Given that the two match, I would definitely follow that recommendation so far as the change frequency.  So far as this being a $300 engine, is that what Bostiq charged?  I think not.  mcneely

---- Craig Cowan <phishman068@GMAIL.COM> wrote:
> Please do not take what I am about to say as advice! It is simply what I've been doing.
>
> I have about 10,000 miles on my zetec a oil over the course of about a year and a half. I last pulled the dipstick to check in August, and that was the first time in about six months.
> I even moved this engine from a different Van in that time, and did not change or check the oil while the engine was on the stand.
>
> The engine has mobile 1 synthetic, and I put a new filter on it sometime last year. I may do that again soon.
>
> What am I tryin to prove?
> Nothing.
> The last oil analysis I had came back acceptably, and I just don't see the need to baby a $300 engine block. Oil isn't cheap these days, and I really hate changing it. Yes, I actually enjoy changing engines more than I enjoy changing oil
> Am I crazy? Maybe. Please don't tell me if I am though, it will ruin the surprise.
>
> Your zetec is built well. The bostig sump holds a lot of oil. Modern oil rocks.
>
> -craig
>
>
> On Dec 6, 2012, at 1:59 PM, JarrettAnthony Kupcinski <kupcinski@GMAIL.COM> wrote:
>
> > Every 5000 miles/6 months assuming normal operating conditions. 3000 miles for extreme service conditions. The Bostig recommendation matches Ford's.
> >
> > -Jarrett K
> > 89 Westy powered by Bostig
> >> What did the engine manufacturer recommend for the engine when it was new in a factory installation?
> >>
> >>> Bostig recommends an oil change every 3 to 5K using synthetic oil. Since

--
David McNeely