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[LarryB]

It's not that it will run cooler as much as the high temps do not destroy the viscosity of the synthetic as they do with Dino oil

[Rsantucc]

It's not that it will run cooler as much as the high temps do not destroy the viscosity of the synthetic as they do with Dino oil

I have a 2005 Cherry FLHTCSE2 and have used Amsoil full Synthetic Oil since pick up in the engine and have had the oil get to 260 degrees in Sturgis traffic. I was scared but when I returned home and chnaged the oil the oil was as clear as it was when I changed it. I also have a Barnett Scorpion clutch and run ATF Type F Tranny fluid and Amsoil gear oil in the tranny. Buike runs like a charm and will never chnage the oils I use.

[spydglide]

It is truly amazing how everyone says the HD Syn3 oil is crap, yet, it seems to perform just fine for those of us that continue to run it.  If you take the time to really research the way the synthetic oils are produced you'll be surprised at how many 'myths' are running around out there as to what's what in the oils and how similar they all really are......just my .02.  Now, if you really want to compare products, let's discuss polishes/waxes.  har!  spyder

[Smuuth]

Whether you run Syn3 or some other synthetic is your choice.  The important thing is to NOT use conventional petroleum oil.  Conventional oil begins to break down at 240°F, a temperature your oil will easily reach in stop and go traffic.  Conventional oil temperature in excess of 240°F will break down petroleum oils and cause oxidation, which in turn forms deposits, varnish, and increases wear.  The only disadvantage of synthetic oil is the cost, but if you weigh that against the cost of a new engine, it puts it in perspective.

[miker]

I could bore the chit out of yas with coefficients of friction and other blah de blah..Another example are the 5 1800 hp rich burn diesels I am responsible for at work..When I switched them to a synthetic blend, output went up and consumption went down..Todays tolerances do need the shear strength offered by syn. But to each his own with these old fashioned Siamese crank, pushrod motors.

Synthetic oils, pioneered in the '70s by Mobil and now available from most major oil companies, take the all-season, multiviscosity approach to the outer limits. Unlike traditional mineral oils that are produced by distillation and further refining of existing crude oil stock, synthetic lubricants are made through chemical reactions. These new oils aren't synthetic or artificial in the sense that they're manufactured out of whole cloth--they still have the same natural ingredients found in "real" oil. But in a synthetic lubricant, these ingredients are recombined like a Lego set to yield synthesized-hydrocarbon molecular chains with desirable characteristics and uniformity not found in even the highest-quality traditional motor oils. Typically, the best synthetic oils use a combination of up to three different synthetic base fluids--polyalphaolefin (PAO), synthetic esters, and alkylated aromatics.

Because a synthetic oil's molecules are much more consistent in size and shape, they are better able to withstand extreme engine temperatures. By contrast, the unstable molecules in conventional oil can easily vaporize or oxidize in extreme heat. Mobil 1 synthetic is said to be capable of protecting engines "at well over 400 degrees F"; in the real world, most racers have no problem running synthetics up to 290 degrees F under prolonged use, but they get really jumpy when a conventional exceeds 270 degrees F.