Originally Posted By: threeputtpar
Originally Posted By: KCJeep
Since my original post I've noticed that oils high in boron tend to run even quieter than moly loaded oils.
For your next fill you could try Motorcraft, Peak, Quaker State Green bottle or Trop Artic, you may get some improvement from those boron loaded offerings. I'd try the 5w30 variety if you try one.
This kind of sums up what I've learned here on BITOG. Moly (a friction modifier)is good for fuel efficiency and Boron (and anti-wear additive) seems to be the magic bullet for internal engine noise (valvetrain).
With your Duratech, they are well known to have noisy injectors and the one in my SIL's 06 Escape sounds like a typewriter from 100 feet. I've tried many different oils to help (although she can't hear anything!) and Motorcraft 5W30 semi-syn made the most difference. Problem is that WalMart doesn't carry the 5 quart jug, so it can be as expensive as going with a Full Synthetic in the big jug.
If a high Boron oil doesn't solve the noise, then it's not internal engine parts it's something external.
Typewriter would be a fair statement for someone that "pecks" the keys lol. So Boron is an antiwear that will make an engine quite? Everyone say Pennzoil conventional does, but it isn't that high in Boron. Quaker State Conventional has much more. I don't think that will do the trick. I have tried Shell Formula 5w30 Full Synthetic. It has 245ppm of boron. That is more than Quaker State Conventional and the Shell Syn. is louder than Pennzoil conventional. So maybe boron isn't the key. Moly has done best so far. I haven't tried a thicker vis than a 5w30 (the engine calls for a 5w20)I've been tempted to try thicker and high zinc like Quaker State 5w30 HM Defy. Either that or go all out to a 5w40/0W40 syn. But they cost much more....funny that this "knock rocket" uses zero oil on a 6k oil change. But I have a Chrysler 4.0 v-6 van that is very quite but uses 1/2 qt. at 3500 miles....go figure.