IMO Valvoline and Amsoil makes the best synthetics. Id never use any pennzoil product.
IMO Valvoline and Amsoil makes the best synthetics. Id never use any pennzoil product.
I would have to read some outside testing results. Pennzoil has been known to construe the facts about their products.
Use what the builder suggests.
Also - search the site for break in procedure and you will find a ton of info.
It isn't a question about oil, it's a question about a noise in the valvetrain that is happening after switching to 5w20 and won't go away now.
Anyone have any comments on this??? My post was moved too... sigh
Dre alot of us run 5w30 or 10w30. I have run 10w30 for the last 20k miles.
This subject has been beaten to death over and over.Am quite confused, in the coyote 5.0, alot of people say run what factory says 5w 20. But some say its too thin and run 5w 50 like in the track packs. So best to run 5w 20 or 5w 50?
Nothing definite. I had the beehive springs on it so I don't think the valves were floating. It was suggested that the guy who did the head porting may have sunk the seats to low?? There was no indication that the valves ever hit the head. Maybe I just had some bad valves or weak valve keepers. I don't know. Kind of frustrating not knowing for sure why something broke.
Thanks for the advice and sorry about where I posted
Thanks for the advice
People in Washington State and Montana use 5w-20 and it's perfect for them. People in Florida and Texas should probably use 5w-30 or even 5w-50 if they run their car hard in the heat.
First number is cold viscosity, second number is hot viscosity. Explained dozens of times in this thread in more detail. A high first number can hurt your motor on cold startups. A low second number can hurt your motor in extended high temp operation.
Dre alot of us run 5w30 or 10w30. I have run 10w30 for the last 20k miles.
This subject has been beaten to death over and over.
The coyote will tolerate a wide range of viscosity. I use 5w20 all year round. So do a lot of other people including those who track their cars.
Use whatever lets you sleep at night.
Here is something to add to your confusion...
From a reputable GM source:
The Synthetic Oil Myth -- Then there is the myth that new engine break-in will not occur with synthetic oils. This one was apparently started by an aircraft engine manufacturer who put out a bulletin that said so. The fact is that Mobil 1 synthetic oil has been the factory-fill for many thousands of engines. Clearly, they have broken in quite well, and that should put this one to rest.
Here is something to add to your confusion...
From a reputable GM source:
The Synthetic Oil Myth -- Then there is the myth that new engine break-in will not occur with synthetic oils. This one was apparently started by an aircraft engine manufacturer who put out a bulletin that said so. The fact is that Mobil 1 synthetic oil has been the factory-fill for many thousands of engines. Clearly, they have broken in quite well, and that should put this one to rest.