DS800X Rally Engine Oil & Secondary Oil Filter Change

Unresolved oil-filter torque: The owner manual, physical PDF page 101, specifies 11 N.m for the secondary oil filter. The engine manual, physical PDF page 23, specifies 12 N.m. We cannot verify which value is correct; no torque is selected here.

The DS800X Rally uses a wet-sump lubrication system with a single drain plug at the bottom of the case and a secondary oil filter (a spin-on cartridge) that should be replaced at every regular oil change.

Per the official service schedule, oil + secondary filter is replaced at every service interval: first service at 1,000 km, then at 10,000 km, 20,000 km, 30,000 km and onward, or every 12 months, whichever comes first.

The KEL800 engine workshop manual gives conflicting minimum API oil grades: SG or higher on PDF page 8, but SL or higher on PDF page 24. We cannot verify which minimum grade is correct. The manual specifies a viscosity of 10W-40 and a JASO rating of MA.

Specifications at a glance

API SL+ and non-energy-saving oil matter on a wet-clutch motorcycle. Energy-saving oils (marked with a green "Resource Conserving" stripe on the API donut) contain friction modifiers that cause clutch slip. JASO MA excludes those modifiers, so buy oil that prints both API SL+ and JASO MA on the bottle.

The DS800X Rally uses 10W-40, not the 5W-40 the DS900X takes. Don't substitute leftover DS900X 5W-40; the KEL800 is specified for the thicker grade, which also suits warmer climates.

What you need

• 2.6 or 2.8 L of fresh 10W-40 oil (2.8 L if replacing the secondary filter, which you should; a 4 L jug covers it with leftover for top-ups)
• New secondary oil filter (M20 cartridge, Voge original part)
• New seal ring for the drain plug (Voge specifies replacement at every change)
• 22 mm or 24 mm socket for the drain plug (depends on production batch; check yours before the job)
• Cap-shaped wrench for the secondary oil filter
• Torque wrench (10-25 N.m range)
• Drain pan (4 L+ capacity)
• Funnel, rags, gloves
• Oil disposal container

Procedure

1. Warm the engine

Start the bike and let it run for 3-5 minutes to warm up.

2. Park upright, prepare

Park on level ground with the bike on its centre stand (technique guide). The KEL800 oil dipstick can give wrong readings if the bike is leaning, so the procedure assumes upright orientation throughout.

Place the drain pan under the engine.

Loosen the oil cap and let it rest in its place.

3. Drain the oil

Locate the seal plug (M24, on the underside of the oil bottom case). Loosen with a 22 mm or 24 mm socket and let the oil drain into the pan. The plug uses a sealing ring that Voge specifies replacing at every change; order a fresh one and keep the old as a backup.

Wait until the flow has slowed to drips.

4. Replace the secondary oil filter

You should be doing this at every oil change. While the oil is still draining:

• Locate the secondary oil filter on the engine (a small spin-on cartridge, M20 thread).
• Use a cap-shaped oil filter wrench to remove the old filter. It will hold a small amount of oil.
• Inspect the filter mounting surface on the engine. Wipe clean with a lint-free rag.
• Take the new filter and coat the rubber o-ring with fresh engine oil. Also coat the threaded portion lightly. This prevents the o-ring from twisting or pinching during installation.
• Hand-thread the new filter onto the engine until the o-ring contacts the engine surface. The owner’s manual specifies a tightening torque of 11 N.m on page 101, while the engine workshop manual specifies 12 N.m on page 23. We cannot verify which value is correct; see the manual links above.

If you don't have a torque wrench, the manufacturer rule of thumb after o-ring contact is "3/4 turn by hand", but a torque wrench is strongly preferred.

5. Reinstall drain plug

Fit a new sealing ring on the drain plug, then torque to 22 N.m.

Don't over-torque. The drain plug threads into aluminium, and stripping the threads on the bottom case is an annoying repair (helicoil or thread-sert).

6. Refill

Pour fresh oil into the filler hole using a funnel:

• 2.6 L if you didn't change the secondary filter
• 2.8 L if you replaced the secondary filter

Pour slowly; the crankcase galleries take a moment to fill. Don't check the dipstick until after the settle procedure below.

7. Check oil level

Voge's procedure for an accurate dipstick reading on a fresh fill:

1. Put the bike on horizontal ground and open the centre stand.
2. Start the engine and idle until the cooling fan begins working, then idle for 1 more minute.
3. Stop the engine and wait 1 minute for oil to return.
4. Clean around the oil filling port.
5. Remove the dipstick, wipe it, insert it and turn it by 1 full round, then remove it and read the level.

The oil level should be between the MIN and MAX marks, ideally near the middle. If below MIN, top up with small increments (50-100 ml) and recheck.

This procedure follows the owner manual (physical PDF p97). The engine manual (physical PDF p22) instead specifies a 3-5 minute idle, a 2-3 minute wait and insertion without fastening.

8. Verify no leaks

Run the engine for 2-3 minutes. Stop. Visually inspect the drain plug and secondary filter for weeping. There must be no oil leakage.

If anything is leaking, address before riding.

Common pitfalls

• Reusing the seal ring. It compresses on first installation, so reusing means slow weeping that worsens over time. Keep a small bag of M24 sealing rings on hand.
• Over-torquing the drain plug. The crankcase is aluminium. Use a click-type torque wrench and stop at 22 N.m.
• Reading the dipstick wrong. Follow the selected owner-manual procedure: keep the bike on horizontal ground with the centre stand open, then insert the cleaned dipstick and turn it by one full round before removing it to read.
• Skipping the secondary filter replacement. The workshop manual specifies replacement at every oil change; the filter catches the metallic debris from normal engine wear.

Service interval reminder

Per the DS800X Rally periodic-maintenance table (also mirrored in the workshop manual):

• First service: 1,000 km
• Subsequent intervals: 10,000 km, 20,000 km, 30,000 km and onward, or every 12 months

Engine oil and the secondary oil filter are listed as R (replace) at every interval. This applies even to low-mileage bikes: oil oxidises over time, so a year-old sample shows degraded additives even at 1,500 km.

Cross-reference

The KEL800 is a different engine from the DS900X's KEL895. Don't substitute specs:

The KEL800 has a simpler single-drain procedure. The KEL895 in the DS900X has a two-stage drain (bottom case + separate oil tray) that this engine doesn't share.

Sources

• Voge DS800X Rally Engine Service Manual (English). Pages 22-23 cover the oil change and secondary filter procedures and specifications.
• Voge DS800X Rally Owner's Manual. The English table uses different mileage milestones; this guide follows the selected Swedish 10,000 km routine cadence.
• DS800X Rally torque specifications. Full torque table for cross-reference.

Have shop notes that improve the procedure? Send them in.