Piston slap change with oil?

[danb303]

I was wondering if some oils helped with the piston slap? I have heard that it does. If so which ones are better.
What about oil additives, do they help?

thanks

[danb303]

it is actually time for an oil change and I am thinking about going synthetic. Any thoughts? Is it worth doubling the cost?
Does the synthetic help with the piston slap?

[saratoga]

My 01 6.0 had the tick tick tick tick tick on cold start no matter what oil I used. I preferred M-1 5W30.

[FastDonzi]

I read a test where they put mobile 1, Valvoline DuraBlend, and some others up against Royal Purple and amsoil. for the cheaper synthetics The durablend was the best. I swithced from Mobil 1 after seeing the results. Even in my lawn Mower, I certainly could tell a difference in sound (smoother) after switching the mower from Mobil 1,to DuraBlend. I'm a believer.....So now the truck, tractor, boat and all are on the VDB diet.

[jpringle3]

If it is piston slap there is only one cure, and that's a new piston. Before you condemn the engine and spend a lot of money remove all the belts and make sure it isn't a water pump, many people have been fooled on that one, even if you pull the plug wire on one cylinder and it goes away, and the noise seems to come from a specific cylinder, usually #3 or#5 it can be the water pump. If you are positive it's the piston cut the belts off as you will replace them anyway and try it then. Better to try this first than take it apart and find the pistons all OK. If you want to try an additive 15/40 is the best to clean it out and mask it if you want to flog it to someone else or before you change the oil add an extra quart of ATF over full, drive it gently for about 20 miles that should clean it out and if it does have to come apart it is a lot better to work with. PLAY SAFE!

[max1]

I had an 01 6.0 and it rattled pretty bad at start ups, even with syn..oil

[danb303]

That is what I figured.

Anyone see any benefits with the syn?

[John DiMartino]

Originally Posted by danb303

That is what I figured.

Anyone see any benefits with the syn?

Synthetics flow better at very cold temps,and are more stable at high temps.If your truck will be subject to temps below 10degrees F,in the winter,synthetic oil will help tremdously on the cold starts.

[Heath]

There are many advantages to syns. Just a matter of whether they are worth it to you to change or not. Better hear transfer, more resistance to oxidative and thermal breakdown, cold flow properties, less volatility, lower coefficent of friction(less wear),among others. Although sutle differences, they can make a difference over time.
They cost more up front, but if you are looking for longevity and longer drain intervals, cost can be a wash or even a savings.
Heath

[LeadfootDuramax]

My wife's camaro Z28 has piston slap bad and has since new. I tried the German Castrol 0w40 because there has been much research showing it is the best for the motor. That didn't really change it any. I have now tried Royal Purple 10w30 with no change again. I think I am going back to a good (poss synthetic) 5w30 oil as the manual calls for and live with it. I feel that as long as it is protected with good oil that is the proper weight, there is nothing else I can do.