Bought a bottle of Redline ZDDP a couple of years ago to add to my Rotella. Picked it off the shelf this week and there is a mass of pink sludge on the bottom of the bottle. Mixed it up and it doesn't look good. Probably not a good idea to use it ? (1 oz per gal.)
cheers!  

I’ll have to go look at mine , I would guess it the heavier elements settling. I find it odd people only complaint about in cold weather , you would think that heavier elements would settle faster when it’s warm. Maybe it’s not a heavier element , I’ve  seen similar sludge in lubricants that have Teflon. I’ll mess with mine chill it warm it  and see what happen. Better guess it’s just been sitting on the shelf for hella long time and spring is near and some are doing their every other year oil change , huh , admit it !

Mine is dark red , cap is tight , on a shelf not on floor . Just the slightest pinkish haze only on the very bottom. Coldest here is maybe 30ish but it does get hot enough to fry eggs. Everything gets a spoonful , just a bit.