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Old 03-13-2008, 08:31 PM   #1
leeswrx
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Unhappy Put the wrong oil weight in...HELP!!

Today I changed my oil and I put 5w20 in when it should have been 5w30. The oil is royal purple. Should I change the oil ASAP or will it be ok til the next oil change. Its a stock 2005 STI. Any and all help will be appreciated.
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Old 03-13-2008, 08:39 PM   #2
rhinotech
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You'll be fine as long as temperatures don't get into the 100's outside for the next 3k miles... The difference in 20 and 30 weight isn't that big of a deal to be freaking out about it unless you have a climate that calls for a 30 weight.

Read in your manual on the temps in which 30 weight oil is good for.. it should also show a 20w too..

I believe it's just a tad thinner oil... But I'm sure an oil guru will come in here and give you the low-down on the technical details.
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Old 03-13-2008, 09:31 PM   #3
Badler
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I would change it. That's just me though.
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Old 03-13-2008, 09:33 PM   #4
bdpAKAknox
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Quote:
Originally Posted by aaronmsadler View Post
I would change it. That's just me though.
agree
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Old 03-13-2008, 09:54 PM   #5
wrxwagon253
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It doesnt even matter like that..Its not a huge deal at all..Plus Royal Purple is almost 7.00 a quart here in The Seattle area so deffinently not worth changing it..
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Old 03-13-2008, 10:53 PM   #6
bluesubie
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Probably doesn't matter.
Royal Purple 5W30 is known for shearing to a 20 grade anyway. I wouldn't run RP xw30 in an STi, but that's just me. You're probably fine in AK as long as you don't drive too agressively.

-Dennis
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Old 03-13-2008, 11:03 PM   #7
leeswrx
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I went ahead and changed it anyway to be on the safe side. Id rather spend 40 bucks in oil than 1300 on a new block. Thanks for the support.
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Old 03-14-2008, 02:18 AM   #8
03Bugeye
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Quote:
Originally Posted by leeswrx View Post
I went ahead and changed it anyway to be on the safe side. Id rather spend 40 bucks in oil than 1300 on a new block. Thanks for the support.
You should run for President.
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Old 03-14-2008, 10:25 AM   #9
McGuillicuddy
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Good lord. Completely unnecessary.
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Old 03-14-2008, 11:11 AM   #10
WRXLTD
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Quote:
Originally Posted by McGuillicuddy View Post

Good lord. Completely unnecessary.
I agree.

The OP just wasted $30 or so in oil (even more if he changed the oil filter too). Last time I checked it's still Winter, so the possiblity of 100 degree weather in the next 3 months is slim to none in his area.

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Old 03-14-2008, 11:43 AM   #11
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Funny. Yeah if you were that worried about it then you did what made you feel best by changing it. Should have saved the drained oil and used it in your old chevy that burns oil! LOL!
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Old 03-14-2008, 01:12 PM   #12
bluesubie
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Quote:
Originally Posted by WRXLTD View Post
Last time I checked it's still Winter, so the possiblity of 100 degree weather in the next 3 months is slim to none in his area.
Personally, I probably would've drained a quart and added 5W40. But what does it still being winter have to do with running the minimum specified viscosity of 5W30?

-Dennis
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Old 03-14-2008, 02:13 PM   #13
WRXLTD
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Quote:
Originally Posted by bluesubie View Post

5W40. But what does it still being winter have to do with running the minimum specified viscosity of 5W30?

-Dennis
Because the temperature in Winter in lower than in the Summer, and that oil shears faster when the temperature goes up...

He would have been fine in the Winter months running that 5w20 this one time until his next oil change (within 3000 miles). Show me proof otherwise.
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Old 03-14-2008, 02:56 PM   #14
Doc Holiday
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40 bucks for piece of mind? good investment in my opinion
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Old 03-14-2008, 03:24 PM   #15
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He's in Alaska... He could have just used that oil, and when (...most likely) burned off, add some higher weight make up oil.
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Old 03-14-2008, 04:04 PM   #16
Nuke209
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I would think, if a 20 weight, just don't run it too hard, just casual daily driving should be fine. But do keep an eye on the oil level.
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Old 03-14-2008, 04:30 PM   #17
bluesubie
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Quote:
Originally Posted by WRXLTD View Post
Because the temperature in Winter in lower than in the Summer, and that oil shears faster when the temperature goes up... He would have been fine in the Winter months running that 5w20 this one time until his next oil change (within 3000 miles). Show me proof otherwise.
Read your owner's manual and tell me what the thinnest oil allowed by Subaru is. Regardless of outside temperature, the oil inside of an engine still gets very hot.

Like I said in my first post, he probably would have been fine since Royal Purple 5W30 shears to a 20 grade pretty easily anyway.
Check this thread for an example and this one as well (post #6).

Now show me proof of RP 5w20 showing good results in an STi. Heck, only I've only seen one good RP uoa posted on here.

strohausii actually hit the nail on the head. The 5W20 would probably burn off and he could have added some 5W40.

-Dennis
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Old 03-14-2008, 05:00 PM   #18
sama lama
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I can say I put Motul e tec 100 in my zx12r it dropped my oil temps an made the transmission shift better an the second oil change it got even better it cost $8.99 quart. If the price of a new engine is not important to you put in autovalue recycled oils. In my impreza an tohoe I use mobil one. Subaru rally team uses Motul brand oil.
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