When I first got my car it had synthetic oil in it and it had to be driven down to me, about 2K miles. It burned about a quart of oil over that time. It was in storage during the winter but had been driven a lightly a couple months before the trip was made. The oil hadn't been changed yet so don't know if that would affect anything. Engine only has about 58K miles on it. My dad talked to a Ford mechanic who had experienced F150 and 250 vans burning oil when using a synthetic and recommended changing. Just when I do change it every 1000 miles for the first 3000 to get any synthetic out of there. Any body have experience with this? On another note I've heard once you go synthetic you can't switch back, is this true? Or is it just not recommended. Thanks for any help.