QUOTE(Optiplex330 @ Jun 11 2012, 11:39 AM)
I just did and this sentence is saying, if 10w30 can be used, 05W30 can also. But this is not what Proton and some turbo diesel manufacturer are saying. Hence my confusion.
"Once an engine has reached its working temperature (if over 70°C) the SAE "W" rating has no effect on the engine."
i tend to more 'better wear protection' word on why they come out with 10w...
i got this from agpturbo site;
"If you have a standard bearing turbocharger: The loads produced on your standard bearing turbocharger’s rotating assembly require oils with high levels of ZDDP to adequately create a film between like metals. Standard bearing turbine shafts spin between bushings (bearings) and must have a constant film of oil in order for the components to survive. This is where choosing the right oil can make the difference. We have found that Brad Penn Grade 1 is one of the best and most cost effective oil out there. Other oils that we’ve found that contain the proper levels of ZDDP are Valvoline VR1 and VR1 Synthetic NSL, and Amsoil SAE Synthetic Premium Protection. We have also used Rotellla T6 synthetic oil with much success over the years.
Additionally, we advise using
thicker viscosity in these brands of oil as the heat generated by high shaft speeds will break down thin 0W, 5W, and 10W oils and cause the oil to coke inside the turbo where oil temperatures can exceed 200 degrees F. Your standard bearing turbo will enjoy that you make the right choice. These are merely suggestions by us, because we have seen failures due to improper oil over the years. These types of oils may not contain the many of the detergents that most off the shelf oils have, thus you will need to change your oil more regularly than you’re used to. If you feel that the oils you run are sufficient, we would recommend having an oil analysis completed by Blackstone Labs."
This post has been edited by wezeer: Jun 11 2012, 11:49 AM