While I appreciate feedback on the original topic, I do not want my thread to turn into anything other than a focus on the topic listed. Vendor involvement in scientific or engineering based research is another topic for another thread. Please keep this thread on topic. Thank you for reading it if you did...and thank you for considering my stance.

this is one of those moments when I just want to be kind. You need to read the wiki, I won't even mention basic chemistry.
http://en.wikipedia.org/wiki/Temperature_dependence_of_liquid_viscosity

:iagree: :beatdeadhorse:

Read all of the posted info in the Motor Oil university. I promise you, the answer is in there.

So you quote my second reply instead of addressing my first, in an effort to try and stop the inevitable, but by doing so, help create the same thing you are trying to avoid? Did I just confuse myself there? Anyways, why not just ignore the comment and address my first posting? I believe I asked you a question in there somewhere...

Yep found it:

OP, good post and thanks for sharing this information and your opinions.

ALL!!!

My apologies for the listed oil weight! Total typo...I meant to recommend a 0W-30 NOT 0W-20! Guess with all that typing, I overlooked that detail...sorry.

My apologies for quoting your 2nd post instead of this one.

I did not measure the "tip-weight" of the YT's. This really is irrelevant to valve train function in the operating conditions we deal with. It has the equivalent affect as say...a mouse fart in a tornado.

oil temps on the oem Z06 with the air oil cooler IS something that needs improving. I have my cooler covered and the dry sump tank. I drive 12 miles to work. Oil temps with a 5w/30 pennzoil ultra oil never gets close to 200F. This is in 50-60 F weather. It may see for a few minutes only....170F.
Remember also this is NOT the temp of the oil going into the engine. That oil is about 20-25F COOLer than the oem sensor shows. You think you have 200F---nope--you have 175F. You think you have 125F--nope to have 100 and so forth.
I would love to see the temps in the pan.
I have been curious as to why uoa are not showing wear when people's valve guides are obviously getting worn?
I do like the fix for the side loading--regardless.

uoa???

I am not understanding what it is you're measuring here. Could you please explain in a bit more detail.
Thanks, Ernie

Another reason to get the ZR1 style oil cooler. Just did a 25 min drive at 60mph w/ZR1 style cooler, oil temps were 167 at 12 miles and 179 when I parked in the garage. And BTW the OAT was 34F (low humidity).

:withstupid: (just sayin I don't understand either.)

Man, I wish I took pictures. Basically, a rocker arm is a pivot that needs to open and close the valve. True perpendicular motion is ideal. The way the factory has it, the motion of this pivoting action is not a true open and close. There is a measured amount of "side-load" that creates another range of motion that makes the valve not open in just an open and shut manner. It opens, but it has a force pushing on it sideways (due to the improper geometry) that forces it to exert additional force into the wall of the valve guide which causes excessive wear when coupled with the other issues mentioned. Does that make sense?

Interesting thoughts, OP.

Then that would be just about never for me. It takes a real hot day coupled with stop and go driving to get there. I am however planning to go the Dewitt's route with intergrated oil/water cooler once my GMPP is up in 2016.

Gee, what a nice guy. I won't mention that I worked in a chemistry field and am familiar with viscosity. All that withstanding, I will try and restate my question differently.

The way I read all this information, the viscosity of a 0W-30 oil at 75°F will be, lets say 40 for the sake of argument. A 0W-40 oil will ALSO have a viscosity of 40 at 75°F. True?

If this is true, then why would one prefer a 0W-30 weight oil over a 0W-40 weight oil since at operating temps of 200°F the viscosity of a 40 weight oil will be higher than a 30 weight oil?

Quick, (wasn't sure if you're okay with me mentioning your name)

I kind of put forgotmypen on blast earlier...it wouldn't be fair if I didn't request the same of you. I'm asking to keep the thread on topic. I know you weren't specifying anything to the contrary other than a response...but I would like this thread to be based purely my inputs without influencing other previous vendor tests. I completely agree that it would be awesome for someone to test my theory that was neutral...but, can we please save that for another thread.

Thanks man. FWIW, your compilation of data inspired me to really look into potential causes of our issues. And I appreciate your efforts on this board...please continue on compiling your information.

Perfect sense, but how do you measure it?

To all of your points, concerns and requests above...Absolutely my friend. :thumbs::cheers: Absolutely.

I look forward to you carrying on in your efforts, and will do all that I can to help and encourage you in that endeavor. :thumbs::cheers: