to have both in similar range. Probably done more so to speed up oil temperature warming than than to keep it cool, though if big, it will keep oil temperature in check unless some heavy towing or track (well on another vehicle).
I think you need to define "much" as part of "much slower", as both our HEMI's have oil-to-coolant heat exchangers and oil temp, while lagging coolant temp, doesn't lag it by much.
Yeah it does have a heat exchanger. I watch the oil temp in the winter because the coolant temp gauge doesn’t have a value on it. In the winter below 20F the it hardly reaches operating temp no matter how long it’s driven, below 15F I don’t think I’ve seen higher than 170F oil temp. I’ve had the dealer look into it because when we hit below 0F temps it struggles to even defrost.
If everything is OK, that means they are keeping oil temperature too low to mitigate potentially other issues. BMW did that on N63 engines at one point. Because of hot V design, they had issues with turbo feeding lines etc. and valve stems. Usually BMW’s run oil temperature 240-250f but in the engine they lowered it to 190f to try to prolong life of those lines (I guess beyond warranty).
True. It will lag. How much is up to tricks manufacturers use. Larger heat exchanger, faster warm up.
Yeah, we have 7 quart sumps, so pretty large, but I get the impression the heat exchangers are pretty good, as they seem to do an excellent job keeping oil around coolant temp, even when towing.
So, on my BMW it is 7.5qt (with cooler), manual, light vehicle. So oil temperature will lag after coolant.
Could someone estimate the time between startup & simply driving slowly to reach operating temps for the oil; after one knows the coolant has gotten to operating temps?
The figure I've seen is that ZDDP additives are activated around 140f so they are working before the oil has reached full operating temps. Oil temps do lag behind coolant temps in most engines, though, so you're not being unreasonable in your thinking.
I'd say - a reasonable expectation.
That’s when a piece of cardboard in front of the radiator comes in very handy. Used to run a piece in front of my radiator on my Dodge when I lived in Montana.
I have a 24 F150 with a 3.5 twin turbo
This video I watched the other day, "...Oil Dilution Due to Petrol" is not very exciting, but at 15:21, which has a chapter marking, he started the test to see how long the coolant and oil took to reach certain benchmarks. Here's a screenshot of their results. The time for the oil to come up to temperature was much longer in his testing compared to what I believe most people think.
This is absolutely true. Nissan VQ's have a donut on the filter that pulls coolant immediately on engine entry from the water pump - so bottom of rad coolant is like 160F even on hot day. Lots of test data in that world shows the oil temperature stays pretty low - even under harsh duty like long, slow climbs off road or Z car track days. What BMW does might be completely different. At minimum the size of the sump and its location will have some affect.
Toyota Dynamic Force which is likely one of the most common engines sold today has no oil cooler - except in a a few variants that have higher rated tow capacity - like Rav4 TRD/Adventure/Limited. Mine has no engine oil cooler.
From Dave Barry, regarding the tendency of small-business owners to insert quotation marks for emphasis, with unintended results:
Japanese engineering trends can be quite different from German, and American engineering trends.
Ok, that’s helpful data for this vehicle, but I have more questions than answers after watching the video. For one, does the test vehicle; a 2020 Honda HRV 1.5 Turbo, have an oil cooler that could delay its time to reach operating temperature?
That engine was not available in the US market for the HRV.
