5w30 different from 10w30 ?

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329
Location
MS
My oil cap say 5w30, should I stay with 5w30, or I can use 10w30 ? and what is different between those 2 ? thanks
 
Messages
441
Location
Bismarck, ND
i agree. quicker lubrication at start up. and sometimes using a 5-30 over a 10-30 actually helps fuel mileage. mainly cuz you use less energy at startup
 
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1,084
Location
Florida, USA
Although one would think that at operating temps a 5W-30 has the same viscosity as a 10W-30, the truth is that <b>viscosity "ratings" have some latitude </b>and most 10W-30 oils are higher viscosity than their 5W-30 counterparts from the same manufacturer, even at full operating temps.
 
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6,156
Location
Buffalo, NY
Firstly, if your car says to use 5W-30, then use it. The difference is basically that 10W-30 uses a thicker base oil but less additives. Yes, there is more friction at start-up using 10W-30. But there is also more shearing using 5W-30 and up until the late 1990s, many lubrication guides/car manuals stated that 10W-30 should be used for "extended highway driving" largely because of 5W-30 shearing down to a 20 weight. However, 5W-30s are vastly improved and this isn't as true as it once was and 5W-20 will protect most engines adequately anyways. But 10W-30 may still be ideal with some applications where it is called for due to higher operating temperatures or constant summer highway driving...
 
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11,184
Location
Bad Axe, MI
Better yet if it states 5w30 use 0w30 and get little better befit of quicker flowing oil at start up where most wear happens.
 
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11,184
Location
Bad Axe, MI
 Originally Posted By: gfh77665
You are from MS, so, stay with the factory spec for the duration of warranty, THEN go to 10-30. Thats an excellent oil for our southern climes.
Any 5 or 0w30 will protect in the heat just as good as a 10w30 oil would. ;\) what car is this going in and whats it's use going to be??
 
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5,025
Location
Southeast Texas
 Originally Posted By: Nickdfresh
Firstly, if your car says to use 5W-30, then use it. ...10W-30 may still be ideal with some applications where it is called for due to higher operating temperatures or constant summer highway driving...
In MS and TX climate, I agree 100%.
 

killagt

Thread starter
Messages
329
Location
MS
I bought this car from dealer, and it already had 134k miles, I dont know what oil weight it had in their, but blackstone say it 5w30 ( How do they know this ), that why I want to ask if 5w30 is ok, I alway use 10w30 on all my car down here. BTW what best for auto-rx clean and rinse phase 5w30 or 10w30 ? thanks
 
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3,756
Location
CA
 Originally Posted By: daman
 Originally Posted By: gfh77665
Any 5 or 0w30 will protect in the heat just as good as a 10w30 oil would. ;\)
I don't know about that. If it were true, there would be no more 10w-30 made. I would take a quality 10w-30 for high heat, hard driving any day over a 0 or 5w-30.
 
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6,987
Location
Michigan
They know by the viscosity falling in the range for that oil. 5-30 or 10-30 will work fine in your climate.
 
Last edited:
Messages
11,184
Location
Bad Axe, MI
 Originally Posted By: BuickGN
 Originally Posted By: daman
 Originally Posted By: gfh77665
Any 5 or 0w30 will protect in the heat just as good as a 10w30 oil would. ;\)
I don't know about that. If it were true, there would be no more 10w-30 made. I would take a quality 10w-30 for high heat, hard driving any day over a 0 or 5w-30.
well if that were true then any car ran in the summer when it's hot out useing 5w30 would melt down and seize. 5w30 is what GM recomends and will protect fine in the summer heat,it's still a 30w when hot.
 
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4,942
Location
Billings, MT
10W-30 can be a conventional 0W-30 pretty much has to be a synthetic Not everyone is willing to use synthetic. And some people are stuck in the "thicker is better" mentality.
 
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8,859
Location
Texas
 Originally Posted By: Nickdfresh
Firstly, if your car says to use 5W-30, then use it. The difference is basically that 10W-30 uses a thicker base oil but less additives.
I think that's generally true of conventional oils (at least in past years), but I don't think its necessarily true of modern synthetics. From what I've been reading here and elsewhere, the current trend seems to be that a lot of synthetic oil makers use a better overall base oil for 0w30 and the Xw20s than they do for 10w30, because they can get away with a lesser base oil for 10w30. Starting with a sufficiently high VI base oil and using pour-point depressants has done a lot to reduce or eliminate the dependence on VIIs for wide viscosity range oils.
 
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13,132
Location
By Detroit
 Originally Posted By: killagt
BTW what best for auto-rx clean and rinse phase 5w30 or 10w30 ? thanks
I'm wondering if straight 30 may be the best for Auto Rx clean and rinse.
 

killagt

Thread starter
Messages
329
Location
MS
Will Pennzoil Yellow bottle work perfect with auto-rx clean and rinse ? btw some one told me that Pennzoils Yellow bottle is not group 3, it that true ? thanks
 
Messages
3,756
Location
CA
 Originally Posted By: daman
 Originally Posted By: BuickGN
 Originally Posted By: daman
 Originally Posted By: gfh77665
Any 5 or 0w30 will protect in the heat just as good as a 10w30 oil would. ;\)
I don't know about that. If it were true, there would be no more 10w-30 made. I would take a quality 10w-30 for high heat, hard driving any day over a 0 or 5w-30.
well if that were true then any car ran in the summer when it's hot out useing 5w30 would melt down and seize. 5w30 is what GM recomends and will protect fine in the summer heat,it's still a 30w when hot.
I don't follow your logic.
 
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