Why isn’t all lubricant oil the same in function?
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All lubricant oil *is* the same in function…to lubricate.
What’s different is the conditions under which it needs to do that, which drives you to different formulas (“recipes”) for different oils with the same basic function.
How hot & cold does it need to work? How long does it need to last? How much pressure will it be exposed to? What other chemicals or stuff might be mixed into it and how well does it have to work when that happens? Does it matter if it’s flammable? What other functions does it have to do, if any, beyond lubrication? How much can it cost? How much of it needs to be available, and how easy does it need to be to make? How bad is it if it breaks down?
The answers to all these questions between, say, a handheld power tool, a Formula 1 race car, a bulldozer, and a rocket are *wildly* different.
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