What About Switching A High Mileage Engine to AMSOIL?
As long as it is a sound engine, in good mechanical condition, it should be no problem. Just make sure you use AMSOIL Engine Flush in the change-over and follow the oil filter change recommendations to make sure you remove the accumulated dirt from the system.
If your engine has over 30,000 miles, change the oil filter out with an inexpensive oil filter without draining the oil in the oil pan. This leaves room in the oil pan for the 16-oz. can of engine flush without overfilling the system. Start the vehicle and allow to run for 20 to 30 minutes at idle. Shut down the engine, drain the oil, change out the filter with a good AMSOIL Super Duty Oil Filter, and fill the crankcase with AMSOIL.
Although it is a bit of an involved ritual, here is what I recommend for any car over 60,000 miles. Purchase two inexpensive oil filters at the local discount store and replaced the filter on the vehicle with one, without draining the oil pan. Also take a clean container and drained a cup of oil into it and then catch in mid-stream oil in an Oil Analyzers sample bottle to send off for oil analysis. Put the oil in the cup back in the engine. Prepare to send the oil sample to Oil Analyzers, Inc. This sets a baseline for the condition of the engine and determines that the engine is in good shape. Although the AMSOIL warranty is better than the average warranty out there (when was the last time you read the warranty for Pennzoil or Valvoline?), it does provide that the warranty covers engines in good mechanical condition. Twenty thousand miles from now, you want some idea what condition the engine was in back then. It also is just a good idea to test the oil periodically, even if you don’t use AMSOIL or any synthetic, just to know what is going on inside your engine.
I next added a can of AMSOIL's Engine Flush. Had I left the old filter in place, the dirt the engine flush cleaned off the surfaces in the engine would just go around and around and not provide any further cleaning. The changing out to the new filter reduced the oil level by a quart, leaving room for the flush and would catch the dirt as it circulated. You don't want to over-fill the crankcase so it works well to replace the filter, then replace the lost oil with the engine flush. Also, you don't want to drive the car during this engine-cleaning phase. Adding the flush thins the oil quite a bit. Let the vehicle idle for 30 minutes and then drained the oil and remove the first inexpensive filter while hot. Needless to say, the oil will likely be really dirty.
If possible, let the drain plug off over-night. Every drip of oil brings out more dirt. Next fill the engine with the AMSOIL oil of choice and installed.
Now install the second inexpensive oil filter. The oil will continue to clean the engine and I planned on leaving this second inexpensive filter on for a short time. If the engine has 60,000 miles on it, use this filter for 1,000 to 1,500 miles. If it has over 100,000 miles on it, use it for only 500 to 700 miles. The reason for this step is that the AMSOIL Synthetic Motor Oil is a high detergent oil with a very intense additive package. It will continue to clean the inside of the engine and deposit the dirt and accumulated varnish into this filter. Because of the volume of dirt being circulated, this filter will likely reach capacity quickly.
If you have ever heard of someone complain that they changed their oil and then started using oil after just 1,500 miles or so, what probably happened is they changed oil brands. When you change oil brands, the new oil has a unique and different chemical makeup and will often go about doing its job cleaning the engine and depositing the dirt into the filter. The filter becomes clogged and the by-pass valve in the filter opens and the dirty oil circulates getting dirtier and dirtier. The dirt accumulates behind the rings and the engine looses compression seal, increasing blow-by the oil consumption. Often the oil and filter is changed and the problem goes away because now the oil is clean and the filter is functioning properly, but the oil that was in there is wrongly blamed for not performing adequately, when it was really just doing its job of cleaning the engine.
After the second inexpensive filter has run for the appropriate period, change it out and install the appropriate AMSOIL Super Duty Filter. You need not change the oil as the oil is still good! You will need to add whatever oil is necessary to bring the oil level up to full on the dip stick.
Your vehicle is now set to go for 6-months or 12,500-miles (gasoline engine), whichever comes first, before the next filter change. Diesel engines should have their filters changed at 7,500-miles or 6-months, whichever comes first.
AMSOIL Fast Acting Engine Flush is a carefully selected blend of solvents and special cleaning agents that dissolve and disperse harmful deposits formed in the crankcase, and cylinder walls, pistons and rings of an internal combustion engine. When used as directed, it cleans and restores operating efficiency to valves, valve lifters, rocker arms, and pistons for improved horsepower, fuel economy, and performance.
