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2006 Infiniti M45. Did an oil change to Mobil1 synthetic and now the car is making a loud knocking sound at startup.

Customer Question
170K miles The car have been...
2006 Infiniti M45. Did an oil change to Mobil1 synthetic and now the car is making a loud knocking sound at startup. 170K miles
The car have been maintained accordingly by the dealership.
Submitted: 1 year ago.Category: Infiniti
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Answered in 1 minute by:
6/26/2016
Infiniti Mechanic: Gary, Technician replied 1 year ago
Gary
Gary, Technician
Category: Infiniti
Satisfied Customers: 17,506
Experience: GM master tech for 15 years/ASE master tech for 20 years
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what oil was being used before and what weight oil ? was it full synthetic ?

what weight synthetic oil did you pout in it ?

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Customer reply replied 1 year ago
Dealer normally used Mobil 5w30I tried Royal Purple 5w30 for the first time.
Infiniti Mechanic: Gary, Technician replied 1 year ago

if your using the correct weight oil which you are can you tell me how long will the knocking sound last ?

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Customer reply replied 1 year ago
When I start the car it is very loud and doesn't stop. So I haven't let it run for more than 2 minutes.
Infiniti Mechanic: Gary, Technician replied 1 year ago

what brand filter vs what the dealer is using for an oil filter ? and the oil is full on the engine oil dipstick i am assuming ?

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Customer reply replied 1 year ago
Oil level is fine. Always checked normally. K&N Oil Filter.Oil level is full. No engine lights or sensors are blinking, but is sounds just like this link
https://www.youtube.com/watch?v=A32KioBnvlc
Infiniti Mechanic: Gary, Technician replied 1 year ago

if it was not doing this before the oil change get a dealer oil filter and change the oil filter out with the dealer brand and the oil if 5W30 should be just fine in this engine

if it still makes this noise have the dealer listen with a stethoscope to narrow down the noise area of a bottom end possible bearing causing this noise or a lifter or valve train issue

we have had oil filters cause this kind of issue so its worth a shot to try if the noise is still there then it is very bad timing of an internal engine failure of a bearing or valve train part or lifter

but in a nut shell you did not do anything wrong at all

you can always get me back for FREE for any follow up any time with this question even after you rate me here at Justanswer

if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer

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Customer reply replied 1 year ago
Just don't want to think that I would have to replace the engine.
Infiniti Mechanic: Gary, Technician replied 1 year ago

i agree with you

but if it was not doing it before and you are 100 % sure it was NOT doing this before then its the filter or real bad timing for any kind of engine failure

you can always get me back for FREE for any follow up any time with this question even after you rate me here at Justanswer

if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer

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Customer reply replied 1 year ago
No. The service rep even mentioned that the car is still like new. They have serviced for 10 years. The valves always seemed a little noisy, but never nothing like this.
Infiniti Mechanic: Gary, Technician replied 1 year ago

try the filter and if it still this noisy tow it to the dealer

you can always get me back for FREE for any follow up any time with this question even after you rate me here at Justanswer

if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer

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Gary
Gary
Gary, Technician
Category: Infiniti
Satisfied Customers: 17,506
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