??What oil should I use??
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This is a discussion on ??What oil should I use?? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; This seems to be a common question frequently asked here on the forums. Obviously when in doubt the first thing ...

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    Moderator Donkey's Avatar
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    ??What oil should I use??

    This seems to be a common question frequently asked here on the forums. Obviously when in doubt the first thing to check is your owner' manual or factory repair manual. As you will see it gives you a range of choices:


    So what do those numbers mean? The type of oil most automobiles use is called a multi viscosity oil. Hence the two numbers on the label. The first number designates the viscosity of the oil cold and the second the viscosity of the oil at normal operating temperatures. Motor oil - Wikipedia, the free encyclopedia 5W30 is the recommended oil for best fuel economy and is what Subaru puts in the car from the factory. As you can see from the factory manual page above,5w30 basically works for most of us due to climate temps. Obviously some might run a different oil in the winter and summer seasons depending on where you live or by preferred choice.

    But what should I use? Conventional or Synthetic? Or synthetic blend?The choice is up to you. There are some very good conventional motor oils on the market. As far as synthetic blends,it's kind of a scam. Either use conventional "dino" oil or your average Group III synthetic (it's basiclly a " synthetic blend anyways) I prefer synthetic due to longer oil change intervals,higher temp threshold (less chance of coking) and less sludge build up. Coking is a byproduct of oil when it breaks down. It is the solid like sludge that can block passage ways and drains.

    "If the inside of the bearing housing resembles the bottom of a frying pan and is coated with black crusty deposits, oil coking was the cause of failure. The bearings are oil cooled, and during normal operation temperatures don't get hot enough to cause oil coking. But when the engine is shut off, temperatures can rise to 600 to 700 degrees F. inside the housing as the turbo undergoes a period of heat soak. The oil oxidizes and forms coke deposits in the housing that then act like an abrasive to wear the bearings. Using a high temperature "turbo" oil or synthetic oil, installing an auxiliary oil cooler, and changing the oil every 3,000 miles can avoid oil breakdown and coking problems. In water-cooled turbos, coking is less of a problem provided the oil is changed regularly and you use a quality motor oil. So if you find an accumulation of black crud inside the housing, better check the coolant hoses for a kink or restriction."

    Turbocharger Diagnosis & Repair

    As far as synthetics,not all are the same. There are generally three types found. Group IIIs,Group IVs and Group Vs.

    Group III = Hydrocracked/hydroisomerized (mineral based "semi-sythetic")
    Mobil-1
    Shell Rotella T synthetic
    Castrol oil Syntec
    Quaker state synthetic
    Amsoil XL7500

    Group IV = Polyalphaolefin (POA)
    Amsoil Synthetic
    Royal Purple
    Motul 6100
    Lubro/Liqui Moly
    Eneos Nippon
    European Castrol oil Syntec
    Greddy

    Group V = Ester based
    Motul 300V
    Motul 8100
    Redline

    Group IV and V are the "true synthetics". Above I just showed some examples to give you an idea. Hopefully this clears up some confusion and also make sure to use a quality filter when ever possible!My opinion of a quality filter would be: Purolator,Wix,K&N or BOSCH.

    One of the best sites for oil and filter information!!
    Welcome

    Good quick reads with lots of info
    Motor Oil Viscosity Grades Explained in Layman's Terms
    Car Bibles : The Engine Oil Bible
    Last edited by Donkey; 11-15-2012 at 11:18 AM.
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    Sammich Makin' Pwincess wrxtreme06's Avatar
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    Master Baiter EJ257's Avatar
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    So I just passed the 60K mark - what oil do you recommend I use? Dino? Synthetic? What brands are good?

    Sorry, couldn't resist ...
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    Moderator Donkey's Avatar
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    Quote Originally Posted by EJ257 View Post
    So I just passed the 60K mark - what oil do you recommend I use? Dino? Synthetic? What brands are good?

    Sorry, couldn't resist ...
    I like Crisco or Extra Virgin olive..........
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    Quote Originally Posted by Donkey View Post
    I like Crisco or Extra Virgin olive..........
    He can go 7,500 miles between each change with extra virgin coconut oil.

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    Registered User benson156's Avatar
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    I use Royal Purple 5W-30 and have had no problems, they say that you can go longer without having to change your oil but I still go at the usual 3,000 that I always have.
    Hawk-eye Alliance #156

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    Stick it please.


    Thanks Ron.
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    Moderator   Sasquatch's Avatar
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    Highly stickworthy and possibly mandatory reading before joining.

    This link is an eyeful - maybe add it? www.bescaredracing.com - /sti/oil/filters/ Someone went to a lot of trouble dissecting oil filters.
    Last edited by Sasquatch; 01-13-2010 at 12:36 PM.
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    Registered User WRXwagonMAFIA's Avatar
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    valvoline synthetic. comes with a 300,000 mile engine guarantee as well as long as your mods are professionally installed.


    i only know this becuiase i am a valvoline employee. five years now



    any way, independent lab testing proves that our oil has 8X wear pretection than Mobil 1 and im sorry royal purple, but your oil is in the same class as our conventional oil. no not semi synthetic, conventional!!

    granted thats still 3X better wear protection than mobil 1.


    valvoline was the first company to produce a oil for use in a motor. the first locomotives were lubricated with valvoline base stock




    all in all yes i do work for valvoline, but i have done my research, and so have they. they were the first in the buisness and are still at the top of the market.




    so when it comes to the question," what oil do i use?" just ask jay lenno

    i guarantee he will tell you his garage filled with supercars contains not a drop of oil other than VALVOLINE



    does that help?
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    < recently switched to Valvoline Synth from M1.
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    Moderator Donkey's Avatar
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    Quote Originally Posted by 04.SPT.WRX View Post
    Highly stickworthy and possibly mandatory reading before joining.

    This link is an eyeful - maybe add it? www.bescaredracing.com - /sti/oil/filters/ Someone went to a lot of trouble dissecting oil filters.
    There are these as well:

    Oil Filters Revealed - MiniMopar Resources
    Armand's Subaru Impreza Oil Filter Comparison
    LesabreT.com's Oil filter write up..
    Oil filter comparison, 4 top brand oil filters cut up and compared. - NASIOC

    Flow and filtering ability are key with choosing a filter but most often overlooked is the proper bypass valve psi.
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    Registered User WRXwagonMAFIA's Avatar
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    you wont be dissapointed, your motor runs cooler, oils stays cleaner, and i personally grad 1-3 miles per gallon
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    Moderator   Sasquatch's Avatar
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    Quote Originally Posted by Donkey View Post
    There are these as well:

    Oil Filters Revealed - MiniMopar Resources
    Armand's Subaru Impreza Oil Filter Comparison
    LesabreT.com's Oil filter write up..
    Oil filter comparison, 4 top brand oil filters cut up and compared. - NASIOC

    Flow and filtering ability are key with choosing a filter but most often overlooked is the proper bypass valve psi.
    Add 'em all. Great easy to read stick worthy thread.
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    Moderator Donkey's Avatar
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    Quote Originally Posted by WRXwagonMAFIA View Post
    valvoline synthetic. comes with a 300,000 mile engine guarantee as well as long as your mods are professionally installed. i only know this becuiase i am a valvoline employee. five years now

    any way, independent lab testing proves that our oil has 8X wear pretection than Mobil 1 and im sorry royal purple, but your oil is in the same class as our conventional oil. no not semi synthetic, conventional!!

    granted thats still 3X better wear protection than mobil 1.

    valvoline was the first company to produce a oil for use in a motor. the first locomotives were lubricated with valvoline base stock

    all in all yes i do work for valvoline, but i have done my research, and so have they. they were the first in the buisness and are still at the top of the market.

    so when it comes to the question," what oil do i use?" just ask jay lenno

    i guarantee he will tell you his garage filled with supercars contains not a drop of oil other than VALVOLINE

    does that help?
    Valvoline is a great company and makes a great oil but your opinion of course is going to be biased. Any links to data? I mean Amsoil employee/dealers are going to make their product seem like its the cats meow too. AMSOIL - Comparative Motor Oil Testing
    I personally go by UOA's on my personal vehicle to help me choose an oil and let me know if its doing its job.

    Blackstone Labs
    Oil Analyzers, Inc. - Oil Analysis, Oil Testing Services
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    Registered User WRXwagonMAFIA's Avatar
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    i have been sending my samples to oil analyzers, inc. as well for about 60k now.


    i am not sure the name of the lab that did the testing between valvoline, mobil 1, penzoil, royal purple, castrol, mystery oil, and a few others, but i will get with my market manager sometime this week to see if he still has the spreadsheet of the analysis and all the data availiable to him, if not at least the labs name whom conducted the reasearch. i do know it was conducted over a 2 year period and was funded by the socioty of automotive engineers, so in tern it was an extensive test with in depth results.

    i will do my best to hunt down the information and come up with something to post
    04' WRB wagon stage 2
    wagon Mafia #1 Where my wagons at?

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