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just open you mind old man and read,,,,,,, unless your that stuburn http://www.amsoil.com/storefront/atm.aspx



From Amsoil's main page:
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SERVICE LIFE
AMSOIL Synthetic 10W-30 Motor Oil is recommended for extended drain intervals in unmodified(1), mechanically sound(2) gasoline fueled vehicles as follows:

• Normal Service(3) – Up to 25,000 miles or one year, whichever comes first.

• Severe Service(4) – Up to 15,000 miles or one year, whichever comes first.

• Replace AMSOIL Ea full-flow oil filter at the time of oil change up to 25,000 miles or one year service life, whichever comes first (other brands at standard OEM* intervals).

• In all other applications, extend the oil change interval according to oil analysis or follow the OEM* drain interval.

*OEM – Original Equipment Manufacturer

(1) Engines operating under modified conditions are excluded from extended drain recommendations. Examples include the use of performance computer chips; non-OEM approved exhaust (headers?), fuel or air induction systems (intake, fuel pump, carb?); and the use of fuels other than those recommended for normal operation by the manufacturers.

(2) Engines are in good working condition and within the factory design settings(cam, pistons?). Mechanically sound engines, for example, do not leak oil or consume excessive amounts, are not worn out, do not overheat, do not have internal or external anti-freeze leaks and have properly working emission control systems. AMSOIL recommends repairing malfunctioning engines prior to the installation of AMSOIL synthetic oils.

(3) Personal transportation vehicles frequently traveling greater than 10 miles (16 km) at a time and not operating under severe service.

(4) Turbo/supercharged vehicles, commercial or fleet vehicles, excessive engine idling, use of AMSOIL engine oil in vehicles with over 100,000 miles without prior regular use of AMSOIL engine oil, daily short trip driving (less than 10 miles), frequent towing, plowing, hauling or dusty-condition driving.



Looks to me like virtually ALL of our cars, the hotrods in particular, only meet the "Severe Service" levels AT BEST. Probably don't meet their requirements at all, given the mods we've all done. Years ago, Consumer Reports found there was no benefit in running a synthetic over even a garden-variety dino oil. Now with the elimination of zinc, you may need to suppliment the oil for a flat tappet cam. In a modern injected engine, there's no reason dino oil can't go 5-7K miles if short trips are kept to a minimum. Lots of short trip driving - or a carbureted engine, and you should probably shorten up the change interval.

The Maintenance Minder in my Honda Fit indicated a 5600 mile change interval on the original fill oil. I ordered an oil analysis from Blackstone Labs, and I'll see how that result looks soon. I'm guessing I'll end up staying around 5K changes on that car. My Valiant doesn't see 5K miles a year, so I'll probably just stick with yearly changes on it. Now that I'm out of the turbo car business, I don't see myself using a synthetic any time soon.

Clair


Thanks Clair, Show that even Amsoil has a lot of exceptions to keep their tit out of the wringer including ideal driving conditions which are very few and far between for the common person.