Join Date: Mar 2013
Location: University Place
Oil change, but louder?
OK, here is the deal. After hitting 200k, I figured I would do some things to enhance the protection of my 1997 4.0 I6 engine a bit.
First thing I did was ran a Seafoam treatment. Worked beautifully. Lots of crap came out the tailpipe, and I swear it feels like I regained about 10 HP. I ran the Seafoam in my oil for about 100 miles, and when I changed it, it looked like diesel oil, nice and black. No odd problems there. I normally run conventional 10w30. And there is usually a tiny lifter tick that is just always there. And a wee bit of knocking on cold start acceleration. (I have never had a problem, it's just a noisy engine)
But when I did the change, I switched to 10w40, and added a quart of Marvel Mystery Mystery Oil. And now on startup, it sounds like a diesel engine. Like I can hear every part in the top end rattling and moving. WAY louder then it was before. It goes away after a couple minutes, but the ticking while running warm has now changed to a more hollow sounding clack.
So my questions are thus: Should I be worried? I am used to my 4.0 making noise, but this seems excessive. All the stuff I have read on here suggested that 10w40+MMO would be a better choice for a higher mileage engine. And has anyone else had this issue?