Castrol EDGE EP 20K Synthetic Oil Users ?
- Thread starter ChrisD46
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I wouldn't worry about either of those even here in the frozen north. Both have been proven to be inadequate indicators of cold-weather performance.
Thanks… I do not worry. But does these tests indicate the quality of oil in any way?
Sure. You can't achieve extremely low pour points using a Group I, II or III base stocks even with pour point depressants, and wax crystals aren't desirable for many reasons. But for me at least what the approval gives is sufficient for my determinations. Wax crystal formation is directly related to pumpability and the winter rating.
Is cloud point even used these days? We used to perform the test in college but isn't the gelation index used now?
The winter rating? at 104 F
What? My comments were about the pour point relevant to your question about being in Southern California. Not sure what you're asking here.
Well… My thought is how a oil reacts at low temperature (below the xW rating) can be just as important as the HTHS above the 100 C rating.
Again… Just a conversation. Everyone has a different view.
OVERKILL
$100 Site Donor 2021
Because oil performance is generally unpredictable below the Winter rating (so, for a 0w-xx, that's -40C), the recommendation is always to use an oil appropriate for the anticipated ambient conditions. That means if you are going to see -30C, don't use a 15w-xx, which is only tested to pump at -25C.
In reality you do not want to go any where close to the pour point. Can I throw some of my un-educated bias into the conversation? Oil is always too thick on a cold start engine.
Too thick for what? Cranking and fuel-efficient pumping yes. But the MOFT is high and that’s one of the reasons why the old “most wear occurs at startup” isn’t true.
OVERKILL
$100 Site Donor 2021
Pour point was abandoned as part of the winter rating for precisely the reason that it failed to properly capture the oil's performance at low temperatures. This is why it was replaced by CCS and MRV, as, Quaker State famously had to pay out for engine replacements due to wax crystal formation in oils that should have worked fine according to pour point.
Pour Point's main usefulness at this point is to give a hint at the base oils used in a final product. Even if it fails CCS to get a low Winter rating (CCS is the easiest to fail) an oil with a good slug of PAO will have a very low pour point.
OVERKILL
$100 Site Donor 2021
CCS is tested 5C higher than MRV.
CCS stands for Cold Cranking Simulator and the idea is to measure the drag imposed in the test, to simulate the impact it will have on cranking speed. This is a more sensitive test than MRV (pumping) and is almost universally the one that gets failed first, thus determining the Winter rating.
Like MRV, the test is measured in cP (not RPM).
These are the limits:
OVERKILL
$100 Site Donor 2021
Yep, which is quite good.
The SN version of M1 AFE 0w-20 was 4,182cP:
http://www.pqiadata.org/Mobil1_0W20_dexos.html
Why not just use regular black bottle Edge for 6k oci's? You're not gaining anything with EP in this case except a lighter wallet.
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No, it’s the one where Amsoil and Castrol are placed in containers, frozen to -50 (I think), and then poured at the same time. Then the Castrol doesn’t move and the guy puts a screw driver in it - it stands straight up in the oil - and he says...we’ve got a schtick in the mud.
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True. I've actually been debating switching to the Castrol Magnetec, with engine getting to be older now. But each time I pick up the GOLD
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