Sudden oil consumption after RB replacement

Helmsman · 07-20-2018, 03:58 PM

Hi guys,

as mentioned here (https://www.m3post.com/forums/showth...253084&page=34) I had my rod bearings replaced.

My engine have never consumed a measurable drop oil between 5k oil changes over 26k miles. On my way down from the shop (230 miles) it suddenly did. Nothing alarming and need to work out details overtime but maybe in the range of 0.3-0-4 liter. I measured both with Carly (which gives a better resolution when it drops) and the cluster. Bit more the first hour to slow down as it seemed.

The oil is the same Shell 10W60 I always used (this was called "Supercar" but speced for M cars etc). 9 liter was filled originally, showing half bar. I topped up when down to 1/4. The new bearngs (ACL HX) have more clearance. FWIF the temp was a tad lower (2-3C) on high way after the change which I thought was nice.

I can't understand what the rod bearings should have to do at all with the oil consumption, maybe some of the experts can chime in on this?

I also wonder if anybody else have noticed an increased oil consumption after RB replacement?

UPDATE 27th July:
After driving a few days the level seems to have stabilized. Hence you guys where right, after complete drain it takes a little while and top up. Will probably end up filling a good 9.7-9.8 liter to hit Max.

Thanks

Thanks!

pbonsalb · 07-20-2018, 04:17 PM

If it was in the first 200 miles after an oil change , I would pay no attention since the sensor takes a while to read accurately. If you really are using 1L per 1000 miles you will know soon enough. That would be pretty high for street driving.

Helmsman · 07-20-2018, 04:21 PM

Thing is that I've done 5 changes since I got the car and it never consumed anything, I'm talking rock stable. Sensor has always been fine, reflecting a tad low filled while coming up straight after top up. It it a bit strange actually.

///M Power-Belgium · 07-20-2018, 05:07 PM

Quote:

Originally Posted by Helmsman

Hi guys,

as mentioned here (https://www.m3post.com/forums/showth...253084&page=34) I had my rod bearings replaced.

My engine have never consumed a measurable drop oil between 5k oil changes over 26k miles. On my way down from the shop (230 miles) it suddenly did. Nothing alarming and need to work out details overtime but maybe in the range of 0.3-0-4 liter. I measured both with Carly (which gives a better resolution when it drops) and the cluster. Bit more the first hour to slow down as it seemed.

The oil is the same Shell 10W60 I always used (this was called "Supercar" but speced for M cars etc). 9 liter was filled originally, showing half bar. I topped up when down to 1/4. The new bearngs (ACL HX) have more clearance. FWIF the temp was a tad lower (2-3C) on high way after the change which I thought was nice.

I can't understand what the rod bearings should have to do at all with the oil consumption, maybe some of the experts can chime in on this?

I also wonder if anybody else have noticed an increased oil consumption after RB replacement?

Thanks!

Last week I had an oil change at my local BMW/Dealer . 8.8 liter was filled with the 10W60 BMW ///M Twin Power Turbo oil , and my oil filter is also replaced.

My oil level reading with 8.8 liter is at 80% . So your half bar , and down to 1/4 reading with 9 liter is/was actually pretty low .

dparm · 07-20-2018, 05:30 PM

230 miles is not enough to indicate anything. If the level continues to fall over the next 1,000 miles, then maybe I'd say something is amiss.

Helmsman · 07-20-2018, 05:31 PM

Phil, keep in mind the engine drains with the sump off for 24h. There is a tad more oil coming out then compared to a normal oil change. Read that 9.5l is fair after RB change. As we started at 9l flat I believe half bar (31.46 on Carly) is pretty accurat.

The surprise is that it all of a sudden fell from there. Ah well, lets see if some of guys that changes shells chime in.

Cheers

///M Power-Belgium · 07-20-2018, 05:53 PM

Quote:

Originally Posted by Helmsman

Phil, keep in mind the engine drains with the sump off for 24h. There is a tad more oil coming out then compared to a normal oil change. Read that 9.5l is fair after RB change. As we started at 9l flat I believe half bar (31.46 on Carly) is pretty accurat.

The surprise is that it all of a sudden fell from there. Ah well, lets see if some of guys that changes shells chime in.

Cheers

Yeah I know .Your oil reading went down from half to 1/4 in 230 miles .
If your car is asking for oil again in the next 500/1000 miles . Something is wrong.
Meanwhile I would drive it like usual . But keep an eye on it...

roastbeef · 07-20-2018, 06:21 PM

don't sweat it until after your next oil change. a bearing change doesn't touch anything that consumes oil.

pbonsalb · 07-20-2018, 09:52 PM

Quote:

Originally Posted by Helmsman

Phil, keep in mind the engine drains with the sump off for 24h. There is a tad more oil coming out then compared to a normal oil change. Read that 9.5l is fair after RB change. As we started at 9l flat I believe half bar (31.46 on Carly) is pretty accurat.

The surprise is that it all of a sudden fell from there. Ah well, lets see if some of guys that changes shells chime in.

Cheers

No difference for me before and after changing rod bearings. Let us know in 2-3k miles whether your consumption has definitively increased.

Helmsman · 07-21-2018, 02:38 AM

Cheers guys. Certainly aware of that the sensor can play trick but as mine has worked fine for years this made me wonder.
I'll enjoy my new bearings for a few days and report back.

pbonsalb · 07-21-2018, 06:27 AM

The oil fed to the bearings is recycled to the pan and pump pickup so I am having a hard time understanding how changing rod bearings affects oil consumption.

last1left · 07-21-2018, 07:35 AM

Helmsman maybe post this in the RB replacement thread to see if others have experienced the same.

///M Power-Belgium · 07-21-2018, 08:31 AM

Quote:

Originally Posted by last1left

Helmsman maybe post this in the RB replacement thread to see if others have experienced the same.

He has done it . In # 745 and further => https://www.m3post.com/forums/showth...253084&page=34

last1left · 07-21-2018, 08:54 AM

Quote:

Originally Posted by ///M Power-Belgium

He has done it . In # 745 and further => https://www.m3post.com/forums/showth...253084&page=34

Thanks.

kyrix1st · 07-21-2018, 09:09 AM

Quote:

Originally Posted by pbonsalb

If it was in the first 200 miles after an oil change , I would pay no attention since the sensor takes a while to read accurately. If you really are using 1L per 1000 miles you will know soon enough. That would be pretty high for street driving.

I use about 1L/1000km when I drive like an idiot. ~2000km if I baby it. Consumption rate interestingly was higher during highway driving.

tdott · 07-24-2018, 11:51 AM

I've noticed some wanky readings after RB jobs, most cars bounce around a little before settling after a bit of driving. With the pan off more oil than normal comes out.

Continue to monitor it, but I doubt there is any cause for concern right now.

bigjae1976 · 07-24-2018, 05:03 PM

I had to add some oil twice after rod bearings within the first 2k miles. Haven't had to add any since.

Helmsman · 07-25-2018, 01:20 AM

tdott, big, appreciate your inputs. This is probably what I see as well.

Cheers

Helmsman · 07-27-2018, 06:15 AM

After driving a few days the level seems to have stabilized. Hence you guys where right, after complete drain it takes a little while and top up. Will probably end up filling a good 9.7-9.8 liter to hit Max.

Thanks

bigjae1976 · 07-27-2018, 08:24 AM

Quote:

Originally Posted by Helmsman

After driving a few days the level seems to have stabilized. Hence you guys where right, after complete drain it takes a little while and top up. Will probably end up filling a good 9.7-9.8 liter to hit Max.

Thanks

Sounds about right.

kyoo · 07-27-2018, 09:56 AM

whew glad i read to the end.

OP, just a gentle suggestion, may be good to update your first post w/ date to reflect that the oil level has now settled?

Helmsman · 07-27-2018, 10:17 AM

Quote:

Originally Posted by kyoo

whew glad i read to the end.

OP, just a gentle suggestion, may be good to update your first post w/ date to reflect that the oil level has now settled?

Thanks mate - done

07-20-2018, 03:58 PM	#1
Helmsman Major General 4441 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Sudden oil consumption after RB replacement Hi guys, as mentioned here (https://www.m3post.com/forums/showth...253084&page=34) I had my rod bearings replaced. My engine have never consumed a measurable drop oil between 5k oil changes over 26k miles. On my way down from the shop (230 miles) it suddenly did. Nothing alarming and need to work out details overtime but maybe in the range of 0.3-0-4 liter. I measured both with Carly (which gives a better resolution when it drops) and the cluster. Bit more the first hour to slow down as it seemed. The oil is the same Shell 10W60 I always used (this was called "Supercar" but speced for M cars etc). 9 liter was filled originally, showing half bar. I topped up when down to 1/4. The new bearngs (ACL HX) have more clearance. FWIF the temp was a tad lower (2-3C) on high way after the change which I thought was nice. I can't understand what the rod bearings should have to do at all with the oil consumption, maybe some of the experts can chime in on this? I also wonder if anybody else have noticed an increased oil consumption after RB replacement? UPDATE 27th July: After driving a few days the level seems to have stabilized. Hence you guys where right, after complete drain it takes a little while and top up. Will probably end up filling a good 9.7-9.8 liter to hit Max. Thanks Thanks! Last edited by Helmsman; 07-27-2018 at 10:16 AM..
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07-20-2018, 04:17 PM	#2
pbonsalb Lieutenant General 5216 Rep 10,601 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	If it was in the first 200 miles after an oil change , I would pay no attention since the sensor takes a while to read accurately. If you really are using 1L per 1000 miles you will know soon enough. That would be pretty high for street driving.
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07-20-2018, 04:21 PM	#3
Helmsman Major General 4441 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Thing is that I've done 5 changes since I got the car and it never consumed anything, I'm talking rock stable. Sensor has always been fine, reflecting a tad low filled while coming up straight after top up. It it a bit strange actually.
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07-20-2018, 05:30 PM	#5
dparm Stop the hate, get a V8 3850 Rep 8,625 Posts Drives: C7 Corvette GS, AMG C63 S Join Date: Jun 2013 Location: Frisco, TX iTrader: (1)	230 miles is not enough to indicate anything. If the level continues to fall over the next 1,000 miles, then maybe I'd say something is amiss. __________________ Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan Past: 2011.5 M3 sedan ZCP
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07-20-2018, 05:31 PM	#6
Helmsman Major General 4441 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Phil, keep in mind the engine drains with the sump off for 24h. There is a tad more oil coming out then compared to a normal oil change. Read that 9.5l is fair after RB change. As we started at 9l flat I believe half bar (31.46 on Carly) is pretty accurat. The surprise is that it all of a sudden fell from there. Ah well, lets see if some of guys that changes shells chime in. Cheers
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07-20-2018, 06:21 PM	#8
roastbeef Lieutenant General 11582 Rep 12,723 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	don't sweat it until after your next oil change. a bearing change doesn't touch anything that consumes oil. __________________ Instagram; @roastbeefmike
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07-21-2018, 02:38 AM	#10
Helmsman Major General 4441 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Cheers guys. Certainly aware of that the sensor can play trick but as mine has worked fine for years this made me wonder. I'll enjoy my new bearings for a few days and report back.
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07-21-2018, 06:27 AM	#11
pbonsalb Lieutenant General 5216 Rep 10,601 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	The oil fed to the bearings is recycled to the pan and pump pickup so I am having a hard time understanding how changing rod bearings affects oil consumption.
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07-21-2018, 07:35 AM	#12
last1left Lieutenant 175 Rep 450 Posts Drives: e92 M3 Join Date: May 2013 Location: West Coast iTrader: (0)	Helmsman maybe post this in the RB replacement thread to see if others have experienced the same.
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07-24-2018, 11:51 AM	#16
tdott Brigadier General 3938 Rep 3,980 Posts Drives: M3 Join Date: Nov 2010 Location: South FL / 6ix iTrader: (4)	I've noticed some wanky readings after RB jobs, most cars bounce around a little before settling after a bit of driving. With the pan off more oil than normal comes out. Continue to monitor it, but I doubt there is any cause for concern right now. __________________ N/A S65 Headers Before/After Dyno Results
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07-24-2018, 05:03 PM	#17
bigjae1976 Major General 1570 Rep 8,075 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [4.50] 2011 BMW E90 M3 [5.25] 2013 BMW 328i [5.00]	I had to add some oil twice after rod bearings within the first 2k miles. Haven't had to add any since. __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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07-25-2018, 01:20 AM	#18
Helmsman Major General 4441 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	tdott, big, appreciate your inputs. This is probably what I see as well. Cheers
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07-27-2018, 06:15 AM	#19
Helmsman Major General 4441 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	After driving a few days the level seems to have stabilized. Hence you guys where right, after complete drain it takes a little while and top up. Will probably end up filling a good 9.7-9.8 liter to hit Max. Thanks
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07-27-2018, 09:56 AM	#21
kyoo Captain 341 Rep 744 Posts Drives: Evo Join Date: Feb 2010 Location: USA iTrader: (0)	whew glad i read to the end. OP, just a gentle suggestion, may be good to update your first post w/ date to reflect that the oil level has now settled?
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