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#3336750 - 04/08/14 11:10 AM Oil for my di engine
waltywalt Offline


Registered: 02/10/14
Posts: 278
Loc: ny
What 5w30 syn oil has the best noack numbers and also I was looking for an oil that doesn't shear down so much. It seems like most of the 5w30 oils shear down to a 5w20 a lot in di engines. I usually use qsud or Castrol syntec.

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#3336759 - 04/08/14 11:21 AM Re: Oil for my di engine [Re: waltywalt]
Eddie Online   content


Registered: 12/07/03
Posts: 6975
Loc: Florida, Cape Coral
I ran PP 5w30 in my Turo DI mazda CX7 and have good UOAs using 6,000 mile oil change intervals. My oil did not shear down over the 6K miles. Ed
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#3336774 - 04/08/14 11:34 AM Re: Oil for my di engine [Re: waltywalt]
waltywalt Offline


Registered: 02/10/14
Posts: 278
Loc: ny
Thanks ed

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#3336775 - 04/08/14 11:35 AM Re: Oil for my di engine [Re: waltywalt]
waltywalt Offline


Registered: 02/10/14
Posts: 278
Loc: ny
Ive used pp also but isn't it on the lighter side of the 5w30s.

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#3336779 - 04/08/14 11:37 AM Re: Oil for my di engine [Re: waltywalt]
Quattro Pete Offline


Registered: 10/30/02
Posts: 27511
Loc: Great Lakes
Originally Posted By: waltywalt
What 5w30 syn oil has the best noack numbers and also I was looking for an oil that doesn't shear down so much. It seems like most of the 5w30 oils shear down to a 5w20 a lot in di engines.

The reason is that most of these readily available 5w-30 oils are energy conserving, which means they are formulated on the lower end of the 30-grade range of viscosity. And so it doesn't take much for it to drop into the 20-grade territory.

If you start with an oil that's formulated as a heavy 30-grade, then you're less likely to shear so much that it'll drop to a 20-grade. Unfortunately, such oils are not energy conserving. Example of such oil with very low Noack: Mobil1 ESP 5w-30.
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'02 530i (PU 5W-40)
'15 Q5 3.0T
'13 F700 GS (BMW HP 15W-50)

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#3336783 - 04/08/14 11:39 AM Re: Oil for my di engine [Re: waltywalt]
waltywalt Offline


Registered: 02/10/14
Posts: 278
Loc: ny
Mobil 1 esp is that the 15,000 mile oil

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#3336785 - 04/08/14 11:41 AM Re: Oil for my di engine [Re: waltywalt]
Quattro Pete Offline


Registered: 10/30/02
Posts: 27511
Loc: Great Lakes
Originally Posted By: waltywalt
Mobil 1 esp is that the 15,000 mile oil

No. You're thinking of M1 EP.
_________________________
'02 530i (PU 5W-40)
'15 Q5 3.0T
'13 F700 GS (BMW HP 15W-50)

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#3336810 - 04/08/14 12:12 PM Re: Oil for my di engine [Re: waltywalt]
dave1251 Offline


Registered: 07/15/05
Posts: 7474
Loc: Maricopa, AZ
Originally Posted By: waltywalt
What 5w30 syn oil has the best noack numbers and also I was looking for an oil that doesn't shear down so much. It seems like most of the 5w30 oils shear down to a 5w20 a lot in di engines. I usually use qsud or Castrol syntec.


I have a question. Why are you so concerned about shearing?
_________________________
make the inside of your engine oil cap white.
don't use.

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#3336814 - 04/08/14 12:17 PM Re: Oil for my di engine [Re: waltywalt]
waltywalt Offline


Registered: 02/10/14
Posts: 278
Loc: ny
Because I wanted to use a 5w30 and not a 5w20 to begin with. If I wanted to use a 20w I would of just started with it in the first place. Just personal preference I guess.

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#3336816 - 04/08/14 12:19 PM Re: Oil for my di engine [Re: waltywalt]
waltywalt Offline


Registered: 02/10/14
Posts: 278
Loc: ny
I have never got a uoa on the oil in this car but ive read on hear a lot about 5w30 oil shearing down to a 20w in a lot of di engines. I would guess its because of the fuel washing down but idk for sure.

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#3336823 - 04/08/14 12:38 PM Re: Oil for my di engine [Re: waltywalt]
Quattro Pete Offline


Registered: 10/30/02
Posts: 27511
Loc: Great Lakes
Originally Posted By: waltywalt
I have never got a uoa on the oil in this car but ive read on hear a lot about 5w30 oil shearing down to a 20w in a lot of di engines. I would guess its because of the fuel washing down but idk for sure.

I think Dave's point was that it may not necessarily matter that your oil thinned to a 20-grade. Engine manufacturers are well aware of the potential fuel dilution, and specify oil grades accordingly.

Now, if you started with a 20-grade and it ended up thinning to a 10-grade, then that could have been a problem.
_________________________
'02 530i (PU 5W-40)
'15 Q5 3.0T
'13 F700 GS (BMW HP 15W-50)

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#3336824 - 04/08/14 12:39 PM Re: Oil for my di engine [Re: waltywalt]
dave1251 Offline


Registered: 07/15/05
Posts: 7474
Loc: Maricopa, AZ
Originally Posted By: waltywalt
Because I wanted to use a 5w30 and not a 5w20 to begin with. If I wanted to use a 20w I would of just started with it in the first place. Just personal preference I guess.


OK. Does your manufacture recommend a 5W30? If so do you believe the engineers that have made this recommendation have factored in that a 5W30 will shear? If so testing was done on this engine design that it would be nearly impossible for you to replicate in everyday driving use and a 5W30 is robust enough to protect your engine for it's designed lifetime shearing and all.
_________________________
make the inside of your engine oil cap white.
don't use.

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#3336874 - 04/08/14 01:37 PM Re: Oil for my di engine [Re: dave1251]
TTK Offline


Registered: 10/23/07
Posts: 342
Loc: TN
Originally Posted By: dave1251
Originally Posted By: waltywalt
Because I wanted to use a 5w30 and not a 5w20 to begin with. If I wanted to use a 20w I would of just started with it in the first place. Just personal preference I guess.


OK. Does your manufacture recommend a 5W30? If so do you believe the engineers that have made this recommendation have factored in that a 5W30 will shear? If so testing was done on this engine design that it would be nearly impossible for you to replicate in everyday driving use and a 5W30 is robust enough to protect your engine for it's designed lifetime shearing and all.

With top notch thinking like that, we can just shut down all sections of BITOG except UOAs.
_________________________
2010 Volvo V70-3.2
Current Fill:Castrol Edge 5w-30
2014 Subaru Forester, 0w-20 Castrol Edge
2001 Chevrolet Prism
G-Oil Synthetic 5w-30

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#3336908 - 04/08/14 02:41 PM Re: Oil for my di engine [Re: TTK]
dave1251 Offline


Registered: 07/15/05
Posts: 7474
Loc: Maricopa, AZ
Oh really? Do you have purpose for posting this? Because your comment is very vague and it can be misinterpreted/interpreted into many directions.

Please explain.
_________________________
make the inside of your engine oil cap white.
don't use.

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#3336933 - 04/08/14 03:13 PM Re: Oil for my di engine [Re: waltywalt]
A_Harman Offline


Registered: 10/01/10
Posts: 4698
Loc: Michigan
Originally Posted By: waltywalt
What 5w30 syn oil has the best noack numbers and doesn't shear down so much.


Are you willing to go to boutique oils, or want to stick with readily available synthetics?

AMSoil HDD has 9% NOACK, and is very shear resistant. It's a diesel oil formulated for pre-2007 engines, so it's probably high SAPS.

RedLine 5w30 has 6% NOACK, and is very shear resistant. It is formulated for gasoline engines.
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1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
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