Why would you ever want to run 10W-30 over 5W-30?

[PandaBear]

Typically I do this if the 5w30 was soldout and 10w30 remains. I would have no problem running 10w30 at all in all my cars calling for 5w30.

Or if I need to blend some thin oil on sale to thicken, 0w16 probably blend better with 10w30 than 5w30.

 

[kschachn]

Typically I do this if the 5w30 was soldout and 10w30 remains. I would have no problem running 10w30 at all in all my cars calling for 5w30.

Or if I need to blend some thin oil on sale to thicken, 0w16 probably blend better with 10w30 than 5w30.

Interesting, why would that be?

 

[Hohn]

Typically I do this if the 5w30 was soldout and 10w30 remains. I would have no problem running 10w30 at all in all my cars calling for 5w30.

Or if I need to blend some thin oil on sale to thicken, 0w16 probably blend better with 10w30 than 5w30.

I likewise have no issues running 10w30 on the viscometrics. My concern is that because it's a lower bar to meet, the blender has exploited that to cheapen the oil. This is quite often the case.

Thus, many are choosing the 0w and 5w oils not because they need the colder cranking performance, but because they want the categorically better oil that results from having to meet the higher bar when other requirements prevent it from being met by just overdosing with cheap OCPs.

That last part is important, otherwise you'd be back to the 1990s Syntec 5w50.

 

[PandaBear]

I likewise have no issues running 10w30 on the viscometrics. My concern is that because it's a lower bar to meet, the blender has exploited that to cheapen the oil. This is quite often the case.

Thus, many are choosing the 0w and 5w oils not because they need the colder cranking performance, but because they want the categorically better oil that results from having to meet the higher bar when other requirements prevent it from being met by just overdosing with cheap OCPs.

That last part is important, otherwise you'd be back to the 1990s Syntec 5w50.

It is hard to prove whether it matters or not until they are tested with UOA on the same car.

I have seen similar to slightly different base oil used, and it is not a guarantee of better NOACK or VI stability like what people think in theory as you just pointed out.

 

[PandaBear]

Interesting, why would that be?

I am not 100% sure but the viscosity is slightly lower on 0w16 over 0w20. Obviously I wouldn't intentionally seek out for it but if they are on sale for the same price and I'm only planning to blend, I may use 0w16 + 10w30 in more 10w30 and less 0w16 than 0w20 + 10w30. I don't care too much so whatever is on sale is all game for blending cheap oil.

 

[OVERKILL]

There are over two dozen EHC customers including big name and - I’ll stop there before folks get wound up …

Yep, I think we've even identified it in some of them in the past, correct?

 

[Olds394]

No, I thought it was from PQIA, whose name I couldn’t remember at the time.

 

[OVERKILL]

No, I thought it was from PQIA, whose name I couldn’t remember at the time.

Oh, yes, the screenshots are from the PQIA site.

 

[Faawrenchbndr]

What about 5W-40 instead of 5W-30? I run Rotella T6 and they have 10W-30 and 5W-40. (not sure why they don't have 10W-40)

Oil’s blended for diesel’s should be used in diesels.
The additive package certainly isn’t formulated for a gasoline engine. LSPI could be an issue as well if used in a direct injection engine.

 

[53' Stude]

Oil’s blended for diesel’s should be used in diesels.
The additive package certainly isn’t formulated for a gasoline engine. LSPI could be an issue as well if used in a direct injection engine.

Interesting. I’m using HPL CK4 5w30 HDEO in my Dakota with zero issues.

Even WWilson ran HDEO in his Dodge.

 

[Tempest1]

I would love to run 10W30 here, but there are so few options for the higher quality syn oils...unless you move up to HPL or Amsoil.

 

[Faawrenchbndr]

Interesting. I’m using HPL CK4 5w30 HDEO in my Dakota with zero issues.

Even WWilson ran HDEO in his Dodge.

Just sayin…… there are differences in oils made for diesel vs gasoline engines. I didn’t say you were going to have issues, it’s just not made for gasoline engine. The detergents are different, heck the whole edit of package is completely different. It’s not rocket science look it up.