Preventive Maintenance Through
Listed below are some of the most asked questions about the GULF COAST FILTER
and running on extended oil change intervals. These answers were derived
from over 20 years experience and proven through oil analysis and many extensive
tests. These original Q&A's were first published in 1986 and have
withstood the "Test of Time." These were made possible by the
knowledge and experience gained (since 1965) by personnel associated with our
company. You'll also find these Q&As, used by permission, on several of
our dealers' web sites.
1. Why do I need additional filtration other than
2. Does oil wear out?
3. Does the color of oil have any bearing on its
4. What about fuel dilution?
5. What about solid contamination?
6. What about acid build up within the engine?
7. What about additive depletion?
8. How will the Gulf Coast Filter affect oil
additives and detergents which are contained in the new oil?
9. How often must the GCF Filter be serviced?
10. How many gallons of oil will the GCF By-Pass
Oil Filter maintain?
11. Do engine manufacturers require oil changes in
order to keep the warranty in force?
12. How does the installation of the GCF Filter
affect the engine warranty?
13. Why have the major engine manufacturers not
installed the GCF Filters at the point of manufacturing?
14. What happens if a customer installs a GCF
Filter and it does not perform as claimed by the manufacturer, GULF COAST
15. What about hydraulic filters?
16. What about Fuel Filters?
1. Q. Why do I need additional filtration other than factory
A. The reason for adding the GCF (GULF COAST FILTER) to your existing system is
to offer a means of cleaning the lube oil, thereby allowing the engine to run on
clean oil 100% of the time. The factory full flow filters on your engines now
only perform a protecting job. This job is to protect the engine from large
damaging particles. The factory full flow filter has to handle 100% of the oil
supplied to the engine for lubrication and therefore has too high of a flow rate
to actually clean the oil. By installing the GCF by-pass oil filter, in
conjunction with the full flow, the oil passes through the GCF at the rate of
only ½ GPM. This allows the oil to pass through a more dense element which
offers sub-micron filtration to clean the oil.
2. Q. Does oil wear out?
A. Oil does not wear out, it simply becomes contaminated, due to inadequate
filtration, to the point that it needs to be drained away. The actual base stock
oil never wears out, only the additives in the oil become depleted due to
3. Q. Does the color of oil have any bearing on its lubricating
A. None whatsoever. Detergent oil will turn a dark blue-black after it is
heated. Non-detergent oil will turn a reddish-brown. Most diesel engines will
turn oil black in the first few minutes of running time. The only accurate way
to determine an oil’s lubricating value or contamination level is through oil
analysis or a portable oil quality analyzer, such as the Lubri-Sensor oil
4. Q. What about fuel dilution?
A. Excessive fuel contamination within an engine can occur with injector leaks
and leaking lines. This type of excessive contamination, due to mechanical
failures, cannot be prevented by the GCF filter or any filter, therefore, an oil
drain must be performed. However, normal fluid contamination due to blow-by can
be held in check. Every liquid-fueled engine will have a certain amount of raw
fuel in its normal blow-by. The only way that fuel dilution can build up within
a healthy engine is if there is a sufficient amount of solid contamination for
the fuel molecules to adhere to. If this solid contamination is not present, raw
fuel is evaporated by the internal heat of the engine. Also, by reducing the
amount of solid contamination within the engine, blow-by is reduced to a
5. Q. What about solid contamination?
A. In diesel engines solid contamination is primarily fuel soot (carbon) from
incompletely burned fuel blowing by rings and valve guides. Some amount of
solids is quite normal and is the cause of routine oil blackening as additives
hold minutely sized particles in suspension and carry these particles to the
factory full flow filters for removal. However, the factory full flow filter is
only efficient in the range of 10 microns and up. Most of these 10 microns and
up particles combine with
themselves (AGGLUTINATE) to form larger particles that the factory filters can
remove. The GCF filter effectively removes this contamination
before agglutination can occur. This is where the GCF by-pass oil filter reduces
wear rates within the engine by removing these wear causing abrasive carbon
particles in the 1 – 5 micron range.
6. Q. What about acid build up within the engine?
A. Corrosive acid is formed primarily from sulfur blow-by in the combustion
process. When sulfur particles combine with moisture in the crankcase, acid is
formed, which in turn reduces the TBN or the amount of alkaline material in the
oil. If one of the two products needed to form this acid (sulfur particles and
moisture) is removed from the oil, excessive acid formation cannot take place.
The GCF by-pass oil filter maintains a high and acceptable TBN level by removing
the moisture in the lube oil. To combat the non-sulfuric acids that may form in
minute quantities, due to atmospheric oxidation, any small amounts of alkaline
reserve that are used is replenished at the time of filter servicing by adding
make-up oil for the GCF by-pass oil filter.
7. Q. What about additive depletion?
A. A lubrication oil consists of two major parts: BASE STOCK (or base oil) and
ADDITIVE. The base stock is the primary lubricant, and can be petroleum or
synthetic. Additives perform three basic jobs, CLEANING the engine by reducing
deposits and holding solids in suspension, ANTI-CORROSIVES, which neutralize
acids, and ANTI-WEAR additives, which plate or coat metal surfaces to help
reduce wear. Additives are designed to combat these three major areas and when
levels of contamination rise in these areas additive depletion occurs. The GCF
filter effectively keeps contamination far below levels that would warrant
additive depletion within a healthy engine, therefore the additive package of
the oil maintains a much higher level than the manufacturer's requirements.
8. Q. How will the Gulf Coast Filter affect oil additives and
detergents which are contained in the new oil?
A. The GCF oil filter does not affect oil additives or detergents in any way.
Since the oil is constantly kept clean, there is little work for most additives
to do. Those that are being used, such as anti-scuffing agents, are replaced
when normal make-up oil is added to the engine at the time of servicing of
the GCF filter. Additives are an intricate part of the lube oil and are blended
in by the refiner. The GCF filter will not filter these additives out. These
additives can only be used up, primarily due to excessive contamination within
9. Q. How often must the GCF Filter be serviced?
A. In most cases, the GCF filter will be serviced at the same interval that the
oil was being changed. EXAMPLE: 8V71 DT – 250 hours, 398 CAT – 500 hours. On
some engines (such as EMD’s) that require large amounts of make up oil, the
oil drain interval may be several thousand hours. In these engines we suggest
that a portable oil quality analyzer oil analysis be used to determine filter
change intervals. On EMD engines, however, the normal interval should be between
500 and 750 hours. (One GCF Model 0-2 for each 500 HP)
10. Q. How many gallons of oil will the GCF By-Pass Oil Filter
A. The GCF oil filter is not rated with a gallon capacity. Our filters are rated
by horsepower. The amount of contamination entering the lube oil is determined
by the horsepower of the engine, therefore, horsepower ratings are more
accurate. The smallest filter manufactured by GULF COAST FILTERS, INC. will
handle up to 250 HP and the largest filter will handle up to 500 HP. Therefore,
it may require just one or several filters for your engine.
11. Q. Do engine manufacturers require oil changes in order to
keep the warranty in force?
A. No. Engine oil change intervals are only “recommended” and not required
by manufacturers for warranty purposes. Only the condition of the oil needs to be
kept to a certain minimum specification during the warranty period. By using
the Gulf Coast By-Pass Oil Filter and monitoring the oil by oil
analysis, one can maintain an oil quality which will far exceed these
12. Q. How does the installation of the GCF Filter affect the
A. Specific acknowledgment has been received from all the major engine
manufacturers that the installation of add-on devices such as the GCF filter
will not affect their warranties.
13. Q. Why have the major engine manufacturers not installed the
GCF Filters at the point of manufacturing?
A. There are two basic reasons: First, by adding after-market products as
factory equipment, such as filters, shutdown systems, etc., they would drive up
the price of their products and take away from their competitive pricing.
Secondly, the manufacturers have planned obsolescence built into the engines so
as to enable them to keep selling replacement parts and engines to you the
14. Q. What happens if a customer installs a GCF Filter and it
does not perform as claimed by the manufacturer, GULF COAST FILTERS, INC.?
A. All of the GCF filters carry a limited lifetime warranty on workmanship and
materials for the original owner.
Our filters also carry a 100% satisfaction GUARANTEE! Purchase up to six filters from your dealer on an agreed TIME/MILEAGE basis and the filters must
perform as claimed or your investment will be refunded.* See your dealer for
15. Q. What about hydraulic filters?
A. GULF COAST FILTERS, INC. also offers hydraulic filters. The GCF Hydraulic
filter enjoys the same benefits as the GCF By-Pass Oil Filter. Not
only can you eliminate hydraulic fluid drains and reduce the amount of wear
within your hydraulic systems, but you can further reduce your filter element
inventory by using GCF filter elements for your hydraulics. One
major factor when using the GCF Hydraulic Filter is that the GCF
Hydraulic filter can remove the moisture within the fluids, a feat which most
factory hydraulic filters cannot perform.
16. Q. What about Fuel Filters?
A. GULF COAST FILTERS, INC. also offers a fuel filter/water separator. The GCF
fuel filter also has the capability of sub-micron filtration. This allows the
GCF fuel filter to remove the asphaltine particles that are in all diesel fuels.
The fuel centrifuge, factory fuel filters or other after-market filters cannot
remove the vast majority of this contamination. Asphaltine particles are made up
of abrasive carbon particles. These particles sandpaper away at the injectors
and injector pumps. Also, by using the GCF FUEL FILTER/WATER SEPARATOR, one can
extend the factory fuel filter change intervals from 4-5 times longer. While the
GCF fuel filter removes these carbon particles it reduces the amount of valve
deposits formed on the head and valve area during the combustion process. The
GCF fuel filter also uses the same element part number as the GCF Oil Filters which will further reduce your inventory cost.
*Providing the filter is installed on a reasonably healthy engine and maintained
in accordance with GCF recommendations.
FOR FURTHER INFORMATION ON PREVENTIVE MAINTENANCE THRU
SUPERIOR FILTRATION TAKE THE COST EFFECTIVE APPROACH AND GIVE YOUR GCF DEALER A