On Tue, 2 Feb 2016 19:27:22 +0000 (UTC), "badgolferman"
The benefit of synth oil as far as gas mileage is tiny. You aren't
getting an extra mpg due to the oil. There is also a tiny benefit to
the lower viscosity oil but again, it's not 1 mpg. The syn v dino
might be worth half a percent. The lower viscosity maybe 2%.
The only reason to use synt today is if you plan to go to extended
drain intervals. If you will be doing 6000 mi/6 mo max any regular
brand dino oil of modern spec will be more then adequate. That was
not true 20 years ago when synth had some real advantages over
"regular dino oil".
I got sick of changing oil twice a year in my 5 cars so I switched to
synt and went to 1 and sometimes 2 year old changes.
There was a guy who did a lot of oil testing on his Camaro comparing
syth to regular. There was some other guy too who did similar. Between
the two I can recall reading they found regular oil starting to poop
out at about 8000 miles. Synth generally went to between 10K (for the
worst) and 14K or more. One thing he said that was interesting was
that he pulled the sample for synth at something like 10K and it was
marginal. The car was down a quart so he only added a quart instead
of changing it. Drove it for another thousand or two miles and sent
in another oil sample. The new sample was back in the range of what
he usually saw for 3K mile tests. So either one new quart really
perked up the old 4 quarts of the "bad" test was a fluke and it really
wasn't as bad as the test suggested.
In our fleet of many hundreds of vehicles the shop found the sweet
spot for oil changes of light cars and trucks to be 6 months or 7500
miles using bulk dino oil. So on my cars still under a warranty I
stick to the manufactures "normal service schedule" of 6 months/6000
miles with whatever oil they care to use for the sale price. Watching
for specials at the dealer my average oil change costs at most $25 and
I usually get a free wash.
Not sure if you got a warranty but I would probably stick to
manufacturers recommendations maybe including letting the dealer do the
work until it expires. If you do have a warranty problem you may have
to prove you abided to the recommendations. I had a problem like this
and was doing my own oil changes and of course they asked for receipts.
I told them I did not save them but kept a repair diary and they did
I once filed a small claims court suit on Ford and the dealer for not
honoring my warranty. When I met with their lawyer and showed him my
files, they gladly settled out of court for more than expected.
I'd probably stick with the synthetic oil as apparently it does not have
nearly the additive content of regular oil and breakdown components may
be less corrosive.
Generally speaking, synthetics are less succesptible to oxidation so
they sludge less and are less likely to "burn off". That reduction in
oxidation also means less acids and other corrosive byproducts form in
the oil.This also means the oil viscosity remains more stable - with
little or no thickening of the base stock due to deterioration. The
viscosity index is inherent to the oil structure, so VI improvers are
not used as much, if at all, meaning the oil viscosity does not drop
The cold flow is much better, resulting in less cold-start wear, and
since the viscosity is stable under heat, the oil film doesn't break
down under high temperatures causing high temperature lubrication
failure and metal scoring/seizure/micro-welding etc.
Also, a dealer or manufacturer cannot refuse warranty just because you
don't have them do the service, or because you use someone else's
products, as long as they meet the manufacturer's specifications.
Running non synthetic in an engine where Ford, for instance, calls for
synthetic can render your warranty void for lubrication related
failures only. Using synthetic in place of regular oil can not foid
On 2/2/2016 5:13 PM, firstname.lastname@example.org wrote:
My problem was a head gasket but they did want to see all service records.
I know a little about the oil chemistry but not all.
I intend to get a new car next month which specifies synthetic oil.
Retired I don't put on high mileage and am more concerned about
intervals called for. I hear newer cars put out warning lights that oil
needs changing. One guy did it himself but light does not go off as you
have to do some magic to stop it.
Most new cars specify 0-20 synthetic and 15K change interval. I always
take it to dealer when reminder pops up on MID. Dealer costs little more
but oil change service includes basic inspections and tire rotation.
When trade-in time comes they give somewhat better deal knowing the
car's service history. Always I notice my old car becomes CPO and they
get sold pretty quick on dealer's used lot. And I don't want to mess
with used filter and oil to discard them properly.
Mentioned elsewhere what I was doing. Getting older I've been having
shop do oil changes. I used to do it for convenience of not being
pinned down waiting for it rather than cost but when you add taking oil
in for recycling it gets bothersome.
Dealers and shops can be annoying as while they can find undiscovered
problems they have a tendency to look too hard for stuff that could be
put off and recommend shorter service intervals.
Dealer or shop I was going to do reliable work but both will call for
oil changes at half the recommended manual specification.
I'd go to shop for tire rotation and oil change and most of the time
they would call my name at the counter, come out, ask me to sit down,
and give me a laundry list of things they think need doing. Annoying
when they say that windshield wipers need changing when I just did them
The lights have to be reset. Procedure is usually found in the manual
and is usually a couple of simple steps.
Some cars have sensors that tell you when the oil needs changing. Then
detect contaminants in the oil.
On Tuesday, February 2, 2016 at 9:07:25 PM UTC-5, Ed Pawlowski wrote:
You sure some do it that way? The cars I've been familiar with that have
a light, do it by logging your driving. Long trips, highway driving,
less frequent change. Stop and go, short trips, etc, earlier change.
I switched to Royal Purple synthetic in My 1998 Ford Taurus and noticed
a smoother running engine. It doesn't make sense, but that's the facts.
At oil change time, My 2011 Jeep Grand Cherokee will get the Royal
treatment as well.
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