sneakingfart
OBS Enthusiast
Hi all, quick question. Have a 1999 Suburban with 185k miles. Runs very well, makes good power from what I can tell, but I only had this truck for around a year. Now that it's colder outside, I'm hearing a light knocking noise on initial engine startup in the morning. Lasts for about a minute, quiet enough to where you may not even notice it if you aren't paying attention, does get a little louder and faster with increase in RPMs. But really, by the time I pull out of the driveway, it's gone. This morning was about 27 degrees outside and it was more noticeable. No issues at all when ambient temps are warmer. I read on here that similar issues attributed to piston slap and seems fairly common. Is this anything to worry about? Thanks.
Edit: forgot to mention, oil pressures are normal, oil is Amsoil 5w30. No issues at all about 30 seconds to a minute after starting.
Edit: forgot to mention, oil pressures are normal, oil is Amsoil 5w30. No issues at all about 30 seconds to a minute after starting.