Does synthetic oil have enough zinc to run with out a additive or would i be better off buying the oil that has the higher amounts already in it.Right now i am using rotella t with stp additive.
Posted By: dOoC
Re: synthetic oil - 04/26/10 11:31 PM
From what I know ....most ALL oil now has very little zinc in it. I just heard today that the sticky-visc-improver STP (red can?) has a bunch of zinc in it.
Syn oil is way more cost than dino ...so I am just going to use that STP with some 10-30 or there-abouts.
Posted By: fury4speed
Re: synthetic oil - 04/26/10 11:46 PM
Oil has been discused a lot lately , here is a recent discussion about Oil ,I use BradPenn Oil , good stuff , no syn Oil on older Cars especially at break-in.
Oil Discussion for Old Muscle Cars Quick link
Posted By: Pacnorthcuda
Re: synthetic oil - 04/26/10 11:55 PM
"specialty" synthetic brands like Amsoil and Redline have good Zinc/Ph levels. Mobil 1 probably is Ok although I haven't seen a recent lab report.
More 'generic' labels like Pennzoil or Quaker state I don't know.
STP red was tested and came up with 4000 ppm. ZDDPlus has 57,000ppm. Do the math for your crankcase capacity and see if STP makes you comfortable. It raises it some but not a lot. (I think the red bottle is 15 ounces)
Chevron Delo and Rotella diesel oils are so far testing OK (about 1200-1300ppm) be they could be reformulated downward at any time with no notice.
Posted By: Locomotion
Re: synthetic oil - 04/26/10 11:55 PM
Amsoil has a variety of high zinc oils and synthetics have other benefits over conventional oils also. One obvious example was when I switched form conventional Rotella 15w-40 to Amsoil synthetic diesel 15w-40. There was an obvious temperature drop and a slight increase in fuel mileage. I travel the same routes often so the comparison was easy. My race car engine, trans and differential people have all had positive comments on what they have seen in my stuff.
Not all synthetics are created equal either. But find out what you can and make your own educated decision. Most oils have gone down in zinc content over the years, even diesel oils. So one has to find
recent info.
Amsoil synthetic high zinc oils Amsoil source & additional info.
Posted By: Dakota542
Re: synthetic oil - 04/27/10 12:00 AM
Personally I use synthetic oil in most everything, and never had a problem. Mixed it with convertional, different oil filters, different companies, roller cam, flat tappet, OHC, whatever. The only problem I ever had was on an old 2.8L Chevy, changed back to conventional for one oil change and spun a bearing after about 600 miles. Coincidence? They say not to use synthetic on new engines, until they are broke-in properly.
Posted By: Neil
Re: synthetic oil - 04/27/10 12:29 AM
My truck engine was broken in on standard Valvoline and a full bottle of GM EOS. I am just sticking with the same oil and adding a little EOS in just in case. The cam in my truck is a smaller Lunati Voodoo and doesn't have a ton of spring pressure. On a more built-up engine I would not trust any of the conventional oils anymore.
Posted By: DennisH
Re: synthetic oil - 04/27/10 12:17 PM
Royal Purple or Amsoil in everything. 10-40 Amsoil in the 440.