Oil and filtration are the same job done twice. The filter takes out what the oil is carrying; the oil decides how much it can carry in the first place.
A filter can only hold what the oil brings to it. Run the right oil and the filter spends its life catching ordinary wear debris. Run the wrong one — too thin for the heat, or short on the additives that keep soot in suspension — and the filter blocks early, the bypass valve opens, and the engine runs on unfiltered oil without telling anyone. That is why we sell both.
Reading a grade. On a 15W-40, the 15W is how the oil behaves cold, at start-up, and the 40 is how it behaves at operating temperature. A lower first number flows sooner on a cold morning; the second number has to match what the engine was designed for. A 15W-40 and a 20W-50 are not interchangeable just because both say 40 or 50 somewhere.
The API category matters more than the grade. Printed on the back as a two-letter code — CK-4, CJ-4, CI-4 for diesel — it tells you which generation of engine the additive package was designed for. Newer categories are generally backward compatible; older ones are not forward compatible. An engine that asks for CK-4 will not be happy on CI-4, whatever the viscosity says.
Change the filter with the oil, every time. A used filter is holding a quantity of dirty oil and all the debris it has already caught. Putting fresh oil through it starts the new interval part-way used up. The cost of the element is trivial against the cost of the oil, let alone the engine.
The last two groups are not engine oils. Shell Corena is a compressor oil, formulated for oil-flooded rotary screw and sliding vane air compressors. Caltex Rando HD is a hydraulic oil, for vane, piston and gear pumps. Both are ISO VG 68, which is a different scale from the SAE grades above, and neither belongs in an engine. They are here because the machines that need them are the same machines our filters go on.
Intervals come from your engine manual, not from us. They depend on the engine, the duty, the fuel and the dust, and in Karachi conditions the dust alone can halve a figure quoted for a European fleet. If you are not sure what your engine asks for, send us the make, model and serial and we will look it up with you.
10 grades across Chevron Delo, PSO, Valvoline, Mobil, Shell, Caltex.
Delo heavy duty diesel oils are built around the ISOSYN additive technology.
Chevron Delo
Heavy duty diesel engine oil
The standard heavy duty diesel grade. The 15W is how it behaves at start-up, which is where most engine wear happens, before oil pressure reaches the top end.
Chevron Delo
Engine oil
Supplied in the Chevron pail. The label reads Delo 710 LS, which is a specific product in the Delo range rather than a general heavy duty grade, so check it against your engine before ordering a drum.
Blended locally by Pakistan State Oil. Supply is the practical advantage: it is on the shelf when imported stock is not.
PSO
Heavy duty diesel engine oil
PSO diesel engine oil, blended locally. On the shelf when imported stock is not.
PSO
Generator engine oil
Formulated for generating sets rather than road vehicles. A genset runs at constant speed and constant load for long periods, which is a different duty from a truck engine, and the oil is built for it.
Premium Blue is the heavy duty diesel line. The Champ 4T below it is a motorcycle oil, and the two are not interchangeable.
Valvoline
Heavy duty diesel engine oil
Premium Blue is the heavy duty diesel line, widely specified for mixed fleets where one oil has to suit several makes of engine.
Valvoline
Four-stroke motorcycle oil
A motorcycle oil, not a diesel engine oil. 4T means four-stroke motorcycle, and the additive package is built for a wet clutch and a shared gearbox. Do not put it in a truck or a generator.
Delvac is the heavy duty diesel line. The Super Moto 4T below it is a motorcycle oil.
Mobil
Heavy duty diesel engine oil
Delvac is the heavy duty diesel line and is named directly in a number of engine builders documentation.
Mobil
Four-stroke motorcycle oil
A motorcycle oil, not a diesel engine oil. 4T means four-stroke motorcycle. It shares a sump with the gearbox and the clutch, which is why it is formulated differently from the 15W-40 above.
Compressor oil, not engine oil. Corena is the air compressor line, and the S3 R grade is the one normally specified for oil-flooded rotary screw and sliding vane machines.
Shell
Rotary screw compressor oil
For oil-flooded rotary screw and sliding vane air compressors. ISO VG 68 is an industrial viscosity scale and does not translate to an SAE engine grade. Drain intervals come from the compressor manual. Pairs with the separator elements on our compressor page.
Hydraulic oil, not engine oil. Rando HD is a general purpose hydraulic line, zinc based, for industrial and mobile equipment.
Caltex
Hydraulic oil
For vane, piston and gear pumps, where pressures exceed 1000 psi. An industrial grade, not an SAE engine grade. If your system calls for an ashless or high viscosity index oil instead, tell us and we will match it.
The quickest way to get the right thing is to tell us what it is going into: the make, the model, and what it does all day. We will tell you what it takes, confirm what is on the shelf, and quote it. If your engine manual names a specification, bring that and we will match it exactly.