Castrol is here to serve every driver, every motorcyclist and every industry on Earth. That means creating high performance oils, lubricants, fluids and greases for every application you can imagine.
Castrol is here to serve every driver, every motorcyclist and every industry on Earth. That means creating high performance oils, lubricants, fluids and greases for every application you can imagine.
in 17 offers
The lowest price for Castrol 15W-40 CJ-4 E9 RX Super Engine Oil 20 Litre (3418280) right now is $144.17 at The Haggarty Group, compared across 17 retailers.
The all-time low was $49.91 on 12 Sept 2024 — today's price is 189% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Castrol 15W-40 CJ-4 E9 RX Super Engine Oil 20 Litre (3418280)
Castrol is here to serve every driver, every motorcyclist and every industry on Earth. That means creating high performance oils, lubricants, fluids and greases for every application you can imagine.
Castrol is here to serve every driver, every motorcyclist and every industry on Earth. That means creating high performance oils, lubricants, fluids and greases for every application you can imagine.
Prices last updated 7 Sept 2026.
Last updated at 07/09/2026 21:43:04
Rx Super 15w-40
Castrol RX Super 15W-40 Engine Oil CJ-4/E9 20L - 3418280
Delivery between 10–18 Sept $9
3418280 Castrol RX Super 15W-40 20L
Castrol RX Super 15W-40 CJ-4/E9 Engine Oil 20L - 3418280
Delivery $38.50
Castrol RX Super 15W-40 CJ-4/E9
Delivery between Wed – Sat $40
CASTROL RX SUPER ENGINE OIL 15W-40 CJ-4/E9 20L - CAS3418280
Western Filters Castrol Oil RX Super 15W-40 CJ-4/E9 - 20L Drum 3418280
Delivery between 10–18 Sept $21.75
CASTROL RX SUPER 15W-40 CJ-4/E9 20LT
Castrol RX Super Diesel CJ-4E9 Engine Oil - 15W-40, 20 Litres
Delivery between 10–15 Sept $20
Castrol Rx Super 15w-40 Cj-4/e9 Engine Oil 20l 3418280
Free delivery
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originally posted on supercheapauto.com.au
This oil will drive the ladies wild.Having the ability to slide your piston inside the cylinder with just the right amount of friction is the key to a successful combination within the chamber. There is nothing worse than an oil pressure warning light coming on, well maybe a well done steak and a flat beer is worse, and your ring gear breaking along with your roller bearings overheating. Using this lube with help prevent such an occurrence.
originally posted on supercheapauto.com.au
One of the best diesel oils available, I’ve used RX Super for over 25 years, from a clunker 40 series 3B Cruiser to the current 80 series HD-T. Tried a few other ‘name brands’ when the pricing was ridiculous, but none could sustain the constant oil pressure between services that the old faithful RX does.
originally posted on repco.com.au
Excellent product. Car runs so smoothly and second time we used it.
| Oil Composition | Mineral |
| API | CJ-4 |
| CAT | ECF.3 |
Rx Super 15w-40
Castrol RX Super 15W-40 Engine Oil CJ-4/E9 20L - 3418280
Delivery between 10–18 Sept $9
3418280 Castrol RX Super 15W-40 20L
Castrol RX Super 15W-40 CJ-4/E9 Engine Oil 20L - 3418280
Delivery $38.50
Castrol RX Super 15W-40 CJ-4/E9
Delivery between Wed – Sat $40
This oil will drive the ladies wild.Having the ability to slide your piston inside the cylinder with just the right amount of friction is the key to a successful combination within the chamber. There is nothing worse than an oil pressure warning light coming on, well maybe a well done steak and a flat beer is worse, and your ring gear breaking along with your roller bearings overheating. Using this lube with help prevent such an occurrence.
One of the best diesel oils available, I’ve used RX Super for over 25 years, from a clunker 40 series 3B Cruiser to the current 80 series HD-T. Tried a few other ‘name brands’ when the pricing was ridiculous, but none could sustain the constant oil pressure between services that the old faithful RX does.
Excellent product. Car runs so smoothly and second time we used it.
Quality Australian formulated product. Been using this in my Non DPF 200LC since new. Minimal oil usage in 190K. Change oil at 5K intervals. Excellent sale price at Repco, easy online ordering and simple pickup. Excellent helpful staff at my local outlet.
Always a good oil for old classic diesel engines especally at low revsI used it for years and try to by it when on sale and stock up for the next oil change .
I find Castrol oils and lubricants suit my needs perfectly. Supercheap is a great supplier of Castrol products with good stock on hand and very competitive pricing.
Good value product I have been using for years in my car, would not use anything else
I have used Castrol oil in my 1998 Toyota land cruiser diesel since new. For 22 years of motoring this oil and its processor has performed faultlessly .For me Castrol oils are the only way to go for engine longevity and internal protection.
Used only Castrol Rx plus in f250 since new.Just clocked 690000 km and engine internals are near perfect.At 100000km had oil tested after a 10000km service with unbelievable results.Was told oil would give perfect lubrication for 20000km.Done oil and filter at 15000km intervals since.With 6 of these vehicles working hard daily,the $ saved in oil,servicing,repairs and downtime is mind blowing.Only CASTROL products get used on all my company and personal vehicals,even my lawnmower
I've been using Castrol RX Super Oil in my diesel Land Rovers for twenty years, the oil changes are done with a oil filter replacement at between 7,000 to 10,000 Kilometres,The Discovery 1994 TDi300 has done just over 680,000 kilometres and does not need a top up between changes.The Defender 1995 TDi300 has done 265,000 kilometres and it also has no problems.
| Oil Composition | Mineral |
| API | CJ-4 |
| CAT | ECF.3 |
