SOHC.co.uk Forums > Anorak's Corner
Zinc content in oil
K2-K6:
https://en.m.wikipedia.org/wiki/Extreme_pressure_additive
There's a crossover into EP gear oils that touches / borders the discussion of inclusion of ZDDP in engine oils, not necessarily applicable to our engines but it shows a little more of the scope and interaction with some of the compounds used and helps to form a picture of what's going on.
totty:
I had mate who's brother was an oil blender, both were big fans of Molly. They talked me into ignoring the warnings and trying a Molly additive in an automatic gearbox and a couple of bikes with wet clutches. I really couldn't do their arguments for it justice, but I recall that it mostly related to how it bonded to materials (including that it wouldn't bond to itself unlike ptfe) and that it would help avoid getting to the extreme situations were zddp helps. Added over a few years every oil change it didn't cause any clutch slip.
K2-K6:
It seems to be very good at friction reduction but I've always kept away from use with wet clutches.
You don't have any contact with the original persuaders do you? that may add to our thread.
I've seen it put into manual car gearboxes and all but prevent the synchro rings working as it changed the friction they impart so much that it puts the gears at risk as the synchro function just didn't spin up the opposing gear sets to match their speed. It's probably these things that have formed my view as to how slippery it is.
I've read alot from this source https://bobistheoilguy.com/whats-in-your-motor-oil/ and there's is so much material out there relating to this stuff.
Another key that gets into all sort of ZDDP analysis is to search for it with "flat tappet cams" you'll be deluged with camshaft specific experiences surrounding it's use, effects and levels of desirable content.
totty:
No, sadly he died a few years ago, but he would have been all over this, he loved a good oil thread.
The tickover rose on one car when I added Molly, definitely slippery stuff.
Green1:
I wish I could understand what was going on my brain keeps turning to mush. :-[
The way I understand it ZDDP is a last resort in the oils defences so if its changed often enough it should never be needed.
I think the most important thing is to use the right grade and change often.
Feel free to correct me if I'm wrong it wouldn't be the first time.
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