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#174648 - 02/01/06 06:21 PM can i mix 5w30 with 10w30?
tonttu Offline


Registered: 12/26/05
Posts: 151
Loc: sweden
i have gm 5w30 oils in the engine.i was thinking to put gm 10w30 in it,about 1/2,1 quart.is it ok,or should i only add 5w30 [Confused]

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#174649 - 02/01/06 06:21 PM Re: can i mix 5w30 with 10w30?
ToyotaNSaturn Offline


Registered: 04/11/03
Posts: 11247
Loc: Spring Hill, TN
Yes. As long as it's SL or SM rated, you'll be fine. It's completely safe to do so.

[Cheers!]

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#174650 - 02/01/06 06:33 PM Re: can i mix 5w30 with 10w30?
tonttu Offline


Registered: 12/26/05
Posts: 151
Loc: sweden
yes,both, 5w30 and 10w30 are sl/sj rated [Burnout] [Burnout]

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#174651 - 02/01/06 06:56 PM Re: can i mix 5w30 with 10w30?
TallPaul Offline


Registered: 10/22/03
Posts: 12986
Loc: By Detroit
I've even mixed straight 30 weight in with 10w30 and no apparent problems. Oh, I've mixed worse things than that too.  -

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#174652 - 02/02/06 01:38 AM Re: can i mix 5w30 with 10w30?
tonttu Offline


Registered: 12/26/05
Posts: 151
Loc: sweden
how about mixing 76 super synthetic blend about 1/2 or 1 quart to gm dino 10w30 4 quarts?

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#174653 - 02/02/06 06:04 AM Re: can i mix 5w30 with 10w30?
m2200b Offline


Registered: 08/28/05
Posts: 1574
Loc: Alamo, CA
The net effect of adding 1/2 or 1 gt of anything
in your 4.5 gt really doesn't change it much
as you can check in the shell viscosity mixer as its only changing it by 1/5 anyway. I do use add oil to aim the grade to where I want to try.

On my daughter's oil consuming tercel, I add 1 qt of 20-50 Castrol HM to see if thicker helps stop her consumption and rear main leak. On mine I add some moly laden VSOT or 10-40 to see if moly or thicker helps. Its like a low cost preview if you are going to change in 1k miles anyway.

On yours, you will change soon if you stay with 3K OIC so adding a blend with maybe 20% syn is like adding 5% syn. If you want to experiment and see how a blend works with GM dino I'd add all syn so at least you get a blend for the entire 4.5 gts. Costwise I'd add any dino since you'll drop it in a month.

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