Mobil 1 5W30 in Subaru Outback Turbo 3750 mi OCI

Messages
296
Location
Eldora, Colorado 9000'
Hello all, a quick question for Subaru owners. I just bought a 2008 Outback 2.5 XT Turbo which calls for 5W30. I'm running M1 5W30 which I hear it loves from other Subaru owners. But, Subaru recommends 3750 mile oci with the turbo models. Is it just a waste of money or can I extend these drains to 5k+?
 

cmf

Messages
415
Location
Florida
Originally Posted By: Xstang
I could rant here, but I'll let these people do it for me: http://forums.nasioc.com/forums/showthread.php?t=2134379&highlight=mobil+1
I like how they compare M1 5w30 to T6 5w40 and Shaeffers 5w40. Apples to oranges anyone? There's a M1 Turbo Diesel 5w40 that is a much better one to one comparison with T6. I would not extend the interval on any 5w30 oil past 3750. I would however feel comfortable running a 5w40 synthetic for 5k. That's my opinion on the matter.
 
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3,442
Location
Occupied Virginia
Originally Posted By: AWDfreak
Originally Posted By: Xstang
I could rant here, but I'll let these people do it for me: http://forums.nasioc.com/forums/showthread.php?t=2134379&highlight=mobil+1
Even on IWSTI, I haven't heard too many great things about Mobil 1 on turbocharged Subarus. It's just what I've seen/heard though. As for the short OCI, it is a turbocharged Subaru engine, which supposedly can be heavy on motor oil.
Exactly. WRX owners on NASIOC have been complaining about using Mobil 1 in their turbocharged cars ever since it was first introduced here in 2002. Something about spun bearings, I believe.
 
Messages
2,448
Location
NJ
Your manual says that 5W-30 is preferred and that thinner oils provide the best fuel economy. It also list thicker viscosity oils and says that they are required to properly lubricate the engine in high temps. There are severe condition recommendations for up to 50 grade oils. Most Subaru turbo owner's prefer more robust oils like GC, RT6, and oils with an HTHS of 3.5 or higher. Basically anything that isn't Energy Conserving. The 3,750 mile interval became a recommendation from SoA when sludge in the oil screens became a problem. I blew a turbo with just over 20k miles on it (although I'm not sure if sludge was the exact cause) and I always perform uoa's. There have been a few good Energy Conserving uoa's popping up though. On nasioc (linked above), there were some recent good Pennzoil Ultra and Platinum uoa's. There's also a decent M1 0W-30 uoa posted here (after most of us told him he was crazy) that was run in a Cobb Stage 1 Forester XT. And there's even a good SuperTech 5W-30 posted here from a Cobb Stage II(?) WRX. You're not going to find many Subaru turbo uoa's going much past 5k though, or even several consistent EC uoa's. I go about 6k and used to go to 7-8k. Subaru has changed the interval on 2011 turbo's to 7,500 miles, but I believe they made changes to the oils screens several years ago as well as did some oil line rerouting in the 2011's. -Dennis
 
Messages
1,311
Location
the South
Personally, I would use T6 5w40 in it at the factory intervals while under warranty (if still applicable). After take it out to 5k or so with a UOA. My folks have a turbo Outback and use M1 5w30, but it requires a bit more top off than I would like. Haven't convinced them to try another oil in it though, as "Mobil 1 is the best". Subaru turbo's can be hard on oil.
 
Messages
296
Location
Eldora, Colorado 9000'
Thanks for all the info. I thought M1 5W30 was more sought after in Subaru turbos, I guess not the case. I may just get a few jugs of the Rotella and run that. I really don't care about fuel mileage in this car since it's rarely driven and only gets low 20s/gal anyhow. Thanks again for all the feedback.
 
Messages
5,152
Location
Great White North.. eh
Originally Posted By: bluesubie
Your manual says that 5W-30 is preferred and that thinner oils provide the best fuel economy. It also list thicker viscosity oils and says that they are required to properly lubricate the engine in high temps. There are severe condition recommendations for up to 50 grade oils. Most Subaru turbo owner's prefer more robust oils like GC, RT6, and oils with an HTHS of 3.5 or higher. Basically anything that isn't Energy Conserving. The 3,750 mile interval became a recommendation from SoA when sludge in the oil screens became a problem. I blew a turbo with just over 20k miles on it (although I'm not sure if sludge was the exact cause) and I always perform uoa's. There have been a few good Energy Conserving uoa's popping up though. On nasioc (linked above), there were some recent good Pennzoil Ultra and Platinum uoa's. There's also a decent M1 0W-30 uoa posted here (after most of us told him he was crazy) that was run in a Cobb Stage 1 Forester XT. And there's even a good SuperTech 5W-30 posted here from a Cobb Stage II(?) WRX. You're not going to find many Subaru turbo uoa's going much past 5k though, or even several consistent EC uoa's. I go about 6k and used to go to 7-8k. Subaru has changed the interval on 2011 turbo's to 7,500 miles, but I believe they made changes to the oils screens several years ago as well as did some oil line rerouting in the 2011's. -Dennis
^ This... Dennis covered what you need to know.
 
Messages
244
Location
Kansas
Originally Posted By: Grossomotto
Thanks for all the info. I thought M1 5W30 was more sought after in Subaru turbos, I guess not the case. I may just get a few jugs of the Rotella and run that. I really don't care about fuel mileage in this car since it's rarely driven and only gets low 20s/gal anyhow. Thanks again for all the feedback.
Good Call! Trust me, you'll love it.
 
Messages
499
Location
San Antonio, TX
Originally Posted By: HollowEyes
Personally, I would use T6 5w40 in it at the factory intervals while under warranty (if still applicable). After take it out to 5k or so with a UOA. My folks have a turbo Outback and use M1 5w30, but it requires a bit more top off than I would like. Haven't convinced them to try another oil in it though, as "Mobil 1 is the best". Subaru turbo's can be hard on oil.
+43547698 Stil wouldn't go more than 3K-3500K
 
Last edited:

cmf

Messages
415
Location
Florida
Originally Posted By: HollowEyes
Personally, I would use T6 5w40 in it at the factory intervals while under warranty (if still applicable). After take it out to 5k or so with a UOA. My folks have a turbo Outback and use M1 5w30, but it requires a bit more top off than I would like. Haven't convinced them to try another oil in it though, as "Mobil 1 is the best". Subaru turbo's can be hard on oil.
If they really like Mobil 1 they should try M1 Turbo Diesel 5w40. I would personally also use T6 5w40 over M1 TD 5w40 but M1 TD 5w40 would definitely be a better option than M1 5w30.
 
Messages
14,711
Location
Illinois
M1 5-30 is an outstanding oil especially in high heat applications like turbos. It is one of the few oils that have the Honda HTO-06 turbo rating, as does PP 5-30. M1 5-30 also carries the GM Dexos rating. I have friends that use it with well over 300K with high OCIs(10-15K).
 
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