Hold it a min. Steve. First off, when you have a truck there is no need to put
it on jack stands to change the
oil........that is unless you have a low rider. Secondly, why wait until you
have changed the oil to enjoy the
On a higher mileage engine the Mobil 1 will break a lot of sludge free
during the first 1000 miles. I recommend changing to Mobil 1 oil AND
filters, run it for 1000 miles, change oil AND filter again, then you're
good to go every 3-5k.
Ok Doc, but is breaking loose this stuff really something I'd want to
I mean years ago, it was something we "didn't," want to do because a
theory was it would loosen things up too much. Am I right? Do you
Also, theres no harm then with residual oil mixing with this sythetic
I'll second that, and add a bit. The crud that formed in the engine in
100k can act like stop-leak, sealing small oil leaks as you go. You *may*
find "new" oil leaks that you never knew you had, if you switch now.
If you find a leak, make sure the bolts around there are torqued to specs,
before you change anything. The engine *may*, or may not, need a new
gasket or two. If so, the maintenance was needed anyway, really.
All told, I think that it's better to switch. The engine should last a
lot longer on synthetic.
I switched to full synthetic at 80,000 miles on my 94 4.3. I found
ONE oil leak that may or may not have been caused by the change to
synthetic. I switched over to Mobil 1 at around 95,000 or so, still
no leaks, but still no noticeable increase in gas mileage.
What about the part where you fish the wrench out of the drain pan, burn
your hands on everything hot and wipe freshly splashed, scalding hot oil
off your face? My procedure includes these critical steps?
Well some people just want to be different......I have only got hot oiled
once. Happened on a Jeep. Guy was "just helping", I was under it pulling the
drain plug and he decided to be a nice guy and loosen the filter. He still
is banned from the shop.
Pacifism - The theory that if they'd fed
Jeffrey Dahmer enough human flesh,
I have yet to hear an answer that I like to this question, so I'm hoping
someone here can provide it. Mobil1 oil contains graphite, it is one of
very few (?) oils that do that. Since it does have the graphite, once you
start using it, you should always use it. So, now the question, what
happens if you do switch? From what I hear, people who use it, absolutely
swear by it, so they wouldn't do it on their own. So this is more for
someone who just bought the vehicle, and didn't know the previous owner was
Only observation I can offer is that I wouldn't run it in a new engine until it
had 10-20,000 miles on it using dino oil.
I ran it from day 1 in mine and the thing burned oil at a higher-than-normal
rate for about the first 60k. Then it finally dawned on me that maybe the
Mobil-1 had interfered with the break-in process.
So I started alternating dino for awhile.
First thing I noticed was more and larger flakes of metal on the magnetic drain
plug when running dino. With Mobil-1 it was only a fine powder. With dino it
was slivers and flakes for several changes.
Second thing I noticed was that it burned almost no oil between 2000-mile
changes using dino. With Mobil-1, I always had to add a quart.
Third thing: now I'm back to using Mobil-1 and I'm getting through the
2000-mile changes without having to add any. It gets a couple holes low on the
dipstick, but never reaches "Add".
Fourth thing: Eventually the larger flakes when using dino went away, to be
replace by the fine powder.
Maybe all these obsevations were conincidences - but the picture I get is that
the dino oil allowed more wear - which was needed for the parts to bed in.
It's only an observation. I pretend zero knowledge of how things work.
Having said that, my first speculation would be that those motors are more
finely-built than what's in my 'burb.
Given the number of times I moved back-and-forth between Mobil-1 and dino and
the consistancy of what was on the magnetic drain plug I'd be hard pressed to
think it was coincidence.
Maybe somebody who knows something can offer another explaination...
I'm a little leery of mine just because I never thought of synthetics as
lubricating any better - just as holding their properties under a wider range of
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