Cool chart
@Burla. Where did you find that one?
Interesting observations -
Polyol Esters (Red Line, Jet Oils) have highest temperature application of any oils (except silicone, which isn't a very good lubricant so only used in wild applications such as blast furnace skip car charge ways), hence it's exclusive use in all jet engine bearings.
Polyol Esters are not the lowest temperature application of any oils - Polyalphaolefins (API Group IV "traditional" synthetic oil) are. This is because Polyol Esters have higher density than PAO, being formed by reacting an acid and an alcohol instead of lengthening a hydrocarbon ethylene chain molecule. Yet Polyol Esters are still significantly lower temperature application than conventional mineral oils.
Real world implications for us - Red Line is, without a doubt, the top engine oil for high temp and high load engine applications. Hence it's selection as a racing oil, for a premium price, because it is manufactured from two different chemical. There is no other base oil that performs better at high temp and load. For HEMI engines, it's super higher viscosity index with increasing temperature helps retain film thickness on the poorly-lubricated valve train. An additional benefit is the clinginess of polyol ester to metallic surfaces, helping to retain a lubricant film.
@Burla already discussed the dry film lubricant additive package so I won't belabor. PUP has a good package too, just not as much as Red Line. FCA knows their Gen III HEMI valvetrain is poorly-lubricated, hence their insistence on using PUP.
Because polyol esters are so dense and their flow rate is more affected at cold ambient startup than PAO's, we've recommended changing from Red Line 5W-30 to 0W-30 during winter, and using oversize synthetic oil filters to improve flow rate - but it's also important to use high efficiency oil filters because the valvetrain is sensitive to deposit plugging due to it's marginal design.
This all sounds esoteric and horrible until you get over the fact that these simple changes allow the HEMI to live a long life, whereas clunkers like Ford's "ecoboost" and GM's "AFI" all die premature deaths with nothing you can do about it.
