RX MONO 40 CF – 20 Litre

Heavy-Duty SAE 40 Monograde Diesel Engine Oil Recommended for Detroit Diesel Two-Stroke Engines

Product Overview

RX MONO 40 CF is a high-quality, monograde SAE 40 heavy-duty diesel engine oil formulated to deliver reliable performance in a broad range of diesel engine applications. Specifically designed for use in older diesel engine technologies and certain two-stroke diesel engines, it provides dependable wear protection, deposit control, and oil life under demanding operating conditions.

This oil is especially recommended for Detroit Diesel two-stroke engines, which require monograde lubricants with lower ash content and controlled detergency to ensure optimum engine performance, reduced deposits, and reliable lubrication. RX MONO 40 CF meets API CF performance standards, offering proven protection for legacy equipment still operating in industrial, marine, agricultural, and transport fleets.

Packaged in a convenient 20-litre drum, RX MONO 40 CF is a practical choice for workshops, fleet operators, marine operators, and contractors seeking consistent, OEM-recommended performance for older diesel equipment.

Key Features and Benefits

1. Recommended for Detroit Diesel Two-Stroke Engines

RX MONO 40 CF is suitable for two-stroke diesel engines from manufacturers such as Detroit Diesel, particularly the Series 53, 71, 92, and 149 models. These engines require a monograde SAE 40 oil meeting API CF or MIL-L-2104C standards, with specific detergent levels to minimize deposit formation and maximize performance.

2. Superior Wear Protection

The oil’s balanced formulation ensures strong protection of vital engine components including pistons, rings, liners, valves, bearings, and camshafts. This reduces metal-to-metal contact and extends engine life even under heavy-load conditions.

3. Effective Control of Deposits

RX MONO 40 CF provides reliable control of piston deposits, varnish, and sludge. Its detergent-dispersant additive system ensures cleaner engines, improved combustion efficiency, and reduced oil consumption, supporting smoother performance in older engine designs.

4. Optimized Performance for Moderate to Severe Duty Cycles

Designed to operate effectively under a wide range of temperatures and engine loads, RX MONO 40 CF maintains its viscosity and film strength to deliver consistent lubrication, reducing the risk of oil breakdown or excessive engine wear.

5. Corrosion and Oxidation Resistance

The oil’s formulation includes additives to protect against the corrosive effects of combustion by-products and oxidation during operation or equipment storage, helping maintain cleanliness and reliability in legacy diesel engines.

Applications

RX MONO 40 CF is suitable for a broad range of applications where a heavy-duty SAE 40 monograde diesel engine oil is recommended, including:

• Detroit Diesel two-stroke engines used in trucks, buses, marine vessels, stationary power generation, and industrial machinery

• Older four-stroke naturally aspirated or turbocharged diesel engines where API CF or earlier specifications are required

• Off-highway equipment such as construction machinery and agricultural tractors designed for SAE 40 monograde oils

• Stationary industrial engines operating on diesel fuel

• Marine propulsion and auxiliary engines where an SAE 40 CF oil is specified

It is not recommended for modern low-emission engines requiring multigrade oils or meeting API CH-4, CI-4, CJ-4, CK-4, or higher performance categories.

Recommended OEM Compatibility

RX MONO 40 CF meets or exceeds performance requirements for:

• Detroit Diesel two-stroke diesel engines (Series 53, 71, 92, 149)

• Equipment manufacturers specifying API CF or MIL-L-2104C level oils

• Suitable for use where Caterpillar Series 3 requirements apply

Typical Physical Properties

Note: Properties are typical of current production and may vary slightly.

Performance Summary

• Specifically recommended for Detroit Diesel two-stroke engines requiring SAE 40 monograde CF oils

• Outstanding wear protection under high load and severe service conditions

• Excellent detergency to maintain piston cleanliness and control sludge

• Reliable protection for older-generation diesel engines still in service

• Supports effective maintenance of legacy engines operating under constant load or high temperature conditions

Packaging and Storage

Pack Size: 20 Litres
Container: Industrial-grade plastic drum with secure lid and pouring spout

Storage Recommendations:

• Store in a cool, dry, well-ventilated location

• Avoid contamination with water, dust, or other fluids

• Shelf life: 5 years when stored unopened in appropriate conditions

Health and Safety:

• Avoid prolonged or repeated skin contact

• Use appropriate PPE when handling

• Dispose of used oil in accordance with local environmental regulations

• Safety Data Sheet (SDS) available on request

Why Choose RX MONO 40 CF?

• Specially formulated to protect Detroit Diesel two-stroke engines, meeting OEM lubrication requirements

• Reliable performance in older trucks, buses, industrial powerplants, and marine applications

• Competitive price point combined with robust protection

• Suitable for workshops maintaining fleets of legacy diesel equipment

• Simplifies inventory for operators running older machinery with different lubrication requirements than modern engines