Recent Topics
Canadian Tire - M1 on sale...
by geeman789
03/05/15 12:41 PM
Amsoil SS 5w30 '10 Silverado 26k miles
by Flareside302
03/05/15 12:37 PM
NGK PRO-V Small Engine Spark Plugs
by SwedishRider
03/05/15 12:30 PM
Acura TL 3.7L oil experiment 3K update
by MajorCavalry
03/05/15 12:08 PM
SuperS@Menards $5.99
by LC
03/05/15 11:16 AM
'14 Focus ST 2L Ecoboost Pennzoil Platinum 5w-30
by quantim0
03/05/15 11:11 AM
Mobil / Mobil1 - most user friendly brand?
by wemay
03/05/15 10:09 AM
Anything to help a new mower run on low oil?
by Scott P
03/05/15 09:58 AM
Pentastar V6?
by hattaresguy
03/05/15 09:40 AM
Ticking 2008 BMW X3, oil choices?
by ryan2022
03/05/15 09:38 AM
Oil Filters PH 3675 & Puro L20195
by PurpleT
03/05/15 09:33 AM
Meijer: Rotella T5 $9.88/gallon, BEFORE rebate
by KzMitch
03/05/15 08:46 AM
Newest Members
HHMarc, mkanters, sjh888, tmfrahm, theblueox
53039 Registered Users
Who's Online
99 registered (a2gtinut, Aimbot9000, AEHaas, 1 FMF, AandPDan, 9 invisible), 1610 Guests and 244 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
53039 Members
66 Forums
227572 Topics
3630764 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#3213112 - 12/11/13 07:16 AM ~6500 miles acoustics of engine change.
BMWTurboDzl Offline


Registered: 04/15/10
Posts: 1456
Loc: Atlanta,GA
Happens like clockwork. At this mileage there's a noticeable acoustic change at idle and low rpm. It goes from butter quiet to more metallic. Is this mileage at the point where a particular additive takes over/stops working?

Factory OCI is ~13k miles. Oil is Castrol OE 5w30 LL04.
_________________________
'15 435i - Factory fill.
Prev
'10 335d
'06 330i
'03 330i

Top
#3213119 - 12/11/13 07:31 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
Char Baby Online   content


Registered: 05/25/05
Posts: 8008
Loc: Rochester NY
I've noticed similar sounds/harmonics toward the end of, what I call my normal OCI's(~5K miles). Smooth/quiet when the OCI is new, to some mild valve train noise(s) at the typical OCI change.

Though, I wouldn't call it noises in my engines, just more audiable!
_________________________
"Retired"

1980 Firebird FORMULA V8-NEW
2001 Lexus RX-300 V6-NEW
2004 Nissan Altima 2.5S-NEW
2006 Mazda 3i 2.0L-PreOwned

Top
#3213124 - 12/11/13 07:35 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
Phishin Offline


Registered: 05/01/12
Posts: 1584
Loc: Indiana
I couldn't do it. I couldn't do 13K mile OCI's in such a nice car. Why? To save a few bucks? Not when the oil is obviously out of grade...causing your changes in engine accoustics.

Have you done any UOA's on this car?

My bet is the oil is out of grade. I bet if you drained 2 quarts out and replaced with 2 quarts of 5w40, it would sound nice and quiet again.

The noise is telling you something: the oil is out of grade (too thin). If you want to run 13k OCI's....then use a thicker oil so it will shear into grade, rather than using 5w30 and having it shear out of grade. Run a good 5w40 or even 5w50 (which are usually on the thin side of a 50 weight).


Edited by Phishin (12/11/13 07:37 AM)
_________________________
2010 Accord-LX K24: PU 5w30
2009 Subaru Forester 2.5X: Castrol 0w30
1990 Chevy K1500 350TBI: Frankenbrew
2008 Ruckus 50ccGET: M1R Mix

Top
#3213126 - 12/11/13 07:36 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
JHZR2 Offline



Registered: 12/14/02
Posts: 35089
Loc: New Jersey
I'd like to see a UOA to identify if it is possibly a viscosity and/or fuel related issue.

Top
#3213136 - 12/11/13 07:39 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
Donald Offline


Registered: 03/21/04
Posts: 14314
Loc: Upstate NY
I would say its more to a change in viscosity due to oxidation or shearing.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

Top
#3213144 - 12/11/13 07:55 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
demarpaint Offline


Registered: 07/03/05
Posts: 22223
Loc: NY
Another vote for the oil going out of grade, and has probably been in service a little too long. Either do a UOA and see what's going on, or shorten your OCI to the point just before the acoustics change.
_________________________
GOD Bless our Troops


Top
#3213163 - 12/11/13 08:20 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
BMWTurboDzl Offline


Registered: 04/15/10
Posts: 1456
Loc: Atlanta,GA
Update: The factory OCI is an approximate and was for reference purposes but regarding UOA the few out there show that BMW is about spot on. It's ready to be changed for sure at 10-13k miles.

Coincidentally I was planning to change this weekend. I like the mid cycle OCI but was curious if there is a chemistry change that is neither for the better or worse with 6500 miles on the oil.

Boundary layer re-applied at this mileage?

Remember this oil is 229.51/LL04 and I'm burning ULSD.

I'm at 56k miles and haven't done anything more than a factory fill UOA. I went full OCI once.


Edited by BMWTurboDzl (12/11/13 08:26 AM)
_________________________
'15 435i - Factory fill.
Prev
'10 335d
'06 330i
'03 330i

Top
#3213415 - 12/11/13 12:46 PM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
JR Offline


Registered: 08/08/04
Posts: 932
Loc: Michigan born but my heart bel...
Run full oci. my vw called for 7.5-10k oci's and that was in 1984 with dino oil. ran strong 6yrs ago at 380k and still going strong at over 400k.

ken

Top
#3213418 - 12/11/13 12:48 PM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
JR Offline


Registered: 08/08/04
Posts: 932
Loc: Michigan born but my heart bel...
Diesel put soot in oil so i wouldn't think the oil is thinning out. soot loading causes oil to thicken up.

Ken

Top
#3215102 - 12/13/13 01:36 AM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
Ducked Offline


Registered: 10/25/12
Posts: 217
Loc: Taiwan
Any objective evidence for the change?

I'm not implying that a subjective assessment is necessarily wrong, just wondering if analysis of a sound recording would yield hard evidence.

Could be a whole new field of obsession. grin

Top
#3215285 - 12/13/13 08:30 AM Re: ~6500 miles acoustics of engine change. [Re: Ducked]
BMWTurboDzl Offline


Registered: 04/15/10
Posts: 1456
Loc: Atlanta,GA
Originally Posted By: Ducked
Any objective evidence for the change?

I'm not implying that a subjective assessment is necessarily wrong, just wondering if analysis of a sound recording would yield hard evidence.

Could be a whole new field of obsession. grin


Hehe...probably would, but it would be hard for the lay person to get the variables right. It's a slight change in sound. Doesn't go from quiet to hearing valves tapping.

We hear about oils cleaning and re-applying boundary layers so I was wondering if it was at this mileage that my oil started to do it.
_________________________
'15 435i - Factory fill.
Prev
'10 335d
'06 330i
'03 330i

Top
#3275089 - 02/08/14 05:20 PM Re: ~6500 miles acoustics of engine change. [Re: BMWTurboDzl]
outdoorsman310 Offline


Registered: 08/26/13
Posts: 113
Loc: DE
I would change the oil. I see no reason to go that long on an oil change. oil is cheap. engines are not

Top
#3366169 - 05/08/14 11:21 PM Re: ~6500 miles acoustics of engine change. [Re: JHZR2]
Kuato Offline


Registered: 10/23/05
Posts: 3466
Loc: Houston TX for the moment
Originally Posted By: JHZR2
I'd like to see a UOA to identify if it is possibly a viscosity and/or fuel related issue.


This. I'd be changing and checking it the moment the noises changed.
_________________________
Amsoil


04 Jeep Wrangler 2.4 MT 186k
F150 stolen, Subaru Outback Premium arrives mid March


Top