Real 30wt vs analog 30wt.

[farrarfan1]

In this thread jldcol gave a fascinating explanation of the differences between real 30wt's and analog 30wt's. I would like to see further discussion please.

https://bobistheoilguy.com/forums/threads/syn-thinner-than-dino-5w30-or-10w30.101345/

 

[Zaedock]

Oh great. I thought it was over. I was disappointed to learn that all the 10W30 in my stash is actually a 20wt.

Yum.

 

[Gary Allan]

It's simple. The only true 30 weight is SAE 30. If that happens to have a broad enough VI, it may also be a 10w30.

Otherwise everything else "appears" like a 30 weight @ 100C and reacts like their "W" designation at the specified temperature.

So ..I'd say that they're "virtual" 30 grades.

 

[Zaedock]

In all fairness, I want to add that some of what the guy said was true in regard to dino base oils requiring VII's. That doesn't make it any less "real" to me though. It certainly doesn't support that syn is thicker than dino or produces lower wear numbers.

 

[BuickGN]

Originally Posted By: Zaedock
In all fairness, I want to add that some of what the guy said was true in regard to dino base oils requiring VII's. That doesn't make it any less "real" to me though. It certainly doesn't support that syn is thicker than dino or produces lower wear numbers.



But as he pointed out in the other thread, the base oil in the dino 10w30 will be lighter than a synthetic VII-less base oil.

 

[Zaedock]

Originally Posted By: BuickGN
Originally Posted By: Zaedock
In all fairness, I want to add that some of what the guy said was true in regard to dino base oils requiring VII's. That doesn't make it any less "real" to me though. It certainly doesn't support that syn is thicker than dino or produces lower wear numbers.



But as he pointed out in the other thread, the base oil in the dino 10w30 will be lighter than a synthetic VII-less base oil.


That's true (as I indicated in that thread). But what does it have to do with the viscosity of the final product? He's using this logic to determine that all synthetic is thicker than all dino in a like weight. That's not the case.

 

[BuickGN]

Originally Posted By: Zaedock
Originally Posted By: BuickGN
Originally Posted By: Zaedock
In all fairness, I want to add that some of what the guy said was true in regard to dino base oils requiring VII's. That doesn't make it any less "real" to me though. It certainly doesn't support that syn is thicker than dino or produces lower wear numbers.



But as he pointed out in the other thread, the base oil in the dino 10w30 will be lighter than a synthetic VII-less base oil.


That's true (as I indicated in that thread). But what does it have to do with the viscosity of the final product? He's using this logic to determine that all synthetic is thicker than all dino in a like weight. That's not the case.


The viscosity of the final product may be the same but in a straight weight synthetic there are no VIIs to shear down to the base oil weight which is much thinner in a dino.

 

[BuickGN]

LOL at covering two similar threads at the same time. I can't keep up.

 

[Zaedock]

Originally Posted By: BuickGN

The viscosity of the final product may be the same but in a straight weight synthetic there are no VIIs to shear down to the base oil weight which is much thinner in a dino.


YES! HOORAH! The final product is the same! Depending on the manufacturer, the dino could be thicker! Tell that to this guy. I'm not arguing the fact that dino multi weights use a thin base and VII's. The OP in the other thread wanted to know if SYN is thinner than DINO (NOT THE BASE OIL!!!

).

 

[jldcol]

I would say at temps below operating temp the syn is thicker than dino, and most of the time these are the actual operating temps as most people use short trips so oil never fully warm up. Yes, when all vii's shear out a 10w30 will revert to base oil visc about 20wt. until thermal and other effect start to thicken it up. Syn oil has a viscosity index higher than dino so it will change less over temp range it's used in. My point was that dino oils use a very thin base oil that's props up by adds to act like a thicker oil, but it's really not and thus a analog of it, virtual seems imaganary, and the oil is real just less than expected especially when add run out.

 

[Gary Allan]

How about "apparent" if there's some nit to pick.

Plot two oils over various temps between 40C and 100C and see what you get. Choose a 30 grade of both dino and synth that are real close at the 100C visc.

Do it HERE Post your results that bolster your assertion.