Been testing - LS1 Performance Information read this thread. i've been using this in a tbi350,3.8 v6, and amc360 for about a year. all of them run smoother, get better milage, and the valve covers and plugs in the 350 look like new. good luck
I know a few people who have tryed this, it really works, and it's cheap.
83 CJ7, 350 TBI, TH350, Dana 300 twin stick, Dana 44 E-locker, Ford 8.8, Detroit, 4:10 gears, 35x13.5x15s
"Just Exchange Every Part"
I tried Z-Maxx in mine, and there does seem to be a little more engine response. But on another note, I rubbed down the top of my welding table with it after heating it up real good with a space heater and there hasn't been a lick of rust on it for three years!
Beer is the answer - it doesn't matter what the question is!
I see a bunch of 'Hub Bub' made about the zinc levels in oil...
Nothing to it I can see.
No failures breaking in new cams, no cold start wear beyond what you normally see.
Just a marketing ploy by the guys still pumping zinc in their oils.
I can't verify that there are significant issues with the lack of ZDDP...but, can say that when I emailed the major oil manufacturers, they all indicated that they have recently (in the last couple years) have significantly reduced the amount...but "it should still be safe for flat tappet engines". Personally, it is worth an extra $2 an oil change to add a little cushion...
I've been using Marvel Mystery Oil for years in all my vehicles, in the gas and every 3rd or 4th oil chg. I add some in place of a little oil.
I've got about 120,00 miles on one of the engines with this routine just pull the oil cap an look inside you won't believe the difference from another engine without having used it, no accumulation of sludge to be seen.
I was one of the many people who developed a lifter tick after an oil change. I just delt with it for a month or two hoping it would go away. Then after reading about people using Marvel I gave it a shot. What a difference! Ticking went away and all is good! I realize most of the "Mechanic in a bottle" stuff is just a short term fix though.
I use Rotella T oil in all my vehicles (dirt bikes too). I have noticed Rotella really cleans out the motor. Especially on a neglected motor like my 27 year old 258.
I recently decided to try the high mileage oil in my wife's 120k mile truck. I don't see any difference but supposedly it helps with old seals so I figure what the heck.