Hi guys. There has been a lot of discussion on bitog on adding oil additives like Lubegard and others. Some say it's ok, some say it alters the add pack of the oil. Yet most oil producers like Pennzoil Valvoline and others say their oil can be mixed with any synthetic or conventional oil. Won't that also change the add pack of their oil??. Oil producers i believe also do not recommend additives. There are folks here in bitog that mix different brands of oil and different weight of oil. Is there a difference between mixing oils and adding additives?? Just curious.