One way to know for sure is to do an oil ananlysis at your oil changes. Even
if you just put on a new filter and top it off you could send alittle oil off
to the lab. it will tell you the condition of the oil, content of gas and
water, how dirty it is, and well as what type of metals are in it that can
help you figure out your engines condition. After a few tests @ $15 a pop you
will now what you need for your van and driving habits.

Todd Thompson
84 Westy
Wash. DC