Oil life vs temperature

[dnewton3]

Not much. Different Anti-oxidant types degrade at different rates. There too many variables to glean anything from this chart.

Agreed.
This chart tells us next to nothing of value ...
Are we to make our own assumptions about what base stock they might be referring to? (group II, III, IV, V) (how "pure" is the stock) (etc)
Are we to make our own assumptions about what additives they might be using? (the sky is the limit here ... additives are an industry within an industry)

This chart is useless to anyone who understands that the variables are so widely undefined that it's worthless marketing and nothing more.

 

[Jetronic]

Yes, haven't towing or track etc. always been considered "harsh conditions" ergo shorten OCI.

This chart is just generalizing, probably several high-end oils that fair better then standard group III oils.

Of course but the relatiuonship still is true: higher temps means faster degradation

 

[Jetronic]

The max oil life even IF you don't drive your car, is 1 year*!

Please Note:
This is based on a VERY complex equation the oil companies have came up with.

It's been a while and I just recall the first part of the equation:

$ = [# of suckers born / min + (Existing suckers) **n] x profit per quart ...

Back of my M1 EP 10W-30 jug:
"*Protects for 20,000 miles or one year, whichever comes first."

Doh, Alfa Romeo says 2 years or 22k miles, unless you do not enough miles (assumes short tripping I suppose, less than 6k miles annually)

 

[TomYoung]

I dont understand this chart. It is missing an actual time dimension. Maybe i'm not running on enough sleep overnight.

It’s there. The chart is indicating that the lower oil temperatures provide twice the life, which is a time metric. My suspicion, though, is that oil temperature degradation is not what necessitates oil changes. Nor is it wear. It’s the fact that the oil gets contaminated added to the add pack depletion.

 

[dnewton3]

Further, how are they measuring (defining) this half-life topic?

Back in the day, there was a similar common ATF mantra floating around. For every 10degF of operating temp the ATF would lose half its life. But that was based on the topic of viscosity only (and was not shown to have any correlation to wear protection). And these claims were based on the old Dexron IIIh and Mercon fluids. Once Dex VI came out, the vis retention was much improved (base stock improvements) which made the claim of "life loss" obsolete.

So I go back to my lead question in this post ... How are they defining a loss of fluid life? Are they looking at viscosity retention? And can they show that the loss equates in concert with a degradation of wear protection?

 

[Nesterenko]

Is there not a" sweet spot" on that chart?

 

[gfh77665]

I have seen several transmission fluid charts like that. Oil not so much.

 

[Samurai1225]

A chart of useless information as I see it.