| lube ability under oil pressure and flow in identical bearings because each is relatively non compressible they do the same job preventing metal contact at the 1st level of protection ( there are several levels of protection). Thus if each is rated xxW-30 both have darn near the same viscosity at design temp of 100C (212F) around 10 to 11 +/- Cst. Dino oil starts with a certain base oil viscosity like 10W-30 starts with a 10W viscosity oil at 40C and viscosity improvers (VI) are added to develop the viscosity at design temp 100C. Syn 10w 30 oil starts starts with a 30 grade base viscosity and additives put in to obtain design viscosity behavior at 100C. The difference is that the dino base oil has a non uniform natural set of molecules from impurity removing vs syn oil that has designer molecules of relatively the same geometry made in the lab. Dino oils require VI to reach the desired viscosity at design temp compared to syn oil which doesn't use VI but other additives to get to the design viscosity at 100C. Note that with a 10W-30 vs a 5W-30 dino there is more VI in the 5W can (and lass base oil) to achieve the desired viscosity at design temp of 100C (212F). So if using dino try to stay away from those oils with a greater spread in the vis. Or use syn oil for the greater spread in API numbers. That is where syn oil has a benefit because it can achieve a wider spread in base syn oil and use less additives to achieve the desired viscosity at 100C and be thinner at start up where a lot of wear takes place till up to operating temp. The Group 4 PAO and group 5 Ester base oils used in synthetics are definitely better compared to dino Group 3 but as described in the video it depends on the use of the oil as to what to use. Syns handle heat better than dino oil because they are more stable and resist molecular changes and are thinner when cold compared to dino oils of the same API grade. Dino oil will degrade its molecular structure quicker than a syn oil thus can not be used for extended oil changes compared to some syn oils. But dino and syn oils wear out their additive package and that needs to be replenished with oil changes. Here is Valvoline oil details (no promo here just a company that had easy to find details available). I do not know if their full syn oil is Group 4 or Group 5. Note in the specs at 100C the viscosity is essentially the same for the same final weight oil (i.e. compare vis for all xxW-30 and see the 10 to 11 Cst range for the 30 weight at 100C). Thus syns and dino are not different in their ability to provide bearing support under oil pressure. [ [ http://www.valvoline.com/our-products/compare-motor-oil ]] Just left click on the bottle and then look for the PI Sheet and left click for specs. Hear is more detail on oils: [ [ http://passenger.lubrizoladditives360.com/vm-series-part-1-understanding-the-fundamentals-of-viscosity-modifiers-for-engine-oils/ ] ] More chat on oils (long but informative) [ [ http://www.ferrarichat.com/forum/faq.php?faq=haas_articles ] ] edited from earlier original post this day (12/2)
ZUL8TR in Orlando,FL |
