Winter oil ???

[MarkP]

Doesn't matter where you live. The operating temperature is the same.

You bring up a good point but I suspect all oils undergo similar changes. As for operating temp, it is a range. During the winter engine temp sits just above the thermostat operating point. During the summer it will move up but never 'boil' because 1) the cooling system is operating and 2) the system is under pressure.

I'm much more concerned about low temp performance during a Colorado winter than high temp shear changes. Pour points in the -30's F/C are close to low temps in Colorado. In general I suspect start-up oil starvation is much more of a problem than high temp shear.

It was 24F last night in my area. I know Denver broke the record low last night.

 

[rover4x4]

add ZDDP.

 

[flyfisher11]

Shoot! Quaker State.

 

[rover4x4]

Mobil 15w50 has the highest zinc levels in their synthetic line. Followed by the 10w40 and 0w40 oils.

 

[archaeology_student]

What about the 76 Lubricants PURE Synthetic 5w40?

It meets all the European specs (except the new VW 505.01 specification).

 

[Jupiter Rover]

Mobil 15w50 has the highest zinc levels in their synthetic line. Followed by the 10w40 and 0w40 oils.

The 15w50 is one of Mobil's best consumer oils.

 

[gmookher]

I can see how in florida that may make sense but up here in seattle 15w50 is too thick for the rover. its 42 degrees as a low here..back in dino only days thicker oils offered more protection, today thats not true, I feel very well protected at 5w-40, its a3b3, more important than weight or zinc content alone

 

[Jupiter Rover]

I can see how in florida that may make sense but up here in seattle 15w50 is too thick for the rover. its 42 degrees as a low here..back in dino only days thicker oils offered more protection, today thats not true, I feel very well protected at 5w-40, its a3b3, more important than weight or zinc content alone

5w40 or 5w50 is the best of both worlds. Good start up protection plus good operating temperature protection. And the 5w40's don't sheer as bad as 0w40's.

 

[jymmiejamz]

But in all reality, you shouldn't even drive until the engine/oil reaches operating temperature... It causes wear and most wear happens every time you start the engine.

So are you advocating letting the car idle until it reaches operating temp?

 

[Jupiter Rover]

So are you advocating letting the car idle until it reaches operating temp?

ehh. I just wouldn't put high rpms for the first minute or two. The oil heats up pretty fast, but for the first 20 seconds or so its still relatively cold. Some people hit the gas as soon as they turn on the engine, theoretically that is a no-no for any car or engine.

 

[MarkP]

Keep in mind Mobil 0w40 sheers to a 0w30 under a 1000 miles. Besides that its goodstuff.

The above had me wondering if this wasn't related to Castrol that tried to classify non-syn as syn.

From a MB thread - Is Mobil 1 truly synthetic?

which refernences Bob's the oil guy European and Import Motor Oils

M1 0W-40 is Poly-Alpha-Olefin based product and per the above thread is a "true GpIV synthetic product".

Not sure about Castrol. Your shear observation may hold true for Castrol's definition of synthetic.

 

[Jupiter Rover]

The above had me wondering if this wasn't related to Castrol that tried to classify non-syn as syn.

From a MB thread - Is Mobil 1 truly synthetic?

which refernences Bob's the oil guy European and Import Motor Oils

M1 0W-40 is Poly-Alpha-Olefin based product and per the above thread is a "true GpIV synthetic product".

Not sure about Castrol. Your shear observation may hold true for Castrol's definition of synthetic.

Sorry I didn't clarify, not all 0w40s sheer. But Mobil 1 0w40 definitely sheers to a 0w30 very quickly. I also think there is some truth that a 0w40 will sheer faster than a 5w40 if they are of the same base stocks and additive packages.

Almost positive that M1 does not have one oil that is 100% synthetic. Only a rare few oil companies do this, Red Line for one. M1 0w40 has a higher than normal amount of PAO but it is not 100% PAO. There is definitely some group III base stock in that oil. If my memory is correct M1 0w40 is suggested to have around 40% PAO.

 

[MarkP]

....Almost positive that M1 does not have one oil that is 100% synthetic......

It does require some detective work

FYI - from VWvortex ForumsOil and Lubrication LL-01 Specification & Group IV [Archived]

Mobile 1 0W-40 is LL-01 which implies Group IV PAO

Castrol newer european oil is LL-01 but I don't think the US stock is.


Products that meet MB 229.5 and BMW LL-01 specs are based on different stock and probably have different sheer characteristics than the issue you raise.