5w30 vs 10w30
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This is a discussion on 5w30 vs 10w30 within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I was thinking about switching from 5w30 to 10w30 when i saw it advertised that 10w30 would be beneficial to ...

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    Registered User blahblah's Avatar
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    5w30 vs 10w30

    I was thinking about switching from 5w30 to 10w30 when i saw it advertised that 10w30 would be beneficial to my motor. My question is, is this advertisement a bunch of bs. What would be the benefits and drawbacks of switching?
    282 AWHP...267 lb-ft torque.
    2005 WRB WRX Sedan

    "he's a domestic fan with a hunger for rice"

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    Moderator Integra96's Avatar
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    Well, either would be fine, but I don't know why 10w-30 would be more "beneficial" or even what that means. I use 5w-30 or 5w-40. You'll get (maybe) slightly better mileage with a 5w-30, by the way.
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    actually 5w- would not help your gas mileage, the first number is w(winter) visc, so the oil is nearest to that number when your car is cold cranked, at op temp the oil (in this case 30weight) is the same for both the 5w and 10w. In my case I live in charleston, sc. It never gets below 55 here and 99% of the time its 70-90, there is no reason to run a 5w, so i run 10w-30. I see less burn off between oil change intervals w/ the 10w

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    Registered User blahblah's Avatar
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    so living in chicago i would probly wanna stick with a 5w30...i guess
    282 AWHP...267 lb-ft torque.
    2005 WRB WRX Sedan

    "he's a domestic fan with a hunger for rice"

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    Moderator Integra96's Avatar
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    Quote Originally Posted by TrackReady View Post
    actually 5w- would not help your gas mileage, the first number is w(winter) visc, so the oil is nearest to that number when your car is cold cranked, at op temp the oil (in this case 30weight) is the same for both the 5w and 10w. In my case I live in charleston, sc. It never gets below 55 here and 99% of the time its 70-90, there is no reason to run a 5w, so i run 10w-30. I see less burn off between oil change intervals w/ the 10w
    You're exactly right. I wasn't thinking when I typed that!
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    Administrator Trainrex's Avatar
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    Quote Originally Posted by blahblah View Post
    so living in chicago i would probly wanna stick with a 5w30...i guess
    With the cold winters you experience, I would stick with 5w30. You can always switch to 10w30 for the summer months if you'd like.

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    Moderator Integra96's Avatar
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    Quote Originally Posted by Trainrex View Post
    With the cold winters you experience, I would stick with 5w30. You can always switch to 10w30 for the summer months if you'd like.

    5w-40 for hot summers FTW.
    "Did you sleep well?"
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    Registered User Needles's Avatar
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    I use 5w-30 in the winter and 10w-30 in the summer.

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    02/04 WRX MSPT Tuned - 18g(DEAD)

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    Registered User WRXcelration's Avatar
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    im moving to phoenix az and just got m1 10w-30 put in because i couldnt find 10w-40 in M1....ill have to change my oil when i get there so what would be the best oil for the lovely 115 degree weather
    05 STI

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