Castrol GTX Diesel 15W-40 Engine Oil 5L - 3437069
Castrol GTX diesel 15W-40 Engine Oil 5L Castrol GTX is one of the world's most trusted engine oils. It is more than just oil. It's liquid engineering that provides extra protection against diesel engine problems, like soot and harsh deposits that your engine faces every day. Why is this important? Because soot and harsh deposits can make your oil thicker, block oil ways, cause wear and decrease performance. Help extend the life of your engine with Castrol GTX DIESEL. Browse online using our handy Rego Search tool to find the best Castrol oils for your application or come in store today and speak to one of our friendly staff. Changing your oil will also need you changing your oil filter to fully protect your engine and maximise the performance of your Castrol oil. When it comes to Oils and Fluids, the range doesn't just stop at Magnatec, GTX or Edge, Repco stock a range of quality Castrol Grease, Transmission Fluid, Gear Oil, Lawnmower and Motorbike Oil, Marine Oil and Additives all designed to protect and maximise the performance of any application.
Castrol GTX diesel 15W-40 Engine Oil 5L Castrol GTX is one of the world's most trusted engine oils. It is more than just oil. It's liquid engineering that provides extra protection against diesel engine problems, like soot and harsh deposits that your engine faces every day. Why is this important? Because soot and harsh deposits can make your oil thicker, block oil ways, cause wear and decrease performance. Help extend the life of your engine with Castrol GTX DIESEL. Browse online using our handy Rego Search tool to find the best Castrol oils for your application or come in store today and speak to one of our friendly staff. Changing your oil will also need you changing your oil filter to fully protect your engine and maximise the performance of your Castrol oil. When it comes to Oils and Fluids, the range doesn't just stop at Magnatec, GTX or Edge, Repco stock a range of quality Castrol Grease, Transmission Fluid, Gear Oil, Lawnmower and Motorbike Oil, Marine Oil and Additives all designed to protect and maximise the performance of any application.
Castrol GTX diesel 15W-40 Engine Oil 5L Castrol GTX is one of the world's most trusted engine oils. It is more than just oil. It's liquid engineering that provides extra protection against diesel engine problems, like soot and harsh deposits that your engine faces every day. Why is this important? Because soot and harsh deposits can make your oil thicker, block oil ways, cause wear and decrease performance. Help extend the life of your engine with Castrol GTX DIESEL. Browse online using our handy Rego Search tool to find the best Castrol oils for your application or come in store today and speak to one of our friendly staff. Changing your oil will also need you changing your oil filter to fully protect your engine and maximise the performance of your Castrol oil. When it comes to Oils and Fluids, the range doesn't just stop at Magnatec, GTX or Edge, Repco stock a range of quality Castrol Grease, Transmission Fluid, Gear Oil, Lawnmower and Motorbike Oil, Marine Oil and Additives all designed to protect and maximise the performance of any application.
Castrol GTX diesel 15W-40 Engine Oil 5L Castrol GTX is one of the world's most trusted engine oils. It is more than just oil. It's liquid engineering that provides extra protection against diesel engine problems, like soot and harsh deposits that your engine faces every day. Why is this important? Because soot and harsh deposits can make your oil thicker, block oil ways, cause wear and decrease performance. Help extend the life of your engine with Castrol GTX DIESEL. Browse online using our handy Rego Search tool to find the best Castrol oils for your application or come in store today and speak to one of our friendly staff. Changing your oil will also need you changing your oil filter to fully protect your engine and maximise the performance of your Castrol oil. When it comes to Oils and Fluids, the range doesn't just stop at Magnatec, GTX or Edge, Repco stock a range of quality Castrol Grease, Transmission Fluid, Gear Oil, Lawnmower and Motorbike Oil, Marine Oil and Additives all designed to protect and maximise the performance of any application.
in 17 offers
The lowest price for Castrol GTX Diesel 15W-40 Engine Oil 5L - 3437069 right now is $18.33 at Repco.co.nz, compared across 10 retailers.
The all-time low was $18.33 on 2 Sept 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 2 Sept 2026.
Last updated at 02/09/2026 07:30:57
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Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
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originally posted on repco.co.nz
15W-40 is the recommended specification for my diesel engine. API CH-4 (and above) is what i need. Can't go wrong with Castrol, a proven high quality and in-spec product.I purchase the bulk of my engine-oils from Repco (whilst on special and/or catalogue deals), Repco offer good price's along with great service in-store and/or online.
originally posted on supercheapauto.com.au
The oil at this stage appears to be doing it job, but time will tell . but generally Castrol oils are of good quality and was recommended by the staff member, who I feel can be trusted.
originally posted on repco.co.nz
Castrol GTX Diesel has a higher amount of ZDDP(which prevents engine wear) compared to most other diesel oils, which is a good thing. Just don't use it if your vehicle has a DPF
| Application Type | Diesel |
| API specification | SP |
| Warranty | Limited |
Castrol GTX Diesel 15W-40 Engine Oil 1L - 3437070
Castrol GTX Diesel 15W-40 Engine Oil 5L - 3437069
Castrol GTX Diesel 15W-40 Engine Oil 10L - 3437068
GTX DIESEL 15W-40 5L
Free delivery by 14 Sept
Castrol GTX 15W-40 Diesel Engine Oil 5L
15W-40 is the recommended specification for my diesel engine. API CH-4 (and above) is what i need. Can't go wrong with Castrol, a proven high quality and in-spec product.I purchase the bulk of my engine-oils from Repco (whilst on special and/or catalogue deals), Repco offer good price's along with great service in-store and/or online.
The oil at this stage appears to be doing it job, but time will tell . but generally Castrol oils are of good quality and was recommended by the staff member, who I feel can be trusted.
Castrol GTX Diesel has a higher amount of ZDDP(which prevents engine wear) compared to most other diesel oils, which is a good thing. Just don't use it if your vehicle has a DPF
Castrol oil has always been No.1 for performance. During my many years of motorcycle racing both road and enduro I've always depended on Castrol for both four stroke and two stroke machines. It goes without saying that I use it for my diesel 4 wheel drive and petrol cars without a problem. Sure its a bit more expensive than other brands but its a price I gladly pay for superior performance and peace of mind.
To have in stock and carry the 1 litre size is good. An issue was that it was located on the bottom shelf and difficult to find being a smaller container surrounded by larger containers it really should be at better height and viewing line.
| Application Type | Diesel |
| API specification | SP |
| Warranty | Limited |
