Then there's the time I thought it would be a good idea to put Slick 50 in my '91 ZX6...![]()

Yes and no. For years, Honda cars with manual transmissions have used and call for regular motor oil. (The clutch is still dry, of course.) When I had a 5 speed Accord, and since the change interval wasn't all that often, I used motorcycle specific full synthetic motor oil in the transmission. 10/40. After 125,000 miles it still shifted like new.
There may be other small car manual transmissions out there that use motor oil, but I'm not sure.
Mobil 1
15W-50
API - SM,SL,SJ,CF
suitable for use in high-performance turbo-charged, supercharged gasoline and diesel multi-valve fuel injected engines
...certainly not obsolete by API standards. but, you do have a dry clutch.
The Mobil 1 15w50 does not contain friction modifiers (it's not energy conserving) so it's one of my choices.
As you've stated, the fact that's it's synthetic isn't the problem. It's that "Energy Conserving" bit that is the culprit.
That's ok only if you put it in the oil filter, so it doesn't disperse to the tranmission.Then there's the time I thought it would be a good idea to put Slick 50 in my '91 ZX6...![]()

That's ok only if you put it in the oil filter, so it doesn't disperse to the tranmission.![]()

That reminds me I need to get a 710 cap for my bike.

means, yes, i understand. sheesh.
Sorry, I meant share the same lubricant at the same time. Your motorcycle motor oil is also the transmission oil. In cars, the systems are independent in terms of lubricants.
Oh....yea.....well....I'm a little old..ish...hurumph.....
Ah....this thread is degenerating nicely. As all oil threads should.

.Is it time for political arguing?
WHY DON'T YOU AGREE WITH ME? YOU MUST BE STUPID!!!!
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I change my oil all the time.
The (free from my sponsor) Repsol Synthetic 4t gets drained out of the 1000RR engine in the F1 sidecar into clean gallon water jugs through a coffee filter when I do the oil between each race...
...and yes you guessed it, goes right back into the Ducati, Sarah's GB500, and the Subaru.
Hell if I'm going to toss out perfectly good hardly used expensive-ass oil.![]()
