I get confused sometimes is the real reason. I thought there was some weird crossover where there were some D1 and D2 of the same model year. I've read too much and my brain melted years ago.
I looked back in to it; it's 1998 I was thinking of where you could technically get a series 1 or 2. Sorry! No hate for the 99rs!

 

Would a 99-02 cooler not work ? Did they come with a thermostat as well ??
Im seriously thinking of adding one. When the local club goes off-roading it’s a 3 hour drive plus 4-6 hours trail runs. That’s a lot of engine work

 

@redwhitekat it would but we lack a part in our front covers (30 and 04) if you search for oil coolers you will find a thread about it

 

As an owner of an 01 with an oil cooler, I was shocked when I first got junkyard parts from an 04 and saw it did NOT have an oil cooler! So....you're getting more power from the same block and you want to....remove cooling??? British engineering at it's best I guess.

 

99-04 front timing covers should be the same (ERR6816 or ERR6438). I’ve done several oil cooler upgrades & just needed the OEM oil lines & cooler. Maybe I got lucky & had D2’s with older front covers, but it worked with no issues.

 

My new front cover has the ports for the lines to plug into I believe

 

Timing covers of 03/04 are different. It is the same part number and looks exactly the same, but there is a tiny part missing inside. I learned it the hard way: added an oil cooler, but it had zero effect on oil temperature. A relief valve piece is missing (found that out here -> https://landroverforums.com/forum/di...f-valve-86314/ ), so the oil always bypasses the cooler.

A sandwich adapter works fine. If it has a thermostat, even better.

- Earl's 502 sandwich
- after market cooler (not much more expensive than one from a junkyard, but new)
- compression fittings: https://landroverforums.com/forum/di...00/#post707553
- bunch of AN -8 fittings and hose (all Summit)

Here are some pictures and test report (pls. scroll down):
https://landroverforums.com/forum/di...ys-cold-95865/

This is not the final solution, I need to change the hoses because of ugly routing and not ideal fittings. DIY hose ends work fine for proof of concept, but for the final solution I will get something professionally crimped.

 

Thanks for this

 

So oil temp is higher at highway speeds you found ?

 

At hwy speeds, slight hills, fully loaded, hot outside (which is a typical scenario in Western US when going on a road trip in summer with family and lots of gear). This is where I observed it, oil got way to hot without cooler (dino oil breaks down at these temps already) while coolant stays at 190F. There will be other scenarios like decent off-roading (which I haven't done so far). To make the D2s with the stronger engines but without oil cooler was a bad engineering decision imho. For sure they had their reasons.