Research UOAI believe this assumption, is as solid as the OP's assumption, as to why he chose to go with a 5w30.. Unless you could elaborate a bit more, instead of stating it as a fact.
Research UOAI believe this assumption, is as solid as the OP's assumption, as to why he chose to go with a 5w30.. Unless you could elaborate a bit more, instead of stating it as a fact.
Research UOA
I would use 0w40 in your Suburu without skipping a beat. These engines like 0w40
I never said the name of oil. Are some better than others yes but generally speaking. You seem to want an argument but not from me. I don't make blank statement like that only inform op that ,0w20 is probably the best oil for his Subaru since he didn't state 5w30 was allowed.So I take it that you have seen repeatable UOA's showing the use of Redline 5w30 in the FA24DIT is in fact, "worse", then the factory pour 0w20?
Also you stated that his Redline 5w30 will most likely sheer down to a 20 grade. So in other words he seemingly will be in spec, in regards to the owners manual, no?
If I was the OP unless I can see the UOA's you want me to research, your original statements would not suffice.
I personally would just keep using the recommended 0w20 unless I noticed oil related issues. But I am also not very familiar with the FA series engines.
All great points. Subaru still does have the same owner's manual language that a thicker viscosity is required in high temps, although they do not define the high temps nor the thicker viscosity. But there's not much uoa data out there on this new engine. You can find maybe 2 or 3 uoa's. Someone on the Outback forum did post a 0W-20 uoa from a new XT that dropped to a 16 grade but I think that's to be expected.The FA24DIT is a bored-out FA20DIT; I’ve not read and reports of a stroke change.
What none of us know is whether the BEARINGS and other components were changed to accommodate a lower viscosity rating. Does the OP know?
This engine is also in THREE new vehicles, including the Ascent, Legacy XT and Outback XT.
I would only run a more viscous oil based on objective reasoning, such as a TSB, OM addendum, bad UOA, reported failures, etc. I’m not concerned about a loud Subaru boxer sounding a little louder.
Not really. N/A Subaru's generally do fine on the recommended grade.I have a 2014 model year with the 2.5 (non-turbo) in it. Have always used the 0w20 oil recommended.
Is there a good reason now to change it to 5w30?
All great points. Subaru still does have the same owner's manual language that a thicker viscosity is required in high temps, although they do not define the high temps nor the thicker viscosity. But there's not much uoa data out there on this new engine. You can find maybe 2 or 3 uoa's. Someone on the Outback forum did post a 0W-20 uoa from a new XT that dropped to a 16 grade but I think that's to be expected.
The FA24DIT in the Ascent and new Outback/Legacy is supposed to be a more robust engine than the FA20DIT and Prime Motoring in NJ dropped an Ascent engine into a Crosstrek and is making 500+ whp on the stock block. The FA24 has thicker cylinder walls, more cylinder support molded into the casting, thicker rods, and stronger beehive valve springs (see video below). Can these components alone accommodate a lower grade oil? Not sure if bearing clearances have changed.
Back to the OP's question (or statement?). I don't think I'd be running a high SAPS oil in a Subaru DIT. If I used a high HTHS 5W-30, it would be Rotella T6 5W-30 MV, or an ACEA C3 oil, since those add packs would be a bit friendlier in regards to IVD and possible LSPI. There are lots of uoa's on the FA20DIT on nasioc where Resource Conserving 5W-30 showed low uoa wear metals using an oil with the operating viscosity of a 20 grade due to sheared and/or fuel diluted oil. Yes, there are a few posts about dealer serviced WRX's that had engine failure, but not at the level of the EJ's.
IAG Performance actually recommends reduced SAPS Motul X-clean in their built FA20DIT's. They only recommend Motul X-cess in their built EJ's.
Here's a video with some details of the FA24 where they also mention the Prime Motoring swapped Crosstrek.
Some quotes from Prime Motoring posted on nasioc (I think from PM's social media):
[Subaru] used the FA20 as a building block to learn and grow. Every weak or inefficient point on the FA20 has been improved upon.
The rods are still J shaped but way beefier
From what I can see so far, the future STI will be a great one. I was already a fan of the 2.0 but Subaru really improved on the weak areas. Also using FA24 cylinder heads and modifying them to work in an FA20 application. Only aftermarket part used was a set of ARP studs, everything else was new directly from Subaru. Goal of this is through trial and error, advance the FA platform further and give additional options to future customers. We will take it where no FA24 has been before and probably end up in many little pieces but this is the sacrifice we make for the future of Subaru performance
So then, the trend to ever decreasing viscosities is meant to reduce engine wear? I don't think so.
So I take it that you have seen repeatable UOA's showing the use of Redline 5w30 in the FA24DIT is in fact, "worse", then the factory pour 0w20?
Also you stated that his Redline 5w30 will most likely sheer down to a 20 grade. So in other words he seemingly will be in spec, in regards to the owners manual, no?
If I was the OP unless I can see the UOA's you want me to research, your original statements would not suffice.
I personally would just keep using the recommended 0w20 unless I noticed oil related issues. But I am also not very familiar with the FA series engines.
All great points. Subaru still does have the same owner's manual language that a thicker viscosity is required in high temps, although they do not define the high temps nor the thicker viscosity. But there's not much uoa data out there on this new engine. You can find maybe 2 or 3 uoa's. Someone on the Outback forum did post a 0W-20 uoa from a new XT that dropped to a 16 grade but I think that's to be expected.
The FA24DIT in the Ascent and new Outback/Legacy is supposed to be a more robust engine than the FA20DIT and Prime Motoring in NJ dropped an Ascent engine into a Crosstrek and is making 500+ whp on the stock block. The FA24 has thicker cylinder walls, more cylinder support molded into the casting, thicker rods, and stronger beehive valve springs (see video below). Can these components alone accommodate a lower grade oil? Not sure if bearing clearances have changed.
Back to the OP's question (or statement?). I don't think I'd be running a high SAPS oil in a Subaru DIT. If I used a high HTHS 5W-30, it would be Rotella T6 5W-30 MV, or an ACEA C3 oil, since those add packs would be a bit friendlier in regards to IVD and possible LSPI. There are lots of uoa's on the FA20DIT on nasioc where Resource Conserving 5W-30 showed low uoa wear metals using an oil with the operating viscosity of a 20 grade due to sheared and/or fuel diluted oil. Yes, there are a few posts about dealer serviced WRX's that had engine failure, but not at the level of the EJ's.
IAG Performance actually recommends reduced SAPS Motul X-clean in their built FA20DIT's. They only recommend Motul X-cess in their built EJ's.
Here's a video with some details of the FA24 where they also mention the Prime Motoring swapped Crosstrek.
Some quotes from Prime Motoring posted on nasioc (I think from PM's social media):
[Subaru] used the FA20 as a building block to learn and grow. Every weak or inefficient point on the FA20 has been improved upon.
The rods are still J shaped but way beefier
From what I can see so far, the future STI will be a great one. I was already a fan of the 2.0 but Subaru really improved on the weak areas. Also using FA24 cylinder heads and modifying them to work in an FA20 application. Only aftermarket part used was a set of ARP studs, everything else was new directly from Subaru. Goal of this is through trial and error, advance the FA platform further and give additional options to future customers. We will take it where no FA24 has been before and probably end up in many little pieces but this is the sacrifice we make for the future of Subaru performance
Yep it sure is!
I know, I know, there is a search button, been there done that.
Subaru can use all kinds of engine oils including 0w20 0w30 5w30 0w40 5w40, but 0W20 is recommended for the sake of fuel economy. According to the official website of Japan, 0w30 and 5w40 oils are recommended for users with long traffic jams and a large number of mountain roads and trailers.Yep it sure is!
I know, I know, there is a search button, been there done that.
I'll just start by saying I am a bit mystified as of why Subaru has suddenly changed oil types for their 2.4L Turbo engines for the Outbacks and Ascents. So, why the oil weight change for the 2.4L FA24DIT vs the FA20DIT in the older Forester XT? It's literally the same engine platform with a bore/stroke change. So is this just something to meet CAFE regs? At 750 miles I dumped the factory 0w20 oil and filled it with Red Line 5w30 and I have noticed the engine is noticeably quieter and seems overall smoother from it's cold starts, to running at highway speeds, to idling at stoplights. No noticeable loss of MPG or power. It seems like a lot of folks on the Subaru forms are all over the place with what their reasoning's are for this and what oil should really be ran in this engine. To me it just seems that these boxer engines are very "clattery" with 20wt oils.
So, stick with factory recommended oil or break the rules and run what should be ran in it?
Subaru can use all kinds of engine oils including 0w20 0w30 5w30 0w40 5w40, but 0W20 is recommended for the sake of fuel economy. According to the official website of Japan, 0w30 and 5w40 oils are recommended for users with long traffic jams and a large number of mountain roads and trailers.
Your user manual should have corresponding instructions on the use of engine oil, there will be a recommended viscosity and multiple applicable viscosities.I've never bothered to read on the Japanese site. I'll have to take a look, but it makes sense, at least for our turbo models to be using a bit more of a robust oil.