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#4509580 - 09/06/17 10:34 PM More oil consumption with Castrol 0w40 over 0w30?
levesqu6 Offline


Registered: 11/04/08
Posts: 5
Loc: Michigan
2006 bmw 330i with the NA N52 straight 6. I have previously been using longlife-01 Castrol 0w30 and switched to longlife-01 Castrol 0w40 since its cheaper, available locally, and so i can just buy one type of oil for it and the old m3. I have have noticed around another quart of oil consumption over 10k miles with the 0w40. This question is more of a curiosity if a thicker oil could burn at a higher rate than a thinner oil. In my case it is possible that theres something else like the weeping oil pan got worse (though i havent noticed spots on driveway).

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#4509585 - 09/06/17 10:45 PM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
WhizkidTN Offline


Registered: 12/05/16
Posts: 488
Loc: E. Tennessee
I'd check your PCV valve.
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His: '12 Kia Optima SX - 2.0L GDI Twin-Scroll Turbo [Tuned] (71K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (66K)
>EDGE 0W-20, Fram XG6607

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#4509595 - 09/06/17 11:01 PM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
andrewp1998 Offline


Registered: 10/18/08
Posts: 853
Loc: MA USA
aks trav!
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2001 Honda civic HX vtecE- 5 spd,230k+

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#4509599 - 09/06/17 11:08 PM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
The_Nuke Offline


Registered: 07/21/13
Posts: 288
Loc: D/FW Metroplex
Not unheard of in some engines. See if you can find the NOACK values for each on PQI. If the 0W-40 has a higher NOACK, the behavior you're seeing is normL, for lack of a better word, and shouldnt be of great concern IMHO.
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2012 Dodge Charger
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#4510003 - 09/07/17 01:47 PM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
umungus1122 Offline


Registered: 02/12/08
Posts: 1058
Loc: PA
A qt. over 10k miles is no biggie. It happens when changing grades/brands also sometimes.
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'95 Chevy 1/2t 305 205k -DuraBlend 5w-20, Puro Gold filter
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#4510050 - 09/07/17 02:31 PM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Just curious how you noticed the consumption? Did you get the "add a L" warning? Maybe it is just your sensor giving a strange reading, can be caused by a little water contamination in the oil.


Edited by mightymousetech (09/07/17 02:31 PM)
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Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL

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#4510494 - 09/07/17 10:44 PM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
levesqu6 Offline


Registered: 11/04/08
Posts: 5
Loc: Michigan
The car has a electronic dip stick so thats how i know when to add. It gets driven primarily on the highway for a least 25miles at a time so I'd be surprised if there was much water in the oil.

When i say a quart more i think it went from 1.5 to 2.5quarts over 10k miles. Still plenty acceptable but I'm asking here out of curiosity. I havent had a chance to find the NOACK % for these oils. Didnt know what that was until you suggested looking into it!

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#4510553 - 09/08/17 05:26 AM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
KL31 Offline


Registered: 06/03/16
Posts: 549
Loc: South OZ
Could be coincidence and could be that you'll need to do a few runs on the 0w40 to see if that level of consumption continues or not.
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95 MX-3 2.5L|Shell Helix Ultra 5W40|Wix 51356
04 Focus 1.8L|Wesfil Cooper WZ63|Valvoline MST 5W30
05 Kluger 3.3L|Wesfil Cooper WZ418|Magnatec 10W30 Semi Syn

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#4510600 - 09/08/17 07:06 AM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
SR5 Offline


Registered: 07/07/15
Posts: 4462
Loc: Down Under
Quote:
330i with the NA N52 straight 6

That is a nice engine.
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#4510612 - 09/08/17 07:26 AM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: levesqu6]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: levesqu6
The car has a electronic dip stick so thats how i know when to add. It gets driven primarily on the highway for a least 25miles at a time so I'd be surprised if there was much water in the oil.

When i say a quart more i think it went from 1.5 to 2.5quarts over 10k miles. Still plenty acceptable but I'm asking here out of curiosity. I havent had a chance to find the NOACK % for these oils. Didnt know what that was until you suggested looking into it!


Interesting. Yes, I know about the electronic dipstick, have had many BMWs, including the same 06 330 as you. I would like this is just a coincidence as the 0W30 and 0W40 are nearly the exact same oil. Only a very slight difference in 100 C viscosity between the two.
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2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL

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#4511386 - 09/09/17 08:31 AM Re: More oil consumption with Castrol 0w40 over 0w30? [Re: SR5]
levesqu6 Offline


Registered: 11/04/08
Posts: 5
Loc: Michigan
Originally Posted By: SR5
Quote:
330i with the NA N52 straight 6

That is a nice engine.


it is! its got a few typical bmw issues... leaky valve covers, oil pan gaskets, eats a water pump before 100k miles ($500 electric unit), ignition coils, and vanos solenoids that need to be cleaned or replaced every 100k. The engine is throttled by variable valve lift which I think is the source of the delay that makes it a challenging powertrain to drive smoothly when coupled with a manual transmission. But it makes great smooth power, and is very light since it has a magnesium alloy block.

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