Mixing oils, and fluids. Just a thought.

[Bob Dunahugh]

I'm big on doing what the manufactures tell us to do for a good long life o=
n the road. And that oil companies know their stuff. I just don't put addit=
ives in any oils, or fluids. If these additives make our oils so much bet=
ter. Then why didn't the oil companies add them to their oils to be better=
then their competitors? As to the TransX's. It got her to my house. 500 m=
iles. Job done with out a tow job. I'd never put it in any good working tr=
ans. So back to oils, and fluids. Oils, and fluids are always evolving to =
make them better then ever. And now there better then ever as long as we ge=
t the few that have the proper zinc for our engines. Larry's comment, and c=
oncerns about possible cross contamination of oils, and fluids. Got me back=
to thinking about this. The mineral oils have served us well. Barb's 73 GM=
C just turned 200,000 miles on it's original drivetrain. Our burned 403 78=
GMC had 152,000. Both engines have good oil pressure, and compression numb=
ers. So how are additives, or synthetic oils going to do much better. I rec=
ently checked the level of lube in my FD. It was a little low. So now the q=
uestion of. What did I put in it when I put in the 3:70. I think synthetic.=
I'm solving that question. I'm going to drain, and flush the synthetic out=
. And not use any synthetics. Problem solved. As to synthetics. Great for m=
odern engines, and transmissions. Do what makes YOU comfortable. For me. I =
like the idea of draining the junk out of my engine after each trip with t=
he used oil. Oils cheep. Bob Dunahugh 78 Royale

 

[john r. lebetski]

On a similar note the extended drain interval oils seem to not make sense in a vehicle that uses as may pounds of fuel as a GMC does. 5 quarts can
only dilute so much combustion byproducts before they start redepositing. Like moping the shop floor with clean mop bucket and detergent. Then it
starts smearing. Eventually it just moves the dirt around but doesn't clean. I'm with you on additives. In oil, it means less oil and more additive.
I wonder if just adding same ammt of dexron would have got you home!
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[Bob Dunahugh]

John. I love your mop comparison. And your bringing up diluting the oil. A=
dditives, or synthetic. can't fix that. The only cure is changing the oil o=
ften. As for the trans. I put drain plugs in all my automatic trans to make=
a change cleaner. As to the GMC. I pull my drain plug about every 10,000 =
miles. As your only draining half at a time. Every other drain job. I chan=
ge the filter. As to adding more trans fluid. Her fluid was just below hot =
add as we all do. So I filled it just above hot full. It was cool out. So s=
he got away with it there. She said the trans started working great after a=
bout 25 miles. Bob Dunahugh ________________________________ =
I'm big on doing what the manufactures tell us to do for a good long =
life on the road. And that oil companies know their stuff. I just don't put=
additives in any oils, or fluids. If these additives make our oils so mu=
ch better. Then why didn't the oil companies add them to their oils to be =
better then their competitors? As to the TransX's. It got her to my house.=
500 miles. Job done with out a tow job. I'd never put it in any good work=
ing trans. So back to oils, and fluids. Oils, and fluids are always evolvi=
ng to make them better then ever. And now there better then ever as long as=
we get the few that have the proper zinc for our engines. Larry's comment,=
and concerns about possible cross contamination of oils, and fluids. Got m=
e back to thinking about this. The mineral oils have served us well. Barb's=
73 GMC just turned 200,000 miles on it's original drivetrain. Our burned 4=
03 78 GMC had 152,000. Both engines have good oil pressure, and compressio=
n numbers. So how are additives, or synthetic oils going to do much better.=
I recently checked the level of lube in my FD. It was a little low. So now=
the question of. What did I put in it when I put in the 3:70. I think synt=
hetic. I'm solving that question. I'm going to drain, and flush the synthet=
ic out. And not use any synthetics. Problem solved. As to synthetics. Great=
for modern engines, and transmissions. Do what makes YOU comfortable. For =
me. I like the idea of draining the junk out of my engine after each trip =
with the used oil. Oils cheep. Bob Dunahugh 78 Royale

 

[roy keen]

I generally prefer synthetic oils without additives . I don' t have a problem paying a little more if it gives me a little more heat protection in
these western mountains. As far as the 3:70 gears I used 70/140 synthetic gear lube actually Amsoil the last time. The finel drive does get pretty
warm so synthetic would be good insurance here.
--
Roy Keen
Minden,NV
76 X Glenbrook

 

[Jim Hupy]

I have a temperature sending unit in my final drive. Never used to give 2
cents worth of attention to it. Now that I can see the temperature of the
lubricant, I am more aware of how much work it does. I run a 3:70 to 1
final drive ratio. I use conventional lube in it. Might change fluid this
spring, if I do, I will change to synthetic and see if the temperature is
any different.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

> I generally prefer synthetic oils without additives . I don' t have a
> problem paying a little more if it gives me a little more heat protection in
> these western mountains. As far as the 3:70 gears I used 70/140 synthetic
> gear lube actually Amsoil the last time. The finel drive does get pretty
> warm so synthetic would be good insurance here.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[Bob Dunahugh]

Roy. You are absolutely correct that synthetic oils can take more heat befo=
re breaking down. And there are applications in industries that high heat o=
ccur. But for our applications. We can never get even close to were miner=
al oils start to break down. I think mineral oil starts to break down above=
300 digress. ( Someone please correct. Memory thing. ) So to me. Why p=
ay for protection that you can never use. You can get coolant that can tak=
e extreme heat also. But why. I use mineral oils in the engine, and drivetr=
ains I race. With extreme engine heats in the 235 degree range, and pressur=
es at 8,000 RPM's. Trans, and diff get so hot. You can't touch them. I have=
nothing against synthetics. But just buy what you need. Bottom line. You n=
eed to use what puts you in YOUR comfort zone. Mine are extremely demanding=
to the point that I get oil blended to what I want by the 55 gallon barre=
l. Bob Dunahugh 78 Royale. I'm big on doing what the manufactu=
res tell us to do for a good long life on the road. And that oil companies =
know their stuff. I just don't put additives in any oils, or fluids. If th=
ese additives make our oils so much better. Then why didn't the oil compan=
ies add them to their oils to be better then their competitors? As to the=
TransX's. It got her to my house. 500 miles. Job done with out a tow job.=
I'd never put it in any good working trans. So back to oils, and fluids. =
Oils, and fluids are always evolving to make them better then ever. And now=
there better then ever as long as we get the few that have the proper zinc=
for our engines. Larry's comment, and concerns about possible cross contam=
ination of oils, and fluids. Got me back to thinking about this. The minera=
l oils have served us well. Barb's 73 GMC just turned 200,000 miles on it's=
original drivetrain. Our burned 403 78 GMC had 152,000. Both engines have=
good oil pressure, and compression numbers. So how are additives, or synth=
etic oils going to do much better. I recently checked the level of lube in =
my FD. It was a little low. So now the question of. What did I put in it wh=
en I put in the 3:70. I think synthetic. I'm solving that question. I'm goi=
ng to drain, and flush the synthetic out. And not use any synthetics. Probl=
em solved. As to synthetics. Great for modern engines, and transmissions. D=
o what makes YOU comfortable. For me. I like the idea of draining the junk =
out of my engine after each trip with the used oil. Oils cheep. Bob Dunah=
ugh 78 Royale

 

[jim kanomata1]

All the data we see in comparison of syn vs. dyno oil and my personal
observation tell me that Syn is worth the cost, plus it does not get acidy .

> I generally prefer synthetic oils without additives . I don' t have a
> problem paying a little more if it gives me a little more heat protection in
> these western mountains. As far as the 3:70 gears I used 70/140 synthetic
> gear lube actually Amsoil the last time. The finel drive does get pretty
> warm so synthetic would be good insurance here.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk
http://www.appliedgmc.com
1-800-752-7502