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04-14-2014, 03:46 PM | #1 |
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Forester XT (2.0 DIT) - 5w-30 required, why not 0w-40 for track use under boost then?
I think the thread title is self explanatory.
FYI, I've read multiple threads regarding the oil weight for both track use and track use with FI applications. I am really surprised with the fact not so many people prefer 0w-40 weight oil for FI+track use especially since Subaru mandates 5w-30 for Forester XT DIT engines ( assuming not so many Forester will see track..) I don't remember anyone mentioned the required oil viscosity for the XT Forester http://www.cars101.com/subaru/mainte....html#forester In other words, if a street driven Forester XT uses 5w-30 for the same engine (FI application), don't you think 0w-40 would be more protective for track use (specifically under boost)?
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04-14-2014, 03:53 PM | #2 |
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http://www.ft86club.com/forums/showthread.php?p=1190674
according to this thread majority of the people use 0w-20!!! for those who use 0w-20 oils in their cars, did you take a look at the flashpoints of that specific brand engine oil? and I found out from a related thread that the service schedule shows that 0w-20 and 5w-30 can be used but 0w-20 is preferred ( probably for gas mileage)
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04-14-2014, 04:03 PM | #3 | ||
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04-14-2014, 04:29 PM | #4 |
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I understand the importance of the high quality synthetic oil I just want to understand why so many people( even when boosted) use good quality 0w-20 oil when Subaru mandates 5w-30 for their boosted engine.. all else equal (high quality oil) I would definitely prefer the 5w-30 as a bare minimum for FI..
at certain operating temp, it should provide better protection.. what's missing here? IIRC, all the Subaru engines (NA) come including Outback, impreza ..etc filled with 0w-20 from factory and I am pretty sure it's for the gas mileage, Thanks again
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04-14-2014, 04:33 PM | #5 | |
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The Following User Says Thank You to CSG David For This Useful Post: | glamcem (04-14-2014) |
04-14-2014, 05:49 PM | #6 | |
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I will most likely use 0w-40 Mobil 1 European formula as I did with my previous cars (prior to that I was using Shell Rotella T6 with no problem..on everything I owned...cars, bikes..etc) . Do you know the flashpoints of V300 (0w-20) ?
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04-14-2014, 06:08 PM | #7 | |
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04-14-2014, 06:24 PM | #8 |
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I will most likely attend couple events this weekend and try to get some logs with Torque App. My kit hasn't been installed yet so I will first try OEM cooler with Koyo first then upgrade if it becomes necessary,
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04-14-2014, 06:55 PM | #9 |
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On stock setup...you are kind of okay. The issue is added power...
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04-14-2014, 11:16 PM | #10 |
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Based on research, OEM heat exchangers are to aid in warming up oil and maintaining consistent temps. A real oil cooler would be the proper way to cool down oil temps.
I think Subaru skipped out on an OEM heat exchanger because... 1. 0w-20 is already pretty thin, therefore, a heat exchanger isn't necessary. 2. Heat exchanger won't really help in extreme track conditions. For a track car, I think a proper oil cooler would be needed. Why do you think the BRZ RA edition includes an OEM oil cooler? |
04-14-2014, 11:39 PM | #11 | ||
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The oil cooler is a common upgrade for the WRX/STi. |
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04-15-2014, 04:47 AM | #12 |
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I understand there are some differences but DIT engine also has stronger internals and oil cooler ( adequate or not) but still mandates higher weight oil.
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04-15-2014, 04:50 AM | #13 | |
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You're welcome to use a 0W40 oil in your engine if you like, but we make our decisions based on test data and evidence, and 0W20 is what goes into our engine. A higher weight oil doesn't equate to more protection. |
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04-15-2014, 11:57 AM | #14 | ||
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since they're both FA family engine made my Subaru and according to the specs FA20 ad FA20- DIT have a lot more in common compared to FB series.. Back to topic, are you suggesting a higher weight oil (made by same high quality manufacturer say for instance Motul 0w-20 vs 5w-30) doesn't equate more protection at certain temps especially under boost + hard driving? Again, I am not questioning the quality of the motor oils solely based on their viscosity but I just want to learn the logic behind using the bare minimum that is suggested/designed for a stock (or close to stock) car when adding 60-70% more hp with FI and more importantly when pushing it to the limits (HPDE-AutoX ..etc)..
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