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Super Moderator
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Yes.
 

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Because of laws physics and how the car was designed around them...

The manufacturer recomandation for the NEW car is written in the owner manual.

LE: At 174k miles I decided to go to a heavier grade (5W-40), synthetic. But that's me...
 

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Cake monster
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Running a different weight won't instantly kill an engine, it might reduce the service life of the engine though. If the recommended oil weight doesn't give you any trouble, then you might as well stick with it. I personally run heavier oil, some people prefer lighter and some people say go by the book and only that. Everyone has an opinion about oil. Keep it clean and level, that's what matters the most. :p
 

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Oil Wt

does it really make a differance on the weight of oil used in a vehicle?
This kind of discussion is like religion and politics.

Many ops, most based on no data.

My experience, if it matters.

I have had 5 Taurus/Sables and have 2 now. From '97 through '03.
I drove about 30K per year for 20 years, bought used, ran them hard, handed them off off to my 2 girls and their husbands.

I used 10W-30 Wal-Mart oil and Fram filters, although I now use Motorcraft. Never had an engine problem. So I can not relate to oil weight or brand.

However, I change my oil 3 months to 5K depending on the kind of driving. If I am driving on the road with minimum short trips, then 5K, Short trips, 3 months. My oil stays clean for the duration.

So, that is my story, not going to change my plan, it ain't broke.
Also have had 3 Lincoln Cont, and 1 now. All run to just under 100K and traded. Prestnt 95K. One engine replaced under warrenty, factory wanted it back and put a new production line engine in at about 25K. It had a noise and they did not know why. My brother who is a retired diesel rebuld specialist told me what it was by my description. Tight wrist pin. Makes sense. One of the few, if only knock that does not respond to oil pressure, and only happens on a very cold day. Wierd experience from the factory.

Over and out.

-chart-
 

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Because of laws physics and how the car was designed around them...

The manufacturer recomandation for the NEW car is written in the owner manual.

LE: At 174k miles I decided to go to a heavier grade (5W-40), synthetic. But that's me...
Just for fun, it might be fluid dynamics more than physics. ;)

I'm still running 5w30 at 236,000 miles and it works just fine since that is what my car was spec'd for.

I have used 10w30 in the past as well and I only noticed that the engine had a smidge less power.
 

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Premium Member
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I'm one of those that goes with the lighter weight oil. Regarless of which weight you chose, I highly recomment you go with a synthetic 0W-XX 20, 30, 40... Whichever but getting that oil moving on start up is critical to engine life. Go with the 0.
 
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