What Grade engine Oil to use?
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This is a discussion on What Grade engine Oil to use? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Guys i'm lost, what grade engine oil should i use in my Subie, J-spec with an Ej20K, i've heard 5w30 ...

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    Registered User Carl Wrx's Avatar
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    Post What Grade engine Oil to use?

    Guys i'm lost, what grade engine oil should i use in my Subie, J-spec with an Ej20K, i've heard 5w30 & 10w30? Can anyone help
    Last edited by Carl Wrx; 06-24-2008 at 08:53 PM.

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    Registered User teflon_jones's Avatar
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    How many miles are on your engine? If less than 75k, then stick with what the manual recommends (5w30?). If you have more than 75k miles, then I'd go one weight heavier.
    Scott
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    Registered User Pavia's Avatar
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    +1, but either one is fine.
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    Registered User Carl Wrx's Avatar
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    Ok, i just checked & my odo says im @ 92k miles..

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    Registered User On_Thy_edge1's Avatar
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    I had a 94 subie legacy with the 2.2T. And once I hit about 75k I switch over to a heavier cause my father is mech. And that is what he told me to swtich over to.
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    Registered User Carl Wrx's Avatar
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    Ok guys this is gonna sound real NOOB, but heavier weight is refering to the 10w 30 right? I'm new to all this so dont kill me

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    Registered User Acrdys's Avatar
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    Quote Originally Posted by Carl Wrx View Post
    Ok guys this is gonna sound real NOOB, but heavier weight is refering to the 10w 30 right? I'm new to all this so dont kill me
    sorry to single you out but...

    Quote Originally Posted by teflon_jones View Post
    How many miles are on your engine? If less than 75k, then stick with what the manual recommends (5w30?). If you have more than 75k miles, then I'd go one weight heavier.
    so <75k use 5w30 if more than use heavier weight. you had two options 5w30 and a 10w30. 5w30 is for <75k then that means >75k = 10w30.

    I dunno about oil but i'm guessing from this that 10w30 is the heavier one
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    Registered User rr1911's Avatar
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    10w30 should be fine

    notice the 10 is followed by a (w) which means weight... so 10 would be the weight and 30 would be the body
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    Registered User Carl Wrx's Avatar
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    We all cant be samart, some ppl catch on quicker than other's besides i wanna make sure i get the right thing for my car, so i'll keep askin dumb questions. Sorry to single you out

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    Quote Originally Posted by rr1911 View Post
    10w30 should be fine

    notice the 10 is followed by a (w) which means weight... so 10 would be the weight and 30 would be the body
    Winter, W Stands for Winter... At least that's the way I learnt it. 5w will flow easy er than 10w when cold so the lower the number the better for winter cold start ups... The second number is for when the oil is hot, that's the viscosity it should stay at when up to operating temps, the higher the better in hot climates in general...
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    i put 5w 20 in my car a few days ago. will it do anything to the engine sence its not 5w 30

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    Registered User rr1911's Avatar
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    Quote Originally Posted by wrxdrvr View Post
    Winter, W Stands for Winter... At least that's the way I learnt it. 5w will flow easy er than 10w when cold so the lower the number the better for winter cold start ups... The second number is for when the oil is hot, that's the viscosity it should stay at when up to operating temps, the higher the better in hot climates in general...
    thats one way to remember it i guess... same concept tho lower for the winter usually higher for the summer that being the 5 and also 10... so wait you only use winter oil

    just remember lighter weight usually equals more power... i use 0w-20 in all of my cars all year round
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    Registered User Scoob E Roo's Avatar
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    Quote Originally Posted by Carl Wrx View Post
    Guys i'm lost, what grade engine oil should i use in my Subie, J-spec with an Ej20K, i've heard 5w30 & 10w30? Can anyone help
    Carl, I looked at the weather history for your location and it says you have low temps of 73 and highs of 87 deg F throughout the year. If that is true, I doubt you will see any difference between 5W30 and 10W30, regardless of the number of miles on your car.

    Mike

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    Registered User teflon_jones's Avatar
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    Quote Originally Posted by Scoob E Roo View Post
    Carl, I looked at the weather history for your location and it says you have low temps of 73 and highs of 87 deg F throughout the year. If that is true, I doubt you will see any difference between 5W30 and 10W30, regardless of the number of miles on your car.

    Mike
    Great point, I didn't notice the location! I'd go with a 10w40 then.
    Scott
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
    '13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
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    Registered User Acrdys's Avatar
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    Quote Originally Posted by Carl Wrx View Post
    We all cant be samart, some ppl catch on quicker than other's besides i wanna make sure i get the right thing for my car, so i'll keep askin dumb questions. Sorry to single you out
    understood
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