wow the switchover thing is good to know. I thought you guys were gonna say cuz there's more built up sludge and junk in there and synthetic can't hold as much but I didn't know it's cuz of that reason. I bet they make an additive for that. Actually, valvoline makes a special high mileage version that has different stuff in it to hold more dirt and do who knows what so that might be safe. I use Valvoline regular full synthetic cuz it had 73,000 miles last time :D but next oil change I'm going for the high mileage version. And yes, I know, that brand is unbelievably expensive but I like it
I think it's over $5 per quart.