Recent Topics
killing weeds without poisoning well
by oilboy123
Today at 01:27 AM
1999 ford expedition factory mercon v synthetic??
by merconvvv
Yesterday at 11:40 PM
Buick 3800 - "Von Voyage" oil change?
by Alex_V
Yesterday at 10:41 PM
Low oil level light on, but level not THAT low....
by gregk24
Yesterday at 10:26 PM
Is SuperLube syn multi grease universal
by NattyBoh
Yesterday at 10:05 PM
How come discount tire doesn't use jack stands?
by motor_oil_madman
Yesterday at 09:41 PM
SAFETY ?: ramps in rear and jack stands in front
by SavagePatch
Yesterday at 09:03 PM
Pennzoil ultra 5w30 back in stock at Walmart.com
by kohnen
Yesterday at 08:37 PM
Homelite weedeater not getting fuel
by Drew99GT
Yesterday at 08:26 PM
Stability issue on 2015 F250
by Donald
Yesterday at 07:25 PM
2016 Tacoma 3.5L V6 4x4
by NavyVet88
Yesterday at 07:10 PM
Question on 05 Nissan tranny w/120k
by NattyBoh
Yesterday at 06:58 PM
Newest Members
Matt_P, tpragski, 182RG, BillHuang, jwilliamson185
58578 Registered Users
Who's Online
31 registered (Delta, Bandito440, Charlie1935, andrewp1998, b1amgm47, 1foxracing, 5 invisible), 630 Guests and 7 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58578 Members
66 Forums
252174 Topics
4135180 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: 1729
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 - BMW branded Shell 5w30.
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 Offline


Registered: 05/25/05
Posts: 8622
Loc: Western 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"
'80 Firebird FORMULA V8/4bbl-NEW
'06 Mazda 3i 2.0L-Pre Owned
'15 Nissan Altima 2.5 SV-CPO
Still looking for a car for my wife(new, used, CPO)

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


Registered: 05/01/12
Posts: 2063
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: M1 TDT
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: 38258
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: 17037
Loc: Upstate NY
I would say its more to a change in viscosity due to oxidation or shearing.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2001 Jeep Grand Cherokee Laredo 4.0- sold
1999 Dodge Ram 2500 w/Cummins- 4-sale


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


Registered: 07/03/05
Posts: 25356
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: 1729
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 - BMW branded Shell 5w30.
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: 1249
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: 1249
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: 994
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: 1729
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 - BMW branded Shell 5w30.
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: 5280
Loc: In transit...
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.
_________________________
Your oil's condition is speculation until you get a UOA done.

2013 F150, 5.0 4x4, 52k Schaeffer 9000


Top