Do I have to use a "Euro" Castrol oil or can I just use a good spec 0w‐20? I can't find "Euro" spec locally...

 

Lots of threads and lots of argument on this topic. I'm of the opinion that any good 0W-20 (I would also consider 5W-20 in your hot climate) is probably OK. Jaguar will tell you only their spec 0W-20 is acceptable but they have a conflict of interest with the oil companies they worked with to develop their "standard", so you should consider that. Some people argue that they moved from recommending 5W-20 to 0W-20 to meet CAFE standards, some people argue it was to extend the life of the timing chain tensioners because the oil pressure feed hole in the tensioners is so small (I'm in this camp).

Oil change interval and being gentle on the car while it is warming up is more relevant anyways.

 

Warming up, this means wait and let the rpms lower after startup before moving?

 

You need the oil standard. The URO thing is meaningless.
Jaguar publishes the spec and you can decide to follow that recommendation or not.

As Jaag-drivah mentions Jaguar moved from 5W-20 to 0W-20 as time went on. The reason for doing so have been several as again he mention's. I am also of the opinion that is was because of the timing gear issues/problems BUT Jaguar never really stated any reasons why. They do state for increased gas mileage and reduced emissions but that's it.

Also as he mentions and I have posted before is that Jaguar signed a world wide business agreement with BP. BP makes Castrol. So ALL the lubricants that Jaguar recommends will always be a Castrol product if possible. This was NOT a technical decision but a business decision. Nothing wrong with that but understand where it came from.

Attached is a tech bulletin from Jaguar around 2018 when they changed to the 0W-20 oil.
I use a Mobil 1 0W-20 oil that meets the JLR spec.
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It means don't drive the car hard or redline it when it's below operating temperature. Oil takes awhile to warm up and doesn't flow as easily until it does. Exercising some mechanical sympathy and reducing load on the engine during these warm up periods reduces wear.

 

I always liked this post that technically explained a good reason why you should only used oil that adhered to the JLR spec since the oil was developed for these engines. Granted the old spec is referenced in this old post: Posted by Member “Queen and Country” from the UK on the F-Type Forum 02-22-2019

“Jaguar has a Patent on the cam mechanism that not a lot of folks know about. It even licenses this technology to Ford.
https://patents.google.com/patent/US7841310B2/en
Basically, if you open an engine from a regular car or even previous Jaguars, you will find that oil naturally cooks on to many surfaces. But it does not matter. These engines are fairly low tech when it comes to oil.

Your Jaguar engine gets amazing performance (low end torque) by doing things with oil that no other manufacturer does.
It’s like a Swiss watch of delicate parts. The patent above is for a small pin that slides in and out. Oil moves this pin. No other engine in the world other than JLR and Ford have it.
What do you think will happen if you use oil that cooks quickly (becomes coke). Where after you turn the engine off you have heat soak.

Your engine is not built the same as other engines.
In addition to the usual lubrication and cooling, it also needs 3 things from the oil.
1. Good cleaning abilities
2. Ability to clean after long term use.
3. Not leave too much deposit.

Also posted by Q and C

“I can explain it in a simple way.
In other cars oil is used for lubrication, cleaning and cooling only.
In our cars it’s also used for controlling the timing of the engine.”

Lastly, in the owner’s manual it reads “Castrol is "recommended" oil. WSS-m2c925A or STJLR51.5122 is the REQUIRED spec oil.

 

I use these kits with the correct spec for our cars. And I do oil analysis and the engines have great results. Plus, after paying for the first kit, the oil change kits are free, minus return shipping with their lifetime replacement guarantee.

https://www.fcpeuro.com/products/jag...hle-lm20410kt2

 

Nostyle, I have recently made the switch away from the Castrol Edge Gold as finding it has become practically impossible. I have switched to LiquiMoly 6600. This oil has met the Jag standard of STJLR51.5122 and is written on the bottle. I get it through Amazon for $50 a 5 liter bottle delivered to my house. I have used it a few times and it appears to work very well. That should give you atleast a second option for something to find locally. I know getting things into the island can be hard (had 3 years of first hand experience). This is where you can order the oil early and keep it in hot standby when you need it.