Dave, you will need to replace the table in the tech section.  

If your research confirms that PPM numbers over 1400 are more and more counterproductive, then you should truncate the table as Boule's old 1800 PPM top end is a very old racing oil spec.  

I think Redline goes up that high in their tables, but they are dealing with drag racers and stuff like that.

Art:

The failure caused by low idle speed, and lack of ZDDP appear to cause 2 seperate modes of failure.

The low idle speed kills the cam bearings and doesn't seem to do much damage to the cam or rockers.  I guess the low speed doesn't overstress the cam lobes or rockers.

The lack of ZDDP doesn't do anything to the cam bearings and they stay smooth and shiny - but it causes the cam lobes and rocker to wear too fast.

If someone had a low idle speed and oil without enough ZDDP - I suppose they could damage the bearings and wear out the cam lobes and rocker simultaneously.

Art Webb wrote on 11/04/15 at 10:20:49:


I dunno....most folks formulate 20W-50 with high doses of ZDDP as it is not an oil approved or listed for use in modern fuel injected engines.....you won't ever see the "Energy Saving Star" on a bottle of 20W-50.  Most stuff that uses 20W-50 is vintage or race oriented.  Somebody needs to find out if the Castrol 20W-50 has friction modifiers and how much ZDDP is in it.

No? Kinda need to elaborate..

NO  Lucas.

Not approved for wet clutch use at all by the mgf.    Contains TONS of friction modifiers and the Lucas base oil contains bad polymers as well.

We've checked Lucas before and found only bad news, and we have also had newbies come on board after using the stuff and contaminating their clutches VERY BADLY.

If someone want to say Castrol oil is good stuff, please refine your statement down to WHICH CASTROL product you are talking about.

Castrol is like Kendal now-a-days, just a brand name that is currently owned by British Petroleum (BP) who trots it out occasionally to try to sell something to the American big engine muscle car owners.

Castrol oil built by Castrol Inc. back in the day was a high ZDDP oil, like many others of the era.    It was refined from Pennsylvanian crude and it was a good oil back then.  

This is NOT what  you are getting today -- it is a BP standard formulated oil in a Castrol jug.

Castrol Edge seems to have somewhat better specs that most of the Castrols lately, but it isn't consistent year to year and it gets weaker every time the general car specs change.

Pick which one you want to contest, and let's be about it -- been a year at least since we did a Castrol lookie-see.

Gus wrote on 11/04/15 at 13:14:24:



NO, what? You use 20-50?