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Have a 2004 Cayenne with 167K on the odo. Recently purchased. Very clean car (pristine!), all service records, and oil changes every 5K miles for entire history of the car. I recently changed the oil to M1 0W40, and noticed that the engine sounds louder, more valve train noise. Yesterday, my friend who has a 2006 Cayenne, noticed that I have a light knocking sound coming from the right center of the block (I never noticed it). It's an intermittent light knock that's hard to notice at first, but once you hear it, you can tell it's consistent -- knocking every few revolutions, but again hard to notice unless you're really trying to hear it.
Before I changed the oil, I noticed that the previous fill was a pretty thick consistency, clinging to the dipstick (the car was much quieter before). The previous oil was a 5w40 based on previous records I have. The M1 0w40 that I just put in is very thin, and just drips off the dipstick and is hard to see. My oil level is a bit high, I probably overfilled it by half a quart, it comes up to the top of black plastic gauge just past the Max mark.
Dreading the diagnosis of possible cylinder scoring, I would like to find a solution that could allow me to drive for a while before I have to rebuild or replace the motor.
My plan of action is to immediately change the oil to 5w40 Red Line. (I recently replaced the front diff, rear diff, and transfer case fluids with Red Line fluids.)
What suggestions do you have for plan of action, or solutions to prevent further damage if the lubrication is the culprit? Maybe this is misfire. The car has plenty of power and I've had no other issues.
BTW, I did the Turbo instrument panel upgrade and now love the color display on my S. Since this car is in absolutely new condition externally and interior, I would like to keep it driving it.
Thanks in advance for any advice.
Just to add, when I blip the throttle at idle, I can hear what sounds like a pop noise sometimes coming from the engine bay. Almost like a rich condition causing backfire.
I have an 03 Boxster with 95k on the clock.
When you first start driving the car, everything is tight and quiet. After about 25 - 30 miles, the front start to knock lightly and rumble. Most noticeable between 0 and 30mph in queuing traffic. You can feel the knocks on the steering wheel and brake pedal. The further you go the worse it gets. The sound is like a bolt being jarred in a plastic bottle.
Up to now it has had new bake disks and pads. Track rod ends and wishbones replaced and something That looks like coffin struts changed. Wheels and tyres have been checked. When the knocking started, the brake warning light came on. The front sensors have been changed so the warning lights don't come on when the knocking starts.
I am not mechanically minded but In my mind its a brake problem as the issue only shows up after driving for about 30 miles and things are starting to warm up.
The garage cannot identify the issue and have run out of ideas. Can anyone suggest or identify the problem as I have been replacing bits without success