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Old 05/18/06, 05:29 PM   #1
DiggetyDan
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Can you mix 10w-30 and 10w40 motor oil?

I just came up from the garage - figured i'd do a quick oil change before heading out for a drive. I thought I had a box full of oil but forgot i had given the wife an oil change a couple weeks back. It turns out I have 2 quarts of 10W-30 and 2 quarts of 10W-40.

Would it damage the engine if I combined these two?
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Old 05/18/06, 05:44 PM   #2
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Nope...it'll give you about a 10W-35.

Did you know that 95% of all statistics are made up on the spot?
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Old 05/18/06, 05:50 PM   #3
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Quote:
Originally Posted by Apogee
Nope...it'll give you about a 10W-35.
hehe, thanks apogee.
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Old 05/18/06, 06:55 PM   #4
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It won't damage the engine if you change the oil again quickly. Never, Never, Never combine oils. Don't even use the same viscosity oil from different manufacturers. There are unique additives for each oil and sometimes they don't play well together when mixed. You will probably be OK, but why risk having to pay $1000 or so to overhaul an engine. Don't do it. Better safe than sorry.

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Old 05/18/06, 07:07 PM   #5
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Quote:
Originally Posted by scottmcwms
It won't damage the engine if you change the oil again quickly. Never, Never, Never combine oils. Don't even use the same viscosity oil from different manufacturers. There are unique additives for each oil and sometimes they don't play well together when mixed. You will probably be OK, but why risk having to pay $1000 or so to overhaul an engine. Don't do it. Better safe than sorry.

Scott
Are you serious?

If thats the case I've been flirting with disaster for years when i do my monthly *"Polish oil change"







*add a qt when low
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Old 05/18/06, 07:12 PM   #6
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same here. Been doing that to my wifes car since it was new. It's never seen a wrench and it still purrs like a kitten at 200K miles.
now too bad the wife doesn't....
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Old 05/19/06, 01:21 AM   #7
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I'll third that. I have my brand preference but I'll use whatever if necessary to keep oil in them.
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Old 05/19/06, 01:29 AM   #8
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Honestly it's just oil. It just coats metal parts so they can slide on other metal parts without getting too hot. Mixem, matchem, do whatever you want as long as they are lubricated.

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Old 05/19/06, 02:02 AM   #9
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Nice motor pic in your gallery

But I don't think four quarts is enough to change your oil anyway. So go get a case of Castrol 10-40 and a couple of Motor Craft filters

"Deep faith eliminates fear... on the trail" Michael Alan Stark April 14, 1990 - October 28, 2007 My Son, Best Friend and Wheeling Buddy.
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Old 05/19/06, 04:10 AM   #10
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Quote:
Originally Posted by DiggetyDan
I just came up from the garage - figured i'd do a quick oil change before heading out for a drive. I thought I had a box full of oil but forgot i had given the wife an oil change a couple weeks back. It turns out I have 2 quarts of 10W-30 and 2 quarts of 10W-40.

Would it damage the engine if I combined these two?
You will be fine with that. They will mix right in with each other and no harm will be done. Even if you were to mix syn with conventional you'll be fine. If you were to labratory test your oil it will read out as not a true 10w-30 but no harm will be done. Your good.
If your doing this in a pinch cause you need to add oil then go for it but if you can like stated above get yourself 6 or so quarts of what you need when you do it the first time

Last edited by TJK74; 05/19/06 at 04:41 AM..

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Old 05/19/06, 04:30 AM   #11
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Quote:
Originally Posted by astark

I don't think four quarts is enough to change your oil anyway. So go get a case of Castrol 10-40 and a couple of Motor Craft filters
That's just what I was thinking!

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Old 05/19/06, 03:43 PM   #12
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I've mixed oils before but always try to use the same viscosity for all six quarts. If you've ever seen two or more types of oil poured into a clear container, they will separate out. When they are running through the engine, I doubt that it's that big of a deal, but I wouldn't mix them intentionally on any kind of regular basis.

'When my Bronco is finished' is only a hypothetical statement.
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Old 05/19/06, 04:25 PM   #13
commonlaw
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Never had a problem mixing.

Also, I noticed that you are only putting 4 quarts in? Not sure of your set-up but that seems low.

"Lordy I have loved some ladies, and I have loved Jim Beam, and they both tried to kill me, in 1973."
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Old 05/19/06, 07:28 PM   #14
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I once mixed brand and viscosity, my shirt came out of the dryer wrinkled, I burnt some burgers on the barbeque, I ran out of toilet paper and then left my coupons at home when I went to the store.

Don't take a chance, you need to get more oil anyway and you might as well do it right, as that Bronco is your baby and it deserves the best you can provide.

If you take good care of your Bronco, it will take good care of you, and what you put into that relationship will be reciprocated.

"Deep faith eliminates fear... on the trail" Michael Alan Stark April 14, 1990 - October 28, 2007 My Son, Best Friend and Wheeling Buddy.
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Old 05/20/06, 11:04 AM   #15
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here's a mystery

My oil level is showing full after only 3 quarts, it's on the higher side of the safe line. I've got a 302 which from the sound of it should take 6? I drained the oil out of the bottom plug - I did notice there was another plug closer to the front of the vehicle on the same pan, does that need to be drained also?
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