I have a '97 Zetec, switched to synth at cca. 120k now has
155k, no problems, no oil consumption.
Before that I was strict on changing oil on every 3k miles,
when gone synthetic I changed first after 2k then 3k, after
that 5k.
The last 2 times I used synth blend because I think it's good
enough - when I drained it after 5k it was still in very good
condition.
Tiv
