Dan{T.O.O}
I'm sure a lot of you read about this but for all of those who didn't.
Amsoil, the largest producers of synthetic motor oil has issued a warning about synthetic motor oil. Acting on complaints Amsoil has conducted numurous test on the synthetic motor oil and were shocked by one of there findings. Synthesized hydrocarbon,one of the main material that forms the base stock of the oil was found to have a unpredicted reaction when heated to over 150"F. They call it the "lirpa sloof" reaction. What that mean is that when the hydrocarbons are heated to over 150"F they form chrystalites which are hard micro granular almost sand like carbon particals. The problem with these particals is they don't float in the oil. They tend to adhere or stick to metal parts or components inside the engine so when changing your oil they don't expel. Over a extended period of time the chrystalites build up inside your engine and eventually causes major damage to your engine. A few reports showed that it caused the engine to completely seize. Amsoil recommends that you follow the next procedures immediately.
1. drain your oil and fill up with a single grade low viscosity 0W oil and add a bottle of oil additive.The brand is of no importance as long as it contains "zinc dialkyldithiophosphate". Drive your car for about 1000 miles.
2 drain your oil again. it should be a light color and look almost foamy. then fill your car with a multi-grade 20W50 oil which will absorb the remaining chrystalites. drive for another 1000 miles
3 drain your oil again and refill with conventional oil. Toyota recommends 5W30. If you have been using synthetic oil for three years or less then follow the recommended oil change interval. If you have been using synthetic oil for more than three years than Amsoil recommends you change your oil every 1000 miles.{1500 miles max}
to read the official report go to {copy and paste}