5W20 vs. 5W30

Pennzoil motor oil
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Yes and 5w30s also quickly sheer down as they are more dependant on the add-pack. So in short order, 5w30s will NOT be thicker at operating temp...

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I had heard that...interesting. That begs the question: What was 5W30 designed for?

Ummmm...what is a used oil analysis?
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A "Used Oil Analysis," I believe there's a forum here full of nice results I never look at...
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And don't get me wrong, I would use 5w30 or 5W-20 in any application that calls for it with the type depending on mileage, driving style, season, how often I wanna change it, oil consumption, etc.

Motorcraft 5W-20 has been mentioned as one of THE BEST oils out there, regardless of how "thin" it is...

I just think it's a bit disingenuous to dismiss 10w30 as "thinner" than 5w30 based on a few data sheet numbers. 10w30 still has it's place in older vehicles or in extended summer driving...
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my 02 tacoma v6 4x4 calls for 5w30 or 10w30 so i use both pending on time of year.. seems like i get a tiny bit better gas mileage with the 5w than the 10w but its neglegable. here in NC i can run either weights and be fine.i dont understand the people here that dont go by manufacture recomendations. they dont type that on there for the fun of it.. i can understand if yours is consuming large amounts or oil or whatever but if your motor is fine why not run what the manufacturer wants you to run?
 
Sometimes 'manufacturer wants" are really hidden "governmental wants".... meaning it's good for things-other than your vehicle.... things like importing reductions, environment waste, air quality & consumer spending.
 
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Sometimes common sense outweighs what I consider a ploy to seek better fuel milelage and apease goverment regulations.I base my decisions on oil from being around big trucks and seeing how thin the 15w40 gets and they claim it thickens with more miles. But what effects me the most is how hot the oil would get and that was 10 gallons of oil. It seems logical to think that 6 qts would even get hotter. What gets me is defenders of 5w20 rave about how oil gets thicker when it cools but never talk about how it gets thinner as it gets hot. Iam worried about the heat not the cold starts if I was in Alaska, I may be on the other side.

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I guess massive amounts of real world evidence mean nothing compared to common sense.
 
if you car or truck calls for 5w30 or 10w30 what other weights do you guys use other than those? i assume a 0w30 would be ok? if so, why? whats the big deal?
 
Does Toyota, Honda, GM, Ford or Chrysler show 10w30 in their new non-commerical new vehicle owners manuals? I don' think so. From what I've seen, its 0-5W/20/30.
 
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if you car or truck calls for 5w30 or 10w30 what other weights do you guys use other than those? i assume a 0w30 would be ok? if so, why? whats the big deal?

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Yes, 0w30 should be just fine for any application that calls for a 5w30 or 10w30. I've used 0w30 Castrol Syntec in my STi and the owner's manual "recommends" a 5w30:

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The 2-3 MPG difference is not due to the oil alone, but it has some benefit.
There is not a huge difference between 5-20 and 5-30, and you can use either one with great success.
Mix them 50/50 in the newer car, if you can't decide.
 
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The 2-3 MPG difference is not due to the oil alone, but it has some benefit.
There is not a huge difference between 5-20 and 5-30, and you can use either one with great success.
Mix them 50/50 in the newer car, if you can't decide.

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haha.. i love that, its awesome. mix them 50/50

best answer yet!
 
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Does Toyota, Honda, GM, Ford or Chrysler show 10w30 in their new non-commerical new vehicle owners manuals? I don' think so. From what I've seen, its 0-5W/20/30.

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Chrysler recommends 10-30 in the 3.5L engine, with an exception made for 5-30 in the winter.
 
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I base my decisions on oil from being around big trucks and seeing how thin the 15w40 gets and they claim it thickens with more miles.

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Thinness/thickness is deceiving. Oils performance is dependent on actual viscosity which can't be seen with the naked eye.
 
answer this.. you know how some 30wts will shear down to a 20wt or close... what does a 20wt shear down too? or are they more resistant to shearing?
 
Castrol GTX is one particular oil that I have noticed that the 5w30 is thicker than the 10w30. It would tell me the 10w30 has less improvers and I would think this is good thing.
 
In my Corvette owners manual (2007) they strictly list 5w30 and specify synthetics meeting GM 4718m. Interestingly, 4718m includes both 5w and 10w30 on the GM Bulletin listing the oils meeting spec. My 2006 Lucerne just calls for 5w30 oils meeting GM 6049. It goes on to say that in extremely cold areas, you may want to use a 5w30 synthetic, or a 0w30.
 
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