Originally Posted By: raidermark
Thank you all for the response. Yes the ticking is at warm up & seems to go away when warmed up. I will follow advice & not use any flush. I bought vehicle at 30K. I always used Mobil 1. I thought it was the best & still have confidence in it. I would be nervous about using a thicker oil as one advised if GM specifies to use 5/30. Wouldn't the tolerance's be to tight for a thicker oil? This Yukon is a 2007. Also the oil pressure gauge seems to be just below the 1/2 way point when warmed up at 1800 RPM.
No the clearances aren't to tight for thicker oil.
And if you've used M1 since 30000 miles I seriously doubt there is any need for any type of flush.
M1 is loud in some engines. It just is. Try a different brand. Or even a conventional. If you're running 5000 mile intervals anyways there's no gain using a synthetic anyways.
Conventional tend to be less noisy,I don't know why,and I guarantee you'd not be able to see nor would a lab find any wear differences between a syn and conventional at 5000 mile intervals.
Try Quaker state ultimate durability. At 10000 mile intervals.