5w-30 vs. 10w-30

[Drew99GT]

OH KNOW NOT AGAIN!!!

I was looking at Chevrons data sheets and now, the 5w-30 data sheet clearly states it's made with Isosyn basestock, where as the 10w-30 does not. Also, from Valvoline's MSDS, their 5w-30 is group II and the 10w-30 is group I.

I'm starting to come around into believing 5w-30 is a superior oil even in hot climates since it's made with more refined basestocks.

 

[Drew99GT]

Holy moly, I'm a group III+ member now

 

[toocrazy2yoo]

Well, tht would speak volumes for using 5W20 SM/GF4, now, wouldn't it?

 

[Drew99GT]

One little step at a time. Baby steps.

 

[MarkC]

I've seen, and bought bottles of Chevron 10W30 that say Isosyn on the bottle.
Also, in November of last year, I had an email discussion with a Chevron engineer, who told me that both Chevron and Havoline regular as well as High Mileage oils are Group II basestocks in each grade.

 

[Drew99GT]

Hmmmmmm; well 10w-30 is better then

 

[MarkC]

Could be, but there's only five-dozen ways to find out....

 

[jorton]

Quote:

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Hmmmmmm; well 10w-30 is better then

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If you can't decide, try 5w-40. Mix 5w-30 and 10w-40. That's what I do.

 

[Bill in Utah]

Drew,

A photo is worth a few words....

Take care, bill

 

[Bill in Utah]

(I hate not having an EDIT function)

Both are API SM BTW...

Bill

 

[Titan]

IF you drive mostly short trips...use the 5-30. IF you drive mostly long trips...use the 10-30...and extend those OCI's.

I base this OPINION on reported increased wear at startups due to the oil being so thick when cold, therefore the 5-30 recommendation if you are a short-tripper. The 10-30 might hold viscosity a bit better, and long trips are "easier" on the oil, therefore the 10-30 suggestion, with extended OCI's.

 

[Ugly3]

In my opinion, with the stability (viscosity) of todays 5w30 oils 10w30 is obsolete.

 

[toocrazy2yoo]

Handsome bottle..
We don't get that oil here, is that the Chevron "Havoline"?

 

[MarkC]

Yep. just a bit less add. pack.

 

[Blue99]

I think at temps above 50 degress F, from a viscosity viewpoint, the performance of 5W-30 vs. 10W-30, is so close, that any debate results in a hair splitting exercise.

Looking at market stats, the last figures I viewed for usage indicated that the 5W-30 & 5w-20 combined beat the 10W-30 share, but 10W-30 was still greater than either of the 5W grades on an individual basis.

The 10W-30 grade is still popular with DIY oil changers and as a bulk oil grade.

 

[RD400]

I know the Chevron 10w-30 I bought last week is still isosyn.

 

[surfstar]

I searched Chevron and Valvoline to compare 5vs10w30 oils. Neither listed specific Noack or HT/HS. Pennzoil does:

 

[surfstar]

Code:

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SAE Viscosity Grade SAE J300 5W-30 10W-30

API Service SM SM

ILSAC GF-4 GF-4

Gravity,°API ASTMD-287 31.4 31.0

Specific Gravity @ 15.6°C(60°F) ASTM D-287 0.863 0.872

Flash Point,°C ASTMD-93 216 221

Pour Point,°C ASTMD-97 -36 -36

Color ASTM D-1500 2.5 2.5

@ 40°C, cSt ASTM D-445 63.9 70.1

@ 100°C, cSt ASTM D-445 10.5 10.4

ViscosityIndex ASTM D-2270 158 135

CCS Viscosity, cP (°C) ASTM D-5293 5,800 (-30) 5,900 (-25)

MRV Viscosity, cP (°C) ASTM D-4684 25,100 (-35) 16,300 (-

HT/HS Viscosity, cP ASTM D-4683 3.0 3.1

Noack volatility, % ASTM D-5800 14.7 10.9

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Dang no edit button.
Anyways you can see the poorly formatted data. 10w30 is slightly better on paper (if you have cold starts often)

 

[surfstar]

ARRGH. It should be (if you DON'T have cold starts often).

 

[MarkC]

I like 10W30 becuase I believe(though I ahven't bothered to gather any proof yet) that it shears less than 5W30. I may be mistaken, but I still won't use 5W30 in my Jeep.