Originally Posted By: Gary Allan
Any info-study is usually by a producer of the product. Not that it's invalid ..just not independent. All of your SAE papers have an en vogue agenda to them. If they didn't produce the results that they're reporting, they don't get published.
I have yet to see a failed SAE paper referenced (no, that's not all that serious a statement other than to make a point).
Do any of you think the study by GM fluid engineers ..that showed that OEM GM Dex VI was superior in performance to other multi-vehicle formulas had shown otherwise ..that you ever would have seen it hit the light of day? I hope you don't believe that.
So, we're left with figuring that any "proof" was more or less constructed to achieve that goal.
That being said, the only people that should have to worry are those who use over 220lbf max springs. That's about the common flat tappet cam'd engine's spring rating. If you've got 200lbf on the seats, I'd be dosing that oil with zddp.
You can't run a race car (as easy as it is to build one out of a catalog today) and expect OEM 150k mile + reliability.
When you say " If you've got 200lbf on the seats, I'd be dosing that oil with zddp." Do you mean installed height (in my case 1.700) or at fully open height of 1.200.
Well let's see. My valve springs are 110# at installed height of 1.700 and 290# at 1.200. So, is the 290# open pressure what you are refering to? The lifter is on the cam with open or closed valves, it is just how much pressure is being put on the cam by the compressed and then somewhat relaxed valve springs as the engine runs.
I have been asking numerous times, how much ZDDP should I be running? "Dosing" is not a number!
No one, so far except for a "mouse milk" seller, has given me a number. All I am asking for is factual information on how much ZDDP I should be running, PPM or %, to keep my engine healthy.
It also seems to me, that the seller or shill for the "mouse milk" has a financial stake in the results. That was why I asked for independent results.
Which SAE papers? I asked for proof from the API, different from the SAE, or a recognized university.