wrong oil - i used 20w50 how bad is that? - JeepForum.com
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post #1 of 16 Old 06-08-2009, 08:26 PM Thread Starter
MxAjN
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wrong oil - i used 20w50 how bad is that?

i used 20w50 by mistake, im an idiot is that very bad for my motor?

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post #2 of 16 Old 06-08-2009, 08:31 PM
mgramann
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Don't know what year/engine you have to know for sure. Fill out your profile when you can.

I had an older 4.0 cherokee that I would run 20w50 in during the summers. The heavier oil cushioned a wrist pin knock, and reduced oil consumption due to bad rings. It would use very little oil between changes, but when I changed to thinner oil in winter I had to watch it close.

I think you will be fine if it is an older, higher mileage engine where the tolerances aren't to tight.
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post #3 of 16 Old 06-08-2009, 08:45 PM Thread Starter
MxAjN
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yeah its a 05 4.0 with 193,xxx runs really good, just got the wrong oil , like i hjavent even started it yet, i just wanna kbow if i should go and change it out b4 driving it? or if it'd be fine to drive around, i do alotlotlot of driving too.
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post #4 of 16 Old 06-08-2009, 08:48 PM
1990JEEPXJ
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i wouldnt worry about it

Completely stock, and keeping it that way...

My POS
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post #5 of 16 Old 06-08-2009, 08:49 PM
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I always un 20W50. helps maintain my crappy oil pressure.
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post #6 of 16 Old 06-08-2009, 08:54 PM Thread Starter
MxAjN
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95 4.0&*** and yeah i deliver pizza 5 days a week so driving it like 5 hrs stop and go , when i switch back to 10-30 there wont be any problems?
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post #7 of 16 Old 06-08-2009, 10:26 PM
98junk
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It's summer time. Don't worry about it. Warm it up.
It may cost a little M.P.G. , but if that was a big concern, you wouldn't own a xj.
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post #8 of 16 Old 06-08-2009, 10:39 PM
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For the past couple of years here in PHX, I have used 20w50 in the summer. It helps with higher idling oil pressure. Given that temperatures near the pavement can approach 140 degrees F on a typical summer day here, it's certainly not too thick for those conditions.

Now in the wintertime, it IS too thick, even for S. Arizona, and then I switch back to 10w30.

As long as you switch it out before cold weather sets in up in NJ, you will be fine.

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post #9 of 16 Old 06-09-2009, 06:36 AM
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You'll be fine, nothing to worry about. it'll actually help if your oil pressure is a bit lacking.

When I lived in Phoenix I used 20w50 in my Mustang (5.0) year round - less leaks, better pressure.

Jason

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post #10 of 16 Old 06-09-2009, 06:44 AM
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I would say that on a cold start you could really starve the engine for oil. Chrysler does not sugest 10w30 for nothing. Oppinions very, but its your problem if it causes harm. Engines are expensive and oil is cheap. When in doubt, use the correct stuff. Just my two cents.
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post #11 of 16 Old 06-09-2009, 07:57 AM
AZ Jeff
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Quote:
Originally Posted by Houndmaster1 View Post
I would say that on a cold start you could really starve the engine for oil. Chrysler does not sugest 10w30 for nothing. Oppinions very, but its your problem if it causes harm. Engines are expensive and oil is cheap. When in doubt, use the correct stuff. Just my two cents.
That answer is technically correct, BUT.....it depends on other factors, too, which are often out of the control of the manufacturer once it leaves his factory.

Bearing clearances due to age affect how much oil starvation on startup will exist. So do wear factors in the oil pump. So does ambient temperature at startup.

Finally remember than thinner oil provides less viscous drag on rotating parts, and that helps with fuel economy, so the OEM's try to use the THINNEST oil that will provide adequate lubrication.

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
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post #12 of 16 Old 06-09-2009, 08:01 AM
mgramann
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In addition, the thicker oil will be less likely to run off the engine parts than a thinner oil. The result is more residue at startup, so even IF it takes longer to get oil pressure, the engine is protected.
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post #13 of 16 Old 06-09-2009, 08:07 AM Thread Starter
MxAjN
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its not too big of a deal for me if its bad, ill just change it out, but if its not bad ill just use it till i chanfge it again so change it or not??
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post #14 of 16 Old 06-09-2009, 08:14 AM
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Don't change it now-but change before winter.
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post #15 of 16 Old 06-09-2009, 08:19 AM Thread Starter
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k thanjks]
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