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My truck calls for 5w20. Had a mix up just changed it & realized I used 5w30. Is this bad??

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  • Cars & Trucks Master
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Hi Beth:
Shouldn't be a big deal. What it means is that the oil will be "stiffer" once it is hot, so the oil pressure may be a bit higher. I would not recommend over-revving it until you get around to changing it. Once engines get older, it's not necessarily a bad thing to run heavier oil.

Posted on Apr 16, 2015

  • Beth Feb 21, 2016

    Thanks Ted

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  • Cars & Trucks Master
  • 1,511 Answers

NO. 10-30 is normal. So make adjustment during the next oil change.

Posted on Apr 16, 2015

  • Beth Feb 21, 2016

    I did, thanks Daytona

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SOURCE: right oil for my car

pfboyd is right. The old school thinking was that the thicker the oil, the better it is for the bearings. But, the car makers are doing a much better job of building motors to spec, and the oil quality has made considerable strides as well. I would not hesitate to use the recomended oil viscosity from the manufacturer.

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SOURCE: can i use 5w30 instead of 5w20 oil on a 2006

you can but not recommended. the reason for the thinner oil is the tolerances in the bearing races on these engines are very tight, requiring thinner oil. 5w30 is ok for sure if you are going synthetic.

Posted on Nov 13, 2009

Testimonial: "thank you very much. ran across some synthetic oil .. cant complain it was free.."

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SOURCE: What is proper oil for 2002 Vue 6 cyl? 5W30 or

5w 30,,,,,only the honda 3.5 in the newer vue took 5w20

Posted on Mar 01, 2010

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SOURCE: Recommemded engine oil for 2008 Ram 4.7L. Dodge

It won't hurt anything,so long as the oil is a little
thicker for hot weather use. Not 100% sure about
those grade of oils, but so long as it's a quality synthetic oil, I wouldn't worry about it.

Posted on Mar 30, 2010

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SOURCE: I took my 1996 BMW Z3 4cyl to Jiffy lube for an

I agree with the previous expert.

Get the oil changed. Use what the manufacturer recommends. Your engine is designed for a specific viscosity, and you need to adhere to the manufacturer's specifications. Nowadays, oil does much more than 'lubricate the engine'. The oil moves the variable valve timing, and a host of other tasks.

Viscosity is important.

Too thin, too much volume. Too heavy, to little volume.

...Will it be OK? I would think so, but, you really need to get the right oil in it, Make Jiffy Lube change it for free. They screwed up. Not you.

Posted on Aug 04, 2010

Testimonial: "I went back to Jiffy Lube with the owners manual, and showed them what the Mfg recommended.. They agreed to change the oil!!.. Thanks for the advise!"

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