bdcardinal said:i wouldnt necessarily say that is a requirement. what a lot of people do is a double dose of ARX before making the switch.
also there is a huge myth that switching to synthetic oil will cause leaks. that is simplly not true. what actually happens is that synthetic oil has a generally higher cleaning abilty due to the higher quality additive packs. therefore it cleans more of the sludge buildup and will expose leaks that were masked by sludge.
Agreed. Synthetics do not cause leaks, they just uncover the sludge and varnish that the conventional oil left behind.
When someone is ready to switch to the good stuff, they can do so all at once.