Why synthetic?

[Nitram_b4]

One thing I noticed, I rebuilt my top end about 4,000 miles ago, I ran Dino oil for the most part. There was discoloring and residue all over the inside of the rocker boxes (50,000 miles) I cleaned them up to a point. Since the break in I have been running Synth.
Last week I pulled it down to install ported heads. The rocker boxes were spotless, looked like new. I don't know if it means chit but take it for what it is worth

[denfire621]

This is not the first time I'd heard this (the engine looking amazingly clean with the use of synthetic oil). I like the idea of the motor being clean, but my real reason was listed on the front page. The synthetic oils were originally formulated to deal with the high temperature of aircraft engines, specifically jet engines. By nature our bikes, running with air-cooled engines, are going to run hotter than the average engine. That's where the difference lies. Virtually ANY oil out there, dino or otherwise, will do the jobe of lubricating our engines. The heat they generate dictates a synthetic oil as possibly the better choice. ESPECIALLY during a summer like the last one! From what I've read, the vast majority of us tend to baby our bikes when it comes to changing the oil. That said, we could probably use almost any oil out there--including dino oil. I read an article (where I read this article escapes me) that said the dino oil out there on the shelves today is FAR better than the dino oils from yesteryear, and could probably be run without a second thought. Still, going back to my original point, I breathe a bit easer putting a synthetic oil in my bike as it runs cooler. That's what works for me.

Den

[John Adams]

I did the 1000-mile service on my '13 FXDC today and used Mobil 1 in all three.... 20/50 V-Twin for the engine, 75/90 gear oil in the tranny and ATF in the primary. She loves it. I could hear her going "ahhhhh" as we took the first ride.

[georgedouglas]

Originally Posted by denfire621

This is not the first time I'd heard this (the engine looking amazingly clean with the use of synthetic oil). I like the idea of the motor being clean, but my real reason was listed on the front page. The synthetic oils were originally formulated to deal with the high temperature of aircraft engines, specifically jet engines. By nature our bikes, running with air-cooled engines, are going to run hotter than the average engine. That's where the difference lies. Virtually ANY oil out there, dino or otherwise, will do the jobe of lubricating our engines. The heat they generate dictates a synthetic oil as possibly the better choice. ESPECIALLY during a summer like the last one! From what I've read, the vast majority of us tend to baby our bikes when it comes to changing the oil. That said, we could probably use almost any oil out there--including dino oil. I read an article (where I read this article escapes me) that said the dino oil out there on the shelves today is FAR better than the dino oils from yesteryear, and could probably be run without a second thought. Still, going back to my original point, I breathe a bit easer putting a synthetic oil in my bike as it runs cooler. That's what works for me.

Den

I was a jet engine mechanic in the USAF back in the sixties and was servicing jet engines with synthetic and then the next 30 years with commercial jets. When I was introduced to AMSOIL in 1981 I jumped on it without reservation and haven't used a dino oil since.

It is common knowledge that dino oils have improved greatly over the last 30 years, but synthetics have also and their is some new base stocks on the horizon that will be even better. Engine manufactures are driving the oil companies to constantly improve their oils due to the design changes to get better fuel mileage.
george