it would be a "PAIN IN THE NECCCCCCCK"!
I am not aware of anything to the contrary. While elements can be harmless all by themselves, e.g. NA (sodium) and OH ( hydroxide) combining them will produce lye, which can kill if ingested, I can't see that being the case with oil. If anything, combining the 2 in a vehicle would enable it to flow more easily and be less subject to extreme temperature conditions. I live in NY, and park my car outside, where there winter temperatures can be brutal. Therefore, I use synthetic oil exclusively. Yes it's expensive relative to conventional motor oil, but the oil doesn't have to be changed as often. The only viable reasons I can see for mixing them, is the unavailability of sufficient quantities of either, or it's the cost.
Same to you and everyone else here!
Which one is yours?
"Engrish".
Yes. Too much of ingesting anything can kill you, even drinking water.
Itdependsonwhat'sfordinnerandwhoismakingit.
"Is Santa Claus real?"
No.
Neither. "It's like comparing apples to oranges."