Mercer Landmark provides high quality petroleum products for most any application. This offering includes:
  • Propane
  • On Road Diesel Fuel
  • Off Road/Farm Diesel Fuel
  • Heating Oil
  • Gasoline
  • Kerosene
  • High Quality lubricants which include engine oil, machine oils, Automotive fluids and grease.

See our full line of lubricants and oil products below. If you’re not sure which products are the best for your application, please call and Mercer Landmark will help you make the right selection.

Propane Services

  • 24/7/365 Emergency Technician Services & Bulk Delivery
  • Friendly certified delivery drivers, service technicians and installers
  • Professionally trained helpful office staff
  • Convenient easy scheduling
  • Quality, professional tank and propane distribution installations
  • Quick professional leak test inspections
  • Propane tank maintenance, fitting repair/replacement
  • Thorough trenching and underground gas line installations
  • Underground tank installations

Program Options

  • Summer Fill Discounts
  • Pre-pay Program
  • Fixed Price Budget Program
  • Annual Pre-Season Pre buy discounts
  • Ten month budget billing options
  • Digital tank monitor offering
  • Keep full courtesy fill option
  • Standard will call
  • Commercial/Farm Rate programs

Fuel Services

All Mercer Landmark diesel fuels are enhanced with additive treatment to address cetane, injector cleanliness, and lubricity issues. During the winter months a cold flow improve is added

  • 24/7/365 Emergency bulk delivery and maintenance services
  • Friendly professional delivery drivers, and maintenance team
  • Professionally trained helpful office staff
  • Quality, professional tank and pump installation
  • Pump/Meter maintenance, hose repair, fuel testing, technical support
  • The area’s only licensed Shell distributor
  • Awarded the Shell DPQA quality assurance recognition

Fuel Program Options

  • Fixed pricing futures program
  • Digital tank monitor offering
  • Keep full courtesy fill option
  • Standard will call
  • Ten month budget billing options
  • Volume based delivery discounts
  • Commercial/Farm Rate programs

Increased Performance for Your Diesel Engine
Keep your engine fully powered and protected with Mercer Express Power Fuel.

Engine designs continue to evolve as requirements for improving fuel efficiency and decreasing emissions get stricter every year. The modern technology in today’s engines benefits from fuel with improved performance and properties over typical ultra-low-sulfur diesel (ULSD). The precision components used in high-pressure common rail (HPCR) diesel engines benefit from a fuel with added protection against corrosion, deposit buildup, oxidation, sludge, and wear.

Cetane Express is engineered to keep engines clean, remove engine deposits, and improve the operation of all diesel-powered equipment designed for on-road, off-road, and marine use. A clean engine operates smoothly, ensuring maximum power and efficiency while reducing the risk of unscheduled  maintenance.


The shell lubricants family includes Rotella T 15/W40, which is the world’s best known and best selling heavy duty engine oil. Other trademark products include Tellus hydraulic oils, Spirax transmission and gear oils and Gadus greases.

Lubricant Services

  • Featuring a full line of Shell products
  • Farm, Commercial, Trucking & Industrial applications
  • Knowledgeable experienced sales staff to provide accurate complete recommendations.
  • Lube analysis available
  • Product Cross references
  • Complimentary lube survey and application recommendations
  • Free delivery within our market area

Heavy Duty Engine Oil (HDMO) | Diesel Engines, Trucks & Tractors

Heavy Duty Engine

Rotella T3 Fleet 15W/40
Rotella T4 Triple Protection 15W/40
(Triple Prot. has a higher additive package than the T3)
Rotella T5 10W/30 – Semi Synthetic
Rotella T6 5W/40 – Full Synthetic
Rotella T4 Triple Protection 10W/30

Country Mark
Advantage HD DEO 15W/40

Marathon Multipower 3 15W/40

Mobil Delvac 1300 Super 15W/40

*THF – Tractor Hydraulic Fluid
*AW – Anti-Wear

Automotive/Truck Gear Oil | Final Drives OR Rear Ends


Spirax S4 AX 80W/90 & 85W/140
Spirax S6 AXRME 75W/90 – Full Synthetic

Country Mark
Advantage Synthetic 75W/90

Heavy Duty Truck Transmission Oil
Spirax S6 GME 50 – Synthetic – Manual Transmission
Spirax S6 ATF A295 – Synthetic – Automatic Trans.

Country Mark
Advantage MT 50 – Synthetic – Manual Transmission

Automotive Transmission Oil
Pennzoil ATF Mer/Dex III
Pennzoil ATF LV MV – Full Synthetic
Pennzoil ATF Type F

Shellzone – Green – Automotive & Heavy Duty Truck
Rotella ELC* – Red – Heavy Duty Truck (newer equip.)
Rotella Ultra ELC* – Yellow – Heavy Duty Truck
Rotella Fully Formulated – Purple – HD Truck

*ELC – Extended Life Coolant

Passenger Car Oil (PCMO) | Gas Engines


Formula Shell 5W/20, 5W/30, 10W/30, etc
FS Syn 5W/30 & 10W/30 – Full Synthetic

Pennzoil 5W/20, 5W/30, 10W/30, 10W/40
Pennzoil SB 5W/30 – Syn. Blend, Dexos approved
Pennzoil Platinum – Full Synthetic

Tractor Universal Transmission/Hydraulic Fluids
Shell – Spirax S4 TXM (formerly know at Donax TD)
CountryMark – Advantage THF*
Marathon – 577 MaraFluid Super HT
Mobil – Mobil Fluid 424

Machine/Industrial Hydraulics
(ie. Hoists, dump trucks, bucket lifts)

Most Common:
Shell – Tellus S2 MX 32, 46, 68 or 100

Multi-Viscosity (wider temp range), dielectric:
Shell – Tellus S2 VX 15, 22, 32, 46, 68

CountryMark – Advantage AW* 32

Machine/Industrial Gear Oils


Omala S2 Gx 68, 100, 150, 220, 320, 460

Gadus S2 V220 2 – Brown – MultiPurpose
Machines, roller bearings, some truck/auto
Gadus S3 V220C 2- Red – most common
Auto & truck chassis grease, farm & construction
Gadus S3 V460D 2 – Black – 3% moly
Best for Construction & Farm equipment
Gadus S1 V160D 2 – Gray – 1% moly

Chassis grease, wheel & roller bearings


Gadus S2 V460A 2-
Best for areas exposed to excess water (repels H2O better)

Country Mark
Advantage MP Grease – equiv to Gadus S3 V220C 2

*THF – Tractor Hydraulic Fluid
*AW – Anti-Wear

Energy FAQ

How does the keep full courtesy delivery program work at Mercer Landmark Energy?

Mercer Landmark Energy uses a degree day estimating software to estimate the daily rate of propane used at your home. Once the program determines your tank level is between 20-30% our office staff will dispatch a driver to deliver your propane. This eliminates the need for our customers to track their tank levels. Also courtesy fill customers receive 10 cent discount per gallon for every delivery made. If your propane system includes unusual use appliances like a generator or pool heater, please ask for our digital tank monitoring system.

What time of the year can I pre-buy propane?

Mercer Landmark Energy offers a pre season pre-buy option during the months of June, July, & August. This leaves us enough time to forecast the propane demand for our upcoming heating season. We also open our budget billing program and summer fill discounts during this time.

What happens if I don’t use the propane gallons that I paid for during pre-buy?

The leftover dollar amount on your account after April will roll into the next year’s balance. You can use this credit to pre-purchase propane for the following year or use it for a summer fill.

If I sign up for the monthly budget program, when will my first payment be due?

When you call to sign up for our budget billing program, our office staff will work with you to estimate your annual propane usage. Once this is determined, we will divide the cost of your total propane usage into 10 monthly payments. Your first payment will be due before the end of July and your final payment for the year will be in April.

Do you fill customer owned propane tanks?

Yes, Customer owned propane tanks receive a 10 cent discount per gallon. Before a driver can make a delivery for the first time it is required that a technician perform a whole home systems test/leak inspection and document your tank information.

Do you offer any high volume propane contracts?

Yes, please call our office (419) 678-4811 and ask to speak with someone about high volume contracts. We would be glad to hear from you and discuss how we can help.

Do you set tanks for propane generators only?

Yes. However, because of the low volume of propane used with these set ups, we require our customers purchase the tanks rather than lease. Please call our office (419) 678-4811 and we can provide you pricing on new and used propane tanks.

Do you offer online bill payment?

Unfortunately, currently we do not provide an online bill payment option for our customers. However, we are diligently working on providing this benefit and plan to have it available for use shortly.

How does the fuel fixed price futures program work at Mercer Landmark Energy?

The fixed pricing program is based on the futures market, gallons can be booked up to a full year ahead. Please call for more information.


Joe Hart
Energy Manager
Office: (419) 678-4811
Toll-free: (800) 845-6405
Emergency: (888) 840-7487

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Celina: (419) 586-7443
Elgin: (419) 667-2901
Rockford: (419) 363-3143

Come to any of these locations and our friendly staff will fill your grill bottles in a timely manner.