Momentary Engine Knock after Oil Change

JRed

Site Donor 2021
Messages
2,329
Location
Virginia
Yeah, it's normal. Some cars do it and some don't. My Subaru and Mirage don't - my grandparents Buick, uncle's F250, and both work trucks "knock" for two or three seconds after an oil change (even with the filter filled). I wouldn't worry about it.
 

bigsplash

Thread starter
Messages
45
Location
North of the 49th parallel
I remember an old mechanic once telling me that he can tell a lot about an engine's general condition, by listening to how it sounds right after an oil change. What exactly he was listening for I don't know, sure hope it wasn't for an engine knock. The guy was an old timer and had an answer for everything, usually was always right too.
 
Messages
35,818
Location
NY
Some engines do this. Try filling the filter a bit more. I pre-fill the filter at the start of the OC, and install the filter last. During that time the level in the filter drops, so I add more oil to it. Try doing that next time if you aren't doing it now. In some cases what looks like a half filled filter after the oil is poured in, is a quarter filled about 10 minutes later.
 
Messages
2,789
Location
California, USA
Another vote for it just happens on some engines. Never happened with my Civic, happens every time with my wife's Mazda3. I don't think it happens on our Suburban but I haven't noticed either way.
 
Messages
4,653
Location
The Garden State
I don't prefill my oil filters, they mount horizontally. I have a brief 1 or 2 second noise at intitial start up after an oil change. Nothing to worry about. When I was using Fram's OCoD and it clacked on every start up and lasted more than a second or two, that's when to worry about wear. Whimsey
 
Messages
8,598
Location
Florida
Usually I hear this on OHV engines with hydraulic lifters. When hydraulic lifters don't have enough oil in them, they act like solid lifters that are far out of adjustment.
 
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