Results 1 to 12 of 12

Thread: Anyone done engine flushing?

  1. #1
    Join Date
    Apr 2020
    Location
    Orange County, CA
    Posts
    619
    My Cars
    2000 740i/2003 530i

    Anyone done engine flushing?

    Bought myself liquimoly engine flushing liquid.
    https://www.liqui-moly.com/en/us/pro...L9efD_BwE#2037

    Was wondering if itís worth doing it on a 160,000 mile M62 motor with a bunch of varnish and sludge? I managed to remove all of the black sludge manually with a plastic scraper when the valve cover was off. Iíve read some positive and negative things about doing this and would like the feedback or suggestions from everyone here.

  2. #2
    Join Date
    May 2018
    Location
    Austin, TX
    Posts
    721
    My Cars
    2003 540i | NSX | CB550
    That stuff might work on sludge but it does absolutely nothing for heavy varnish. I did it religiously with every oil change for a while but gave up when I saw no noticeable differences under the valve cover after 3-4 applications. My engine was mostly just varnished though with very little sludge.
    Last edited by MotorMouth93; 03-01-2023 at 03:36 AM.

  3. #3
    Join Date
    Jun 2013
    Location
    Boston, MA
    Posts
    1,046
    My Cars
    99 528i/5, 05 ZHP conv
    There has been quite a bit of discourse on this topic among the E46 crowd in the he M54 engine.
    This method has been shown to clear sludge and carbon and to reduce oil consumption from clogged rings.

    See post# 4
    https://www.e46fanatics.com/threads/...ption.1259657/

  4. #4
    Join Date
    Mar 2007
    Location
    Middle of a corn field
    Posts
    14,550
    My Cars
    E39 hamster/ruberbandPWR
    I have used the Liqui-Moly stuff , and the Amsoil engine flush as well .
    I don't know if it is doing much , but I try ... lol .

    Looking for an E39 belly pan , passenger front inner fender liner Ö

  5. #5
    Join Date
    Jul 2019
    Location
    Denver, CO
    Posts
    96
    My Cars
    1997 BMW 540i
    Yes. I add the detergent around 500 miles out from an anticipated oil change. It seems to help with ticking lifters. My E39 sits allot, particularly during winter months, and if Im not diligent about the occasional engine start the lifters dry and stick; why I started.

  6. #6
    Join Date
    Jul 2012
    Location
    mitten
    Posts
    3,715
    My Cars
    525it,02 525it,73 2002
    Tried Liqui Moly once . I wasn't all that impressed or my motor wasn't as dirty as I thought it was.
    New Castrol every 5k and maybe a quart added and were good.


  7. #7
    Join Date
    Apr 2020
    Location
    Orange County, CA
    Posts
    619
    My Cars
    2000 740i/2003 530i
    Quote Originally Posted by MotorMouth93 View Post
    That stuff might work on sludge but it does absolutely nothing for heavy varnish. I did it religiously with every oil change for a while but gave up when I saw no noticeable differences under the valve cover after 3-4 applications. My engine was mostly just varnished though with very little sludge.
    Oh man, I do have quite a bit of varnish inside. Looks almost like rust. I might just use the engine flush for the little bits of sludge I saw and then drain it out when the car is warm to let it flow (bless my hands from being burned). If I do it, should I remove the whole oil pan? Or should I just be fine draining from the oil pan itself?

  8. #8
    Join Date
    Mar 2012
    Location
    Lansdale, Pa
    Posts
    6,941
    My Cars
    98 540 6, SC'ed, 16psi
    Personally I would not do an engine flush for visible varnish unless there was another issue with the engine. The oil consumption due to stuck low tension rings or possibly an oil galley check valve malfunction, etc. issue, then I would consider it as a possible remedy for those issues. Many threads that show it can help for those type of problems. For a healthy running engine, the brown color on the internal parts does no real harm. All the machined surfaces where the oil does its work (where you cant see) are more than likely just fine and shiny clean. I wonder if introducing the flush on a healthy running engine could cause more issues than it solves as it could make some deposits come off in bigger pieces. I personally would use a high detergent dino oil with shorter change intervals to slowly remove varnish on a healthy running engine.
    98 540i 6, 525 whp, 120 mph 1/4, V3 Si S/C'er @16 psi, W/A I/C, Water/Meth, Supersprint Headers, HJS Cats, 3" Custom Exhaust, UUC Twin Disc, Wavetrac LSD, GC Coil Overs, Monoball TA, AEM FP, Aeromotive FPR, AEM Failsafe AFR/Boost, Style 65's w/275's, M5 Steering Box, Eibach Sways, M3 Shifter, Evans Coolant, 85 Deg Stat, PWM Fan, 10" Subs, B.A. speakers, Grom Aux/BT, Still Rolling as my DD!

  9. #9
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    1,456
    My Cars
    '02 540i-6, '97 540i-6
    +1
    Rotella 15W-40 was the original spec oil for the M62. I've also used it occasionally in my M62TU for this reason.
    Last edited by R Shaffner; 03-02-2023 at 12:25 PM.

  10. #10
    Join Date
    Dec 2010
    Location
    chi-town
    Posts
    383
    My Cars
    540i6 540iT 318ti

  11. #11
    Join Date
    Mar 2007
    Location
    Middle of a corn field
    Posts
    14,550
    My Cars
    E39 hamster/ruberbandPWR
    Quote Originally Posted by GZilla View Post
    Oh man, I do have quite a bit of varnish inside. Looks almost like rust. I might just use the engine flush for the little bits of sludge I saw and then drain it out when the car is warm to let it flow (bless my hands from being burned). If I do it, should I remove the whole oil pan? Or should I just be fine draining from the oil pan itself?
    Most flush stuffs require you to pour contents into crankcase , let idle for 10-15 minutes , then drain .
    I have to run a long 4" pvc pipe to exhaust out of the garage , because the engine will be burning the gunked crud out the exhaust when idling for 10-15 minutes .

    Looking for an E39 belly pan , passenger front inner fender liner Ö

  12. #12
    Join Date
    Apr 2020
    Location
    Orange County, CA
    Posts
    619
    My Cars
    2000 740i/2003 530i
    Quote Originally Posted by philly98540 View Post
    Personally I would not do an engine flush for visible varnish unless there was another issue with the engine. The oil consumption due to stuck low tension rings or possibly an oil galley check valve malfunction, etc. issue, then I would consider it as a possible remedy for those issues. Many threads that show it can help for those type of problems. For a healthy running engine, the brown color on the internal parts does no real harm. All the machined surfaces where the oil does its work (where you cant see) are more than likely just fine and shiny clean. I wonder if introducing the flush on a healthy running engine could cause more issues than it solves as it could make some deposits come off in bigger pieces. I personally would use a high detergent dino oil with shorter change intervals to slowly remove varnish on a healthy running engine.
    That is exactly what my dad told me as well. He said the varnish on the surface has no effect on performance and it's a normal thing for aging engines. Some other E38 owners showed me their exposed engines and with the oil pan removed and mine looks relatively clean. I just watched M539restoration's most recent video and he used the same engine flush and it seems like it didn't really help him with his varnish and his sludge. My engine runs fine and is relatively healthy. I might just not do it.

Similar Threads

  1. ENGINE FLUSH - Anyone actually done this?
    By Guru01 in forum 1996 - 2003 (E39)
    Replies: 81
    Last Post: 10-29-2019, 03:46 PM
  2. has anyone had their engine flushed?....
    By dieselm3 in forum General BMW and Automotive Discussion sponsored by Intercity Lines
    Replies: 4
    Last Post: 04-26-2004, 06:54 PM
  3. Anyone done a M30b35 engine swap?
    By bmwQ in forum 1983 - 1991 (E30)
    Replies: 5
    Last Post: 02-19-2004, 04:56 PM
  4. Has anyone done this engine mod?
    By proud D.O. in forum 1992 - 1999 M3 (E36)
    Replies: 6
    Last Post: 01-06-2003, 02:07 PM
  5. Has anyone done any custom engine painting?
    By berserkr in forum General BMW and Automotive Discussion sponsored by Intercity Lines
    Replies: 7
    Last Post: 12-09-2002, 02:16 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •