My 2018 Premier is currently having piston replacement done at the dealer. It is scheduled to be done by Thursday. In the meantime, I am researching more about LSPI (low speed pre-ignition) and SPI (stochastic pre-ignition) which seem to be interchangeable terms. I've read a lot about it here and at other online sources but one thing I can't figure out: Everything says if LSPI occurs it happens in low speed high-load operation. What is low speed high load operation? Nothing ever seems to detail what that means. Does low speed = low engine rpm and high load = complicated demand on the engine such as into a wind, uphill, passenger and/cargo weight?