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#153767 - 09/12/05 08:19 PM ****! Used 5W-20 instead of 5W-30 what now?
kyle morley Offline


Registered: 08/15/04
Posts: 50
Loc: NJ
Just changed the oil on '97 Saab (non-turbo 4). Thought I was pouring in 5W-30 Motorcraft semi, but as I was cleaning up noticed 2 of the 4 bottles were 5W-20 MC semi I must have grabbed by mistake.

What now? Still some hot weather left and Saabs don't like 20. Do I:
-leave it in an don't worry, but maybe change it a bit early.
- consider it a flush an leave it in for a few days but drain it before the next long trip.
- instantly drain it, flush the engine, and replace the filter again.

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#153768 - 09/12/05 08:23 PM Re: ****! Used 5W-20 instead of 5W-30 what now?
Willy_G Offline


Registered: 05/25/05
Posts: 350
Loc: Indianapolis, IN
Consider this a flush and do a 5/30 change ASAP...no need to change the filter.

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#153769 - 09/13/05 09:37 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
Blue99 Offline


Registered: 09/27/03
Posts: 2233
Loc: Wisconsin
Using the Shell Baseoils viscosity calculator, a 50/50 mix of 5W-20 & 5W-30 Motorcraft is 9.7 cSt @ 100C.

Take a look at some Motorcraft 5W-30 UOA's and I think you'll find that after 3K to 5K, it is shearing down to the 9.7 cSt, 58.2 SUS level, or below.

So I suggest option #1, leave it in & run a shorter OCI.

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#153770 - 09/13/05 09:44 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
Pablo Offline


Registered: 10/28/02
Posts: 46553
Loc: Duvall WA - Pacific NW USA
You may just get your best UOA ever!

I honestly wouldn't sweat it too much, knowing what I know now [Smile]

FWIW 5+ years ago I would have been sweating BB's, screaming etc......

SIDE NOTE: This not the first time I have read this happening here on BiTOG. It makes you wonder how much it happens and people never even notice!

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#153771 - 09/13/05 09:46 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
Gary Allan Offline


Registered: 09/28/02
Posts: 39806
Loc: Pottstown, PA
I suggest option #1, (modified). Leave it in & run it for your normal OCI ...which is probably way shorter than it has to be.

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#153772 - 09/12/05 10:10 PM Re: ****! Used 5W-20 instead of 5W-30 what now?
steveh Offline


Registered: 05/25/05
Posts: 692
Loc: wisconsin
living in NJ. Leave it in the cold weather is coming soon.

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#153773 - 09/13/05 05:12 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
mikemc Offline


Registered: 02/15/03
Posts: 1381
Loc: Southeast Kentucky
Please do a used oil analysis!

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#153774 - 09/13/05 06:35 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
Al Offline


Registered: 06/08/02
Posts: 13581
Loc: Elizabethtown, Pa
Well if you had the 100% MC it would shear down to about 8.8 cSt. anyway. And the 20 wt won't shear at all. Unless this vehicle is known to cause problems with 20 wt oil..I wouldn't wory about it. If you are paranoid ..drain out a quart or so and dump a quart of 10W-40 in there.

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#153775 - 09/13/05 06:35 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
pushrod Offline


Registered: 08/17/05
Posts: 56
Loc: Maryland
Go buy 2 quarts of 10w-30. Drain 1 quart plus out and top off with the 10w-30. 1 quart of 10w-40 would be OK also. [Smile]

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#153776 - 09/13/05 06:35 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
ToyotaNSaturn Offline


Registered: 04/11/03
Posts: 11221
Loc: Spring Hill, TN
Caution, your car will blow up. RED ALERT! RED ALERT! How do we attain the much strived for grace under pressure? Between the wheels you will notice a smooshed rabbit.

Ahem...

Presto! NOTHING will happen to your barchetta. Nothing. 5w-20's from Motorcraft and Pennzoil are arguably better than most dino's on the market. Use with confidence. UOA to prove to yourself that nothing happened to give you peace of mind.

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#153777 - 09/13/05 04:58 PM Re: ****! Used 5W-20 instead of 5W-30 what now?
Blue_Goose Offline


Registered: 07/13/05
Posts: 1870
Loc: New Hampsha
^^

Someone is a Rush fan [Smile]

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#153778 - 09/13/05 05:12 PM Re: ****! Used 5W-20 instead of 5W-30 what now?
Char Baby Offline


Registered: 05/25/05
Posts: 6858
Loc: Rochester NY
I used Valvoline 5W20(that a friend had given to me), in my daughters 1988, yes 1988 Honda Accord, 330,000 miles . It's now gone over 4000 miles during the hottest most humid summer that I can remember in a long long time. Engine ran great! Burned a 1/2 qt, and now it's ready for a change. I may stick with 5W20 although I will try Havoline.

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#153779 - 09/14/05 02:18 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
TomJones76 Offline


Registered: 11/06/03
Posts: 1250
Loc: Akron, OH
Does the MC 5W20 have the same additive chemistry as the 5W30?
I seem to recall that the 5W20 in several brands uses fancy-pants additives while the other brands use the more conventional Zinc-Calcium-based kinda' formula.

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#153780 - 09/14/05 08:17 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
vvk Offline


Registered: 12/18/02
Posts: 480
Loc: Philadelphia
quote:
Originally posted by kyle morley:
Just changed the oil on '97 Saab (non-turbo 4). Thought I was pouring in 5W-30 Motorcraft semi, but as I was cleaning up noticed 2 of the 4 bottles were 5W-20 MC semi I must have grabbed by mistake.

IMHO, you should not be putting low-HTHS 5W-30 oil in an engine that calls for minimum ACEA A3. Meaning HTHS of 3.5 or higher. 5W-20 adds insult to injury.

Look for oil with ACEA A3 rating on the bottle. If you prefer 5W-30, then use Valvoline Maxlife Synthetic -- it is widely available. There are many other choices.

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#153781 - 09/14/05 08:47 AM Re: ****! Used 5W-20 instead of 5W-30 what now?
Triple_Se7en Offline


Registered: 12/04/04
Posts: 6305
Loc: 1/2 hr. north of Detroit
Put in a bottle of VSOT (Valvoline Synpower Oil Treatment. One 15 oz gray bottle made hardly no difference in my dipstick reading. It will raise viscosity a whole number -- plus add all kinds of goodies already found in your MC... plus lots more moly & boron.

Sleep tight after that... you are good-to-go for 5K-easy.

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