Quote:
Originally Posted by p76rangie
Yes and no. If you live in a very cold climate (below 0C) if the oil doesn't circulate quick enough on start up, you are going to cause wear. So like anything, it is a compromise and you will need a lower xW rating for cold climates, but you should try and maximise the hot viscosity.
|
You can play with it or explain it away for odd cases all you want. I repeat, the simple fact is the lifters are made for 20W50. If someone in -30C temperatures feels like moving to 10W40 I see no harm in that. In any event, it is those who jump into a cold vehicle, start it up and dash off without allowing the oil to warm who have the greatest wear. That practice causes far more wear than you are suggesting from a mildly thicker viscosity in cold weather.
Quote:
Originally Posted by p76rangie
Again not strictly correct. All oils still have it, around 1200ppm.
|
Where HAVE you been?!!!
Why don't you try something. Try to get a mainsteam oil company in the US to give you their oils' constituents. In the UK (which Australia follows) the news is less grim, some of their stock oils still have as high as 1000ppm (the legal limit)..but that will be brought down as well over the next 18 months
Quote:
Originally Posted by p76rangie
It was never designed to protect surfaces for 2500 to 3000 miles.
|
Son, whatever quantity you put in, it will have little or no beneficial effect after 2500-3500 miles and our own analysis indicates you would be safer relying on the lower range.
Quote:
Originally Posted by p76rangie
What it was designed to do was to protect it if for some reason there is no oil on the contact surfaces. The amount of zinc only determines how long it will protect without oil, not the level of protection it gives.
|
That is more than a little contrived. What you suggest is that zddp has its happiest effect on cams and lifters and every other metal to metal contact when the oil has drains off after the oil pumps is off. OK! (smile) Let's go for that. Then why would you want to do without it?
Quote:
Originally Posted by p76rangie
The claims that the reduced levels have caused cam failures has not been scientifically proven and is mainly emotional statements from people who do not like change.
|
I agree that the some statements at the outset were silly exaggerations and we took them that way. However, in our case, we did extensive research to be sure. Crane, a frequent supplier and a noted cam maker under many names, did extensive tests with and without the additive. In a nutshell, flat tappet engines need it. If you still have your head in the sand, you will learn your lesson the next time you do a cam/lifter change and then quickly become a convert to the new world.
You see, if one follows my advice and believes the tests and I turn out wrong, there is no harm done beyond a 2-3 dollars an oil change or $12 of special cam lube at a cam switch. If they follow your advice and ignore all and you are wrong, they will watch their care become very sad and have to replace their cam and lifters. Not much a deep decision to make there mate! You lose.
Quote:
Originally Posted by p76rangie
Incorrect again. Since January 2007, diesel oils have also had to comply with reduced zinc levels in the USA.
|
Fine give me the web addresses of 2-3 US motor diesel oils showing their constituents.
Quote:
Originally Posted by p76rangie
I am not sure why the same old points keep on getting raised.
|
Partly because you are not right and it is key that correct information is offered in public forums as much as is possible. The other reason is because you are gratuitously rude to everyone. (Curious about that, is it a manliness thing?) Discussion group bloom if discussion is encouraged rather than ridiculed (especially inaccurately.) lt is never too late to correct a mistake.
In any event, I am a P76 fan, though we have moved far past that. What do you think of the new Coscast LR blocks? Absolutely amazing
James
