I am an 98 RT owner and previous 98 SLT owner. Somewhere between 3500 and
4000 miles the Gas Milage goes to shit. (14 mpg to 9).
If i change the Oil, it goes backup. I have tried and tested time and time
again (24,000 miles between both trucks).
I am sticking with a change every 3000 miles. Save your engine, its just oil.
bnich@bellatlantic.net wrote:
> Martin wrote:
> >
> > DML,
> > Some was asking jon about blackstone results. I did my first
> > oil and filter change @ 2700 miles. The first change was just oil and no
> >
> > filter change @ 1500 miles. I expected the metals to be high.
> >
> > sample average
> > aluminum 2 9
> > chromium 1 4
> > iron 32 69
> > copper 70 29
> > lead 66* 178
> > tin 13* 4
> > molybdenum 25 29
> > nickel 1 1
> > manganese 5 14
> > silver 0 0
> > titanium 0 0
> > vanadium 0 0
> > boron 73* 22
> > silicon 82* 27
> > sodium 5 76
> > calcium 779 1144
> > magnesium 907* 608
> > phosphorus 824 1044
> > zinc 1046 1187
> > barium 1 1
> >
> > *=higher than average
> >
> > Comments from blackstone.
> > The high silicon is due to gaskets and sealers in the build-up.
> > Wear-in normally causes high upper end metals.
> > We found high lower end metals in your sample.
> > Check back two or three more oil changes.
> >
> > --
> > Martin Tolentino
> >
> > 99 Dakota R/T CC
>
> I just sent a sample out. I have 22,000 on my 98. All oil changes were
> with filters. The following milages aren't exact, but are in the ball
> park 1st change 6800, 2nd 9800 3rd 14,000 4th 20,000. It'll be
> intresting to see what Blackstone says. I've always heard change the oil
> every 3-4000, but the owners manual says every 7500 ? Whats everyone
> else doing? Bob
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