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10w40 over 5w30 diesel #5388382 03/29/20 03:20 AM
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angryorc Offline OP
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should i choose 10w40 over 5w30 for high milage diesel engine?

Re: 10w40 over 5w30 diesel [Re: angryorc] #5388390 03/29/20 04:15 AM
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Char Baby Offline
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Many questions first.
What engine are you refering to?
What vehicle?...FORD, GM, VW, MB, what?
How many miles?
What oil(brands & weights) have you been using?
How is this vehicle used?
Etc.

Last edited by Char Baby; 03/29/20 04:16 AM.

Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: 10w40 over 5w30 diesel [Re: angryorc] #5388396 03/29/20 04:29 AM
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Olas Offline
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10w oils will pump and flow at minus25 celsius, 5w oils will pump and flow at minus30-35 celsius.

How cold does the climate get in Georgia? pick an oil with a Winter rating appropriate for your climate.


SAE grades are measured at 100c, do you know how hot your oil gets in regular use? If you have a bottle of oil that claims to be 40, but you only get your oil upto 80celsius then your oil is closer to a 50. If that same oil goes up to 120celsius its closer to a 30.

So find out how hot your oil gets and pick viscosity based off of that.

Re: 10w40 over 5w30 diesel [Re: angryorc] #5388424 03/29/20 07:07 AM
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Audios Offline
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It may not be totally accurate science, but almost every analysis Ive seen shows better wear numbers for a 10 or 15/40 than for the 5/40.One member running Mystik 15/40 always shows very very nice numbers compared to the 5 he ran in the earlier UOA.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI-T6 5/40
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: 10w40 over 5w30 diesel [Re: Char Baby] #5388547 03/29/20 10:38 AM
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angryorc Offline OP
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mercedes sprinter 2009 2.2 diesel bluetec, 171k miles, 10w40 was used from the beginning as i saw in service book, dont know why

Re: 10w40 over 5w30 diesel [Re: Olas] #5388549 03/29/20 10:40 AM
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angryorc Offline OP
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we dont have a winter here, temp goes down -5 for a month or so, mostly its above 0, have no idea how hot it gets, how do i check?

Re: 10w40 over 5w30 diesel [Re: Audios] #5388550 03/29/20 10:42 AM
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angryorc Offline OP
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that is interesting, maybe because its thicker and reduces engine wear better? this affects fuel economy but engine will have longer life?

Re: 10w40 over 5w30 diesel [Re: Audios] #5388554 03/29/20 10:46 AM
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kschachn Offline
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Originally Posted by Audios
It may not be totally accurate science, but almost every analysis Ive seen shows better wear numbers for a 10 or 15/40 than for the 5/40.One member running Mystik 15/40 always shows very very nice numbers compared to the 5 he ran in the earlier UOA.

UOA "wear numbers" have far more to do with engine specifics and operating conditions than with the oil. In fact, Blackstone has noted that there is no statistically significant difference between wear numbers for an appropriately rated oil. As is always the case here when numbers are reported no one has any clue whether they are significant or not.

People like to pin a lot of stuff on UOA results because it helps justify their oil choice and the expense of the UOA but in reality almost none of it is appropriate.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: 10w40 over 5w30 diesel [Re: angryorc] #5388558 03/29/20 10:51 AM
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kschachn Offline
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Originally Posted by angryorc
we dont have a winter here, temp goes down -5 for a month or so, mostly its above 0, have no idea how hot it gets, how do i check?

What 10W-40 oil are you looking at that has the approval your engine requires?


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: 10w40 over 5w30 diesel [Re: Audios] #5388573 03/29/20 11:13 AM
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Originally Posted by Audios
It may not be totally accurate science, but almost every analysis Ive seen shows better wear numbers for a 10 or 15/40 than for the 5/40.One member running Mystik 15/40 always shows very very nice numbers compared to the 5 he ran in the earlier UOA.


👍

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Re: 10w40 over 5w30 diesel [Re: angryorc] #5388580 03/29/20 11:25 AM
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The brand, and thus the add pack, was also changed with those viscosity changes. Iron wear tends to come from areas that operate in mixed and boundary lubrication where the additive package is more important.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: 10w40 over 5w30 diesel [Re: kschachn] #5388755 03/29/20 03:48 PM
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angryorc Offline OP
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any mb 228.51 would be fine i guess, i use Castrol VECTON Long Drain 10W-40 E6/E9

Re: 10w40 over 5w30 diesel [Re: kschachn] #5388860 03/29/20 06:47 PM
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Originally Posted by kschachn
Originally Posted by Audios
It may not be totally accurate science, but almost every analysis Ive seen shows better wear numbers for a 10 or 15/40 than for the 5/40.One member running Mystik 15/40 always shows very very nice numbers compared to the 5 he ran in the earlier UOA.

UOA "wear numbers" have far more to do with engine specifics and operating conditions than with the oil. In fact, Blackstone has noted that there is no statistically significant difference between wear numbers for an appropriately rated oil. As is always the case here when numbers are reported no one has any clue whether they are significant or not.

People like to pin a lot of stuff on UOA results because it helps justify their oil choice and the expense of the UOA but in reality almost none of it is appropriate.

I am still searching for one Topic here on BITOG which has study in it that thicker (10w 15w) oils have better protection over thinner....due to HTHS coifficient....


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 (Shell?) 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10W-40
Re: 10w40 over 5w30 diesel [Re: Kamele0N] #5388976 03/29/20 09:25 PM
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kschachn Offline
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Originally Posted by Kamele0N
I am still searching for one Topic here on BITOG which has study in it that thicker (10w 15w) oils have better protection over thinner....due to HTHS coifficient....

Well those look like winter ratings which don't have a direct correlation to the MOFT. But there's no debate that HTHS (and subsequently the MOFT) are what keep parts separated and prevent wear. Once they touch you'll get all the wear your care to have.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: 10w40 over 5w30 diesel [Re: angryorc] #5389053 03/30/20 02:05 AM
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Bailes1992 Offline
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Originally Posted by angryorc
any mb 228.51 would be fine i guess, i use Castrol VECTON Long Drain 10W-40 E6/E9


That's a full synthetic 10w40 with a strong TBN and good number of approvals. I have 10 litres in my garage I'm keen to use but unsure what to use it on yet!


19 Volvo V40 D3 - 19 Jeep Renegade eTorq - 03 Ford Mondeo 3.0 V6 - 96 LR Defender 90 300TDi
Castrol Edge 5w30 LL
Valvoline Maxlife ATF
Fuchs Sintofluid 75w80
Fuchs Sintopoid 75w90
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