Piston slap and brand of oil: relationship?
 

I noticed someone posted on here about a month ago that he noticed piston slap after changing to Mobil 1 oil.
I have a 2000 F150 5.4L that I just bought in December. Even though it was real cold for the first month or so, I didn't notice anything like piston slap. After my first 3,000 miles I did my first oil change and used Mobil 1 full synthetic 5w-30. I'm not 100% sure this isn't a coincidence, but since then I have noticed what seems to be piston slap.
Could piston slap and oil be related?
On the same subject, has anyone noticed any sort of noises whatsoever relating to a specific brand or grade of oil? And if any of this has any merit, is there a brand or grade of oil that lessens any of these noises?

I'm coming up on my 2nd oil change in a couple hundred miles and although I am a fan of Mobil 1, I'm thinking of trying something new to see if it makes a difference. Any suggestions? I'm thinking about maybe staying with Mobil 1 but also adding Lucas.

I have noticed that some oils do seem to allow more noise (on cool mornings)than others on my 02. I have also noticed that most oils are ok if the temp stays above roughly 65 degrees.

With that said, here are the oils that seem noisy ON MY TRUCK:
Royal purple (5w-30),
Valvoline (5w-30),
penzoil (5w-30),
castrol (5w-30 syn and blend).

The oils that I have found that allow seemingly less noise are:
Mobile1 (syn and blend),
Motorcraft (5w-20),
Havoline (5w-30)

Today, I am running a motorcraft 5w-20 and I am surprised at how well it seems to be performing. I am using a 3k oil change interval.

These observations are MY experiences over the nearly 90k miles that i have on my truck. I currently average 16 mpg.

There has been talk about some oil filters letting the oil drain back thru the pump and back into the pan over night. Then in the morning you get a dry start and lifter clatter. Fram was mentioned as bad for it. I've been using Mobile1 15W50 and Motorcraft filters for 3 years now. No piston slap or valve clatter but I am starting to get timing chain rattle cause that freaking plastic chain tensioner is going again. :mad:

I have been using mobil 1 5w30 for 45K miles with little or no piston slap. And I have 115K miles on the truck (4.6L)

Any type of Oil, Dyno or Syn, will not cause or cure piston slap. You may notice more or less ticking noises with difference weights but that is about it.