Does anyone other than Castrol make an oil suitable for extended drains between 9.0 - 10.0 cSt @ 100*C?
Extended Drain 9.0 cSt - 10.0 cSt @ 100*C
- Thread starter Gene K
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Gene, need to be a bit more specific. How do you define extended drain? Why that specific of a viscosity?
M1/Amsoil/RL etc xw-20 wt oils are capable of extended drains, as are some others.. M1 and Amsoil are both coming out with a 15,000 mile and 25,000 mile 5w-20/0w-20 oil.
I just switched my car over to Amsoil ASL 5w30 which is 10.5 cSt@100C. Car runs great on it.
M1/Amsoil/RL etc xw-20 wt oils are capable of extended drains, as are some others.. M1 and Amsoil are both coming out with a 15,000 mile and 25,000 mile 5w-20/0w-20 oil.
I just switched my car over to Amsoil ASL 5w30 which is 10.5 cSt@100C. Car runs great on it.
I think Redline 5W-20 is 9.1 cSt. Thats the only thing other than Castrol Syntec 5W-20 (9.0) and 5w30 (9.7) I have been able to find.
Why the obsession with 9.0 - 10.0 cSt @ 100°C? Why not 8.5 - 9.5 cSt @ 100°C? And what about HTHS?
The engine in question seems to show the least wear with oils of 8.8 cSt and 10.3 cSt. There is also a oil UOA of 9.1 cSt that may look even better but its only one. This to me means I should start the search for the "perfect oil" at around 9.5 cSt.
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Elf Evolution 0w-30...
Actually the latest Castrol Syntec 5w30 SM/GF-4 Product Data Sheet I can find list it at 9.7 cSt.
How did you constrain the other variables so that could be considered a valid conclusion?
I didnt thats why I said "seems". However you have to start somewhere.
8.46 cSt - Pennzoil Platinum 5W-20
8.5 cSt - Amsoil XLM 5W-20
8.8 cSt - Motorcraft 5W-20 (Current)
9.0 cSt - Castrol Syntec 5W-20
9.1 cSt - Redline 5W-20
9.7 cSt - Castrol Syntec 5w30
10.3 cSt - Pennzoil Platinum 5w30
10.5 cSt - Amsoil XLF 5w30
10.6 cSt - Amsoil ASL 5w30
You need to start with the same formula (basestocks and add pack), or at least as close as possible, then vary the viscosity over a range under as identical conditions as possible (i.e., constraining the other varibles) before you could come up with any statistically valid conclusions that you've found the "best" viscosity range.
Currently there are enough UOAs with various 5w20s to show this viscosity works well in a wide variety of operating conditions. It seems obvious to me the next step would to be to find the best formula within this viscosity range to achieve your goal.
I dont think I have the resources to do a valid test.
However this might be interesting:
1. Castrol Syntec 5W-20 vs 5w30
2. PP 5W-20 vs 5w30
3. Amsoil XLM vs XLF
To be honest the engine would likely last 250,000 mi with 5000 mi changes with whatever
5W-20 to 20W-50 Dino that happened to be on sale that week.
However this might be interesting:
1. Castrol Syntec 5W-20 vs 5w30
2. PP 5W-20 vs 5w30
3. Amsoil XLM vs XLF
To be honest the engine would likely last 250,000 mi with 5000 mi changes with whatever
5W-20 to 20W-50 Dino that happened to be on sale that week.
Except for the rare times it gets below 5°F, probably.
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