M104 Cold start knock after an oil change
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91' 300sl
M104 Cold start knock after an oil change
Hey All,
M104.98, 99K miles.
About a month ago I changed my oil from a "cheap" non brand full synthetic 5W-30 to MB 229.5 5W-40 full syn oil along with an MB original filter. At the first cold start after the oil change, I noticed a Knock that will disappear after 3-5 seconds and is not present after. (as oil pressure builds up). I then changed my oil, this time using the Chevron-Delo 400 15w-40 (along with an MB original filter). The knock is still present.
Oil pressure readings:
Cold idle - "3"
Warm idle - "2"
Light acceleration - a tick below "3"
Harder acceleration - "3"
No other drivability issues whatsoever.
Is it a lifter bleeding overnight? or a timing tensioner losing oil pressure and therefore tension..? (does not sound like a chain slap, right?)
some videos..
Thanks
M104.98, 99K miles.
About a month ago I changed my oil from a "cheap" non brand full synthetic 5W-30 to MB 229.5 5W-40 full syn oil along with an MB original filter. At the first cold start after the oil change, I noticed a Knock that will disappear after 3-5 seconds and is not present after. (as oil pressure builds up). I then changed my oil, this time using the Chevron-Delo 400 15w-40 (along with an MB original filter). The knock is still present.
Oil pressure readings:
Cold idle - "3"
Warm idle - "2"
Light acceleration - a tick below "3"
Harder acceleration - "3"
No other drivability issues whatsoever.
Is it a lifter bleeding overnight? or a timing tensioner losing oil pressure and therefore tension..? (does not sound like a chain slap, right?)
some videos..
Thanks
Last edited by mrSL; Dec 28, 2017 at 09:48 AM.
