AMSOIL synthetic motor oils are completely different from what a lot of people are used
to. Most people are used to having to change their oil every 3,000 miles, and are used to all
of the varnish and sludge inside their engines. So, I often get asked "OK, I am confused, what
am I supposed to do?"
Well, there are several different routes you can take, depending on what kind of vehicle you have and on what you want to do.
Let's say you have a Brand New Vehicle:
If you have a brand new vehicle, I would recommend you leave the factory fill in for 500 miles for a gasoline engine, and for about 5,000 miles for a diesel. After this period, you can drain the oil, and put in the AMSOIL synthetic oil, and install an AMSOIL Super Duty oil filter. Then, in 6 months, or 12,500 miles(whichever comes first), replace the Super Duty filter, and top off the oil. At 1 year, or 25,000 miles(whichever comes first) change both the oil and the filter. That is all there is to it! If you decide to go with another brand of oil filter, you need to change the filter at the manufacture's recommended interval.
If you use oil analysis, also available through AMSOIL, you can get a better handle on what your oil change interval should be. I would recommend implementing a used oil analysis program, it will determine when you need to change the oil, and will also let you know if you have a problem before it becomes a major problem. If you install a by-pass filter and use oil analysis, it is quite possible that you may not need to change your oil again!
If you have a vehicle has over 30,000 miles on it:
If your vehicle has over 30,000 miles on it, I would recommend using AMSOIL engine flush before switching over to AMSOIL. This will remove any heavy deposits left in the engine from the petroleum oil.
To do this, I would recommend purchasing a cheap filter from the parts store, remove the old filter (do not drain the oil yet) and install the cheap filter. Now pour in the AMSOIL engine flush. Replacing the filter will lower the fluid level enough to allow for the engine flush, and will give your engine an "empty trash can" to catch the loosened deposits.
After your have ran the flush, as per the instructions on the bottle, you can drain the oil, and replace the filter with the AMSOIL SDF filter, and fill the crankcase with AMSOIL synthetic motor oil. You are now good till 12,500 miles or six months, whichever comes first, and then you replace the SDF filter, top off the oil. You should then be good for another 12,500 miles, or another six months, at which point you should change the oil and filter.
If you install the AMSOIL By-Pass filter system:
If you have an AMSOIL By-Pass filter system installed, you should change the full flow filter as mentioned above, and the by-pass filter should be changed every 25,000 miles or one year. You can tell if the by-pass filter is getting flow by putting your had on the filter canister after you have had the engine running (the filter should be warm). If the filter is not warm, it has reached its capacity and should be changed.
I would highly recommend using oil analysis, since the by-pass filter will keep the oil analytically clean, you may not ever have to change the oil again. You do need to sample the oil however to verify the condition of the oil to make certain that you do not have fuel dilution, water, or high wear particles.