On thumpertalk, I read about oilchange intervals of 1000-1500km max. That will be a lot of work and money when going f.x. from Europe to South Africa.

And people say that 2-strokes are not suitable for long distances, but the XR will be exactly as expensive as buying 2-T oil for a 2-stroke !!

I was always told that 2 strokes are unreliable and break down easily, and "diesels" just go on and on. Why are 4-T drivers then so nervous of a breakdown that they change oil that often ?

The XR is not even highly tuned,a 400cc with 30hp on the wheel? My trackbike a Honda NSR250 has 65hp!!

Surely these short intervals must be for enduro racing/offpiste driving etc.

For a transport distance on paved road,what would be the oilchange interval ?

__________________
Poul
May you enjoy peace and good health !

The oil change requirement has stopped a lot of people buying the smaller XRs.
You should be able to get much longer mileage if just on pavement as the engine will be used mostly at a constant rate. ie not so much harsh accelarating and braking
Buying a "better" oil such as a fully synthetic oil is meant to be bad news for BMW boxer engines longevity. However there are VERY mixed opinions on the subject. So I would buy the best available oil taking close note what is recommended for the temperature range.
I think you can safely say that the short oil change regime is meant for the worst case scenario.
1 Harsh use off road
2 Dusty conditions
3 Poor or water contaminated fuel (less lubrication)
4 Low grade oil and very hot
5 Altitude = low power and using more of upper rev range
6. Weak mixture - hot engine (again)
7. General abuse in maintenance of rest of engine
8 Run with low oil level for part of time. eg upside down after a spill

So you can certainly double the distance between oil changes. But examine the bike closely daily. You should though definitely change the filters. This is because the frequent oil changes are probably to prevent the oilways being blocked by cruddy oil and causing a seizure.
Go for it. I would.

The handbook says 600 miles (1000km) because the XR400 was originally designed as a race bike (don't snigger, this was back in 1996 x), as you surmise, more gentle 'trail' use is not going to be as hard on the engine...

However, do bare in mind that it only takes around 1.8 litres of oil in total, and is air-cooled - so that oil is working hard, especially at higher (highway speed) revs and in hot climates particularly.

I tend to change my oil and filter every 1000 miles (1600km) when general trail riding - but on a longer trip you could possible go to around 2000km... but I would be wary of this as the oil is likely to be black and thin when it comes out (ie, not much use). This summer around Europe I waited until 2800kms to change the oil on my XR650R which has a similar oil capacity, and it was like water...

As the XR400 has a dry sump engine, it is feasible to increase the oil capacity by adding some kind of extra oil tank in line with the plumbing perhaps? Even an additional oil cooler would offer a useful capacity increase, although you are limited for mounting options if using a bigger tank...

Personally I would try to change your oil and filter every 1500 miles (2400kms) as a very maximum, and keep an eye on the level each day as wildbeeste suggests...

xxx

My present XR400R get's the oil changed every 1000 mile's and the oil filter every other oil change.

This is because I intend to keep this one a long time,
it's just covered 19,000 miles in the last 2 years and runs and starts perfect.

So I will keep to this system.

That said I have in the past gone 4000 miles between oil and filter changers on a xr400.

This bike did over 32,000 miles and was still running perfect when I sold it to a friend.

He then ran it 2 years and never changed the oil once,or did any maintenance at all to it

But it was still running ok when he sold it

Worth noting as someone pointed out to me that oils in 2008 are better than 96 technology also.

I've been speaking to a guy who rode his to South Africa from Spain with only 3 oil changes.

Apparently Still running like a dream.

Id keep it within 1000-1200 miles if ridden kindly. A high quality full synthetic oil lasts way longer than a mineral or semi oil did 12 years ago.

Depends on your riding style and the temperatures really.

__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.

I tend to change my oil and filter every 1000 miles

__________________
Patrick passed Dec 2018. RIP Patrick!

before you get an off the shelf sump look into having one made, it might be cheaper.
its quite a simple milling job to knock up a 1"/1.5" spacer then all you will need would be two sump gaskets and longer bolts. the most expensive bit would be the block of alloy but shop around.

this is assuming the XR sump is a simple tray of course, and you could lower it by that much without fouling something.

and 30hp from a 400 trail bike is not bad, my xt600e doesnt give a lot more than that, these bikes are all about torque not whizzing around a racetrack.

err.....and its only had one oil change in 5 years, but thats neglect, not some wondrous new oil

__________________
dave

Good call Dave!

5 Years?

__________________
Patrick passed Dec 2018. RIP Patrick!