HoosierTrooper
Well-Known Member
Because the API has limits on phosphorus and ZDDP ( zinc dialkyldithiophosphate) because levels that are too high have been shown to damage catalytic converters. Redlines HP has levels well above the API limits on both so they cannot get the API certification. The Professional series has much lower levels so they have passed the API tests. More is not always better, moly is a good example because there are a few different types available. Infineum is an additive company that is co-owned by Mobil and Shell and they use a tri-nuclear type of moly in their ad packs and have found that concentrations of 70-100 ppm are all that is necessary for adequate protection. ZDDP and phosporous are the primary anti wear agents in oil, the other additives like moly, boron and titanium are added as supplements to work with them.Why would redline HP not meet API & other requirements if it does indeed have more and better additives.. wouldnt that make sense?
Redline doesn't use "better" additives just higher levels. Whoever they buy the ad pack from, Infineum, Lubrizol, Chevron or one of the few others sell the same additives to the blenders at whatever level they request.
If you have trouble sleeping here's API 1509 which covers everything. I've read every word...