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Old 09-18-2013, 04:27 PM   #1
NMsubaru25
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Default Rotella T6 vs. RP 5w40

Ok so I know this may open a can of worms but first let me say I AM NOT trying to compare RP 5W30 to Rotella T6 (5w40), that subject has been beat to death more than chris brown and rhiana. There are no posts or threads on subarus and the RP 5w40. I know everyone likes T6 and I agree (I run it in one of my wrx's) but I am wondering how it compares to the 5w40 Royal Purple. Has anyone run it or tried it out? Its quite expensive in comparison to T6 but I have a few gallons lying around and am thinking about trying it out in my e85 16g wrx.

What are everyones thoughts?
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Old 09-18-2013, 04:39 PM   #2
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Almost all grades of RP have shown to break down fast. It's probably fine to use in our motors, but Rotella is cheaper, and has more zinc / phosphorus, and stays in grade longer.

Last edited by guroove; 09-18-2013 at 05:58 PM.
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Old 09-18-2013, 05:54 PM   #3
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I have never used it or seen any oil tests done on it. If you decide to run it send in a sample and have it tested, then post up your results.
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Old 09-18-2013, 06:03 PM   #4
NMsubaru25
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Sounds good, will do. I am very curious as to why it has been said that all RP oils break down faster in our engines. I know this is not the off road crowd but the 4x4ers are all about RP and they run the hell out of their engines also (most not turbo of course). Keep the comments coming!
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Old 09-18-2013, 08:43 PM   #5
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If it is laying around, use it. Either that or fry a turkey in it. Its not like that or ANY oil is going to magically explode your motor or restore lost compression....its oil....that's it....no and then.
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Old 09-18-2013, 08:52 PM   #6
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Quote:
Originally Posted by Unabomber View Post
If it is laying around, use it. Either that or fry a turkey in it. Its not like that or ANY oil is going to magically explode your motor or restore lost compression....its oil....that's it....no and then.
Dude, where's your car?
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Old 09-19-2013, 10:37 AM   #7
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I will give it a try on the next change and send off a sample to get tested so I can repost with some results and let everyone know how it fared. I can't believe no one has even tried it, seems common sense to me to compare a 5w40 to a 5w40 but I guess many use rotella (myself included) because its what so many others have used (bandwagon jumper )
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Old 09-19-2013, 11:08 AM   #8
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I think the main 2 things keeping people from using it are price and availability, which are the same reasons I haven't used redline or amsoil.
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Old 09-19-2013, 01:53 PM   #9
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I don't use it however I have a customer that does. He has no complaints.
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Old 09-19-2013, 02:02 PM   #10
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Well, what a lot of people here and other places don't realize is that subaru engines run a higher oil pressure which shears the oil more compared to other engines. It's the RP racing oil 5w40, 10w40 oil that holds up better overall. So, I would shoot for 3k miles to see how it did, make sure to check level twice a week if you are driving a decent amount. Use an OEM oil filter if you can.

The RP XPR oil I believe is the better grade in a subaru application any way.

But yeah, post your results so we can get some more info
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Old 09-19-2013, 06:57 PM   #11
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Quote:
Originally Posted by NMsubaru25 View Post
Ok so I know this may open a can of worms but first let me say I AM NOT trying to compare RP 5W30 to Rotella T6 (5w40), that subject has been beat to death more than chris brown and rhiana. There are no posts or threads on subarus and the RP 5w40. I know everyone likes T6 and I agree (I run it in one of my wrx's) but I am wondering how it compares to the 5w40 Royal Purple. Has anyone run it or tried it out? Its quite expensive in comparison to T6 but I have a few gallons lying around and am thinking about trying it out in my e85 16g wrx. What are everyones thoughts?
If you have some lying around, send a sample in for a voa. Go with oaitesting inc because they're much cheaper than Blackstone.

Is it API SM or SN and does it say it contains Synerlec? I'd use it in a heartbeat and haven't seen a uoa on it in a Subaru turbo. If it has Synerlec it will have higher levels sulfur and that won't show up on most uoa's.

I doubt you will find many unbiased opinions on it and there isn't much data on it. Keep your intervals short on any oil though. E85 even shreds Rotella T6. Do two or three uoa's on it and you might be switching to Mobil1 15W-50 (only a slight exaggeration).

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Old 09-24-2013, 05:42 PM   #12
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Excellent! Im really glad we got the ball rolling on this subject and thank you to everyone for your replies. I will most definitely send in a sample for testing - will probably wait until second change of RP 5w40 just to ensure there is no previous carryover from oil thats in it now. What ballpark does the testing run anyways? just curious.

bluesubie: If I remember right, I think it says Synerlec but I will check when I get home and report back.
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Old 09-24-2013, 05:49 PM   #13
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Dude, where's your car?
He sold it for a Fiat 500 convertible
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Old 09-24-2013, 05:57 PM   #14
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EEEWwwwww
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Old 09-25-2013, 01:40 PM   #15
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I run the T6, no problems yet. Then again, no one has really had problems with it that I know of.
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Old 09-25-2013, 02:00 PM   #16
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Quote:
Originally Posted by NMsubaru25 View Post
Excellent! Im really glad we got the ball rolling on this subject and thank you to everyone for your replies. I will most definitely send in a sample for testing - will probably wait until second change of RP 5w40 just to ensure there is no previous carryover from oil thats in it now. What ballpark does the testing run anyways? just curious. bluesubie: If I remember right, I think it says Synerlec but I will check when I get home and report back.
Oil Analyzer's Inc charges $22.45 and includesTBN, oxidation and nitration. Blackstone charges $25 and TBN is $10.

-Dennis
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Old 09-26-2013, 06:47 PM   #17
NMsubaru25
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Sounds good, thats cheaper than I thought it would be. Now I just have to put some miles down so I can get a change or two through. Can't be wasteful you know so just have to drive the garage queen for a while
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Old 10-28-2013, 05:25 PM   #18
NMsubaru25
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Just wanted to update everyone, the oil analysis results will probably take a little longer than expected to get up. I just picked up a 6-speed, new turbo, and some other goodies to install. I haven't forgotten though and will send off samples as soon as I get them through the car
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Old 10-28-2013, 11:46 PM   #19
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Quote:
Originally Posted by NMsubaru25 View Post
Just wanted to update everyone, the oil analysis results will probably take a little longer than expected to get up. I just picked up a 6-speed, new turbo, and some other goodies to install. I haven't forgotten though and will send off samples as soon as I get them through the car
Thanks for the update
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