Hi, everyone. I’ve tried explaining this to mechanics and they’ve all looked at me like I’m nuts. Finally, though, I have a video (should be attached to this). This is a hard phenomenon to emulate at a repair shop because it only happens the day after doing an hour (or more) of highway driving. It won’t happen while doing the driving, like if I stop at a gas station for a minute. I’ve got to do the driving, park at my destination, let a good amount of time go by (e.g. overnight) and then start my car. The smoke smells burnt, not sweet, and lingers in the air if it’s not windy.
I’m definitely losing oil, but I’m not sure if it’s a steady leak or if it’s worse in certain circumstances. My engine makes obnoxious noises that used to be intermittent but are now standard… and they’re hard to describe. While driving, from inside the car it’ll sound “rough”. When I punch it, like when speeding up to go onto a highway, it’ll go away… until I stop accelerating, and then it’ll come back (and sounds like it’s related to RPM’s… like it changes as the automatic transmission shifts). Sometimes a thing will happen where after about 30 minutes of consistent driving at 55+ mph, my engine will make a rapid clicking noise, like the freewheel clicking of a bicycle, and this fluctuates w/ acceleration. I can make it stop by pulling over, stopping my car, waiting about 10-15 seconds, and starting back up. Sometimes it’ll just decrease in intensity, but all I have to do is shut off my car and restart again and it’s gone. I suspect that all these strange engine behaviors are connected to the day-after-highway-driving-smoke in the attached video.
My car is a 2000 Infiniti I30 with about 175k miles on it. Thanks!