Originally Posted By: Mathew_Boss
For my Mitsubishis, it wasn't so much normal driving was nosier but if you got on the throttle while it was cold it would let out a death squeal that I can only equate to when you drive a HMMWV down the highway and the cooling fan kicks on. Neither the Lancer or Mirage ever squealed with PUP or Castrol Extended Performance. (Cold is anything below freezing) It was 23 out this morning and about 5 min after coming out of my driveway I had her cranking 6k RPM and no squeal. I'm happy so far.
Yeah, I believe the noise that really caught my ear came when the car was not fully warm and I would give it a little gas to hit a gap in traffic or whatever (not going WOT with a cold car, of course) and then ease off suddenly, maybe because the car in front of me slowed down unexpectedly...I heard a pronounced rattle with the EP that I had never heard before and it really made me uncomfortable. Same filter as always and the oil was basically right on the full line.
Didn't use the EP in my last change and I haven't noticed the noise...could have been totally unrelated to the oil, of course, but it was definitely different from what I was used to and not a particularly subtle thing. Sort of like when I tried M1 5W30 ESP and thought my car was having a coolant issue because my oil temp monitor was reading up to 10F higher than "normal" (I always have oil temp on my programmable readout)...some folks on here helped me realize that was totally normal with a higher HTHS oil and I learned to not worry about that one.