Help !!.... What is this sound ?
#1
Member
Thread Starter
Help !!.... What is this sound ?
My 05 E55 (47K miles) has developed a Whirring sound on cold Startups'. This began happen after an oil change at the Stealership. The sound seems to quieten down after about a minute of running, but its still there.
I have since changed the Oil myself (Mobil 1 0w-40) swapping filters between Mann and Purepower metal filter. No change. The pulley's are all good.
I was told by a mechanic friend that this is due to the gears in the oil pump and that its common, but I'm not sure about his diagnosis. Sounds pretty bad to be a common occurrence.
Has anyone here heard this before or know what could cause this ?
I have since changed the Oil myself (Mobil 1 0w-40) swapping filters between Mann and Purepower metal filter. No change. The pulley's are all good.
I was told by a mechanic friend that this is due to the gears in the oil pump and that its common, but I'm not sure about his diagnosis. Sounds pretty bad to be a common occurrence.
Has anyone here heard this before or know what could cause this ?
Last edited by ryanhere; 05-16-2017 at 02:37 PM.
#4
Member
that is absolutely the oil pump per your mechanic... remember there are iirc 6 metal gears in the oil pump....new and or different oil makes a difference....for instance.. when i use mobile 1 0 40.. it is the loudest....when i switched to bizol.. is was non existent.. i just switch back to the mobile 1 m formula 5 40 and its back louder again.... there are no issues that you have so rest easy...
The following users liked this post:
ryanhere (05-25-2017)
#5
Member
Thread Starter
Where did you obtain Bizol ? Can you please post the link ?
What spec oil did you use ?
Got it:
https://www.eeuroparts.com/Parts/869...rotect-B75511/
What spec oil did you use ?
Got it:
https://www.eeuroparts.com/Parts/869...rotect-B75511/
Last edited by ryanhere; 05-16-2017 at 08:22 PM.
#6
Member
Thread Starter
Ok.. I put in Bizol 0-40 and like mentioned by fergsc32 , the sound magically went away.
so what gives? I always thought Mobil 1 0w-40 was the gold standard, but I think not after this experience.
so what gives? I always thought Mobil 1 0w-40 was the gold standard, but I think not after this experience.
#7
Member
Not a fan of M1 oil......last change was Royal Purple which seems ok but think I will try Amzoil or Liquid Moly next time around......
Trending Topics
#9
Super Member
#11
i allways had this same noise. On mobil 1 its loudest, now went with liquily moly leichtlauf 5w-40. its not as loud but def there. Can you take a video now with the bizoil? Cold start plz and after a while!
#12
MBWorld Fanatic!
Sounds normal, a lot of cars do that at cold start. Nice cobra tank, have you felt any difference with it on?
#13
Member
Thread Starter
Here is the sound post Bizol oil change. No whirring noise. The cobra tank really helps IAT Temps. With dual H/E I see Approx 8-10 f above ambient while cruising and a 30-35f temp jump at WOT