BMW R 1100 GS Maintenance Schedule and Service Intervals

This is the maintenance schedule and service intervals for the BMW R 1100 GS, from the manual plus service manual and other parts diagrams / notes.

The BMW R 1100 GS is a motorcycle in the iconic GS line of the “oilhead” days of BMW motorcycle engines. The R 1100 GS was the first GS bike to use an oil-cooled engine, rather than purely air-cooled engines as BMW had been using for many decades before.

The R 1100 GS is powered by a 1085 cc fuel-injected boxer twin with four valves per cylinder. It runs a 10.3:1 compression ratio and makes a modest (by today’s adventure bike standards) 80 hp / 60 kW at 6750 rpm, with peak torque of 97 Nm / 72 lbf-ft at 5250 rpm.

Like the other GS bikes, the R 1100 GS has a shaft final drive, which is more convenient than a chain for riding on dusty roads (no chain to clean!)

In 1999, the BMW R 1150 GS replaced the R 1100 GS with an upgraded motor and some improved specs.

Here are all the big BMW GS models for which we have maintenance schedules

BMW R 1100 GS 75 Years LHS studio — BMW R 1100 GS 75

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BMW R 1100 GS Service Intervals

Overall, the BMW R 1100 GS has 6000 mile / 10000 km service intervals. At every service, change the oil and filter, plus change the drivetrain oil, and give the motorcycle a once-over.

You also need to check the valve clearances every service.

The BMW R 1100 GS has a shaft final drive, which is lower maintenance than a chain, but you do need to change the oil at every service as well.

Note that the maintenance guidelines for the R 1100 GS are a bit outdated in a number of ways, which we’ll note below.

Oils, Spark Plugs, and Other Consumables for the BMW R 1100 GS

Item	BMW R 1100 GS spec
Engine oil	BMW recommends BMW Advantec Pro 5W-40 engine oil. But many BMW old hands use any old car oil of various weights, 20W-50 motor oil being a common choice. You can get into endless discussions on the subject, if that’s your poison of choice!
Oil filter	Use a BMW Mahle oil filter, or a Hiflofiltro HF163 oil filter.
Air filter	A K&N BM-0400 is easy to find and plugs in.
Spark plugs	The 1150 motor in the GS is single-spark. You need NGK BKR7EKC (14mm thread).
Final drive oil and gearbox oil	For the final drive, a commonly recommended and easy-to-get choice is Castrol 75W-90 oil, but others work too.
Brake fluid	Use BMW DOT 4. The R 1150 GS has a cable clutch.
Coolant	…Just kidding!
Cable lube	Use Protect All Cable Life for a good universal cable lubricant.

BMW R 1100 GS consumables for a basic service

BMW R 1100 GS Maintenance Schedule

Below is the full maintenance schedule for the BMW R 1100 GS. It comes in the form of individual checklists for different mileage / timing points, but it’s more convenient to see them in one schedule.

We split the schedule of items to perform into a schedule of major items, plus a general inspection checklist to perform periodically.

Major service items

Notes (We’ve incorporated these into the service schedule).

Brake fluid — Most modern motorcycles only recommend changing the brake fluid every two years, with no distance interval. The R 1100 GS’s recommendation to change this more often (ever year, and with a distance interval) is quite aggressive.
Final drive oil and Gearbox Oil — Modern motorcycle manuals recommend changing these items every two years if you don’t do the specified distance.
Alternator belt — Modern BMW motorcycle manuals recommend changing the belt every five years.

mi x 1000	6	12	18	24
km x 1000	10	20	30	40	Notes
Inspection checklist (see below) — Perform Not all items are required annually — See below	✓	✓	✓	✓	Year
Engine oil — Change when engine at operating temperature. (BMW Advantec Pro 5W-40)	✓	✓	✓	✓	Year
Oil filter — Change (HF163)	✓	✓	✓	✓
Gearbox oil — Change (Castrol 75W-90)	✓	✓	✓	✓	2 years*
Final drive oil — Change (Castrol 75W-90)	✓	✓	✓	✓	2 years*
Valve clearances — Inspect / Adjust	✓	✓	✓	✓
Spark plugs — Check condition / gap	✓		✓
Spark plugs — Replace (BKR7EKC)		✓		✓
Air filter — Replace (BM-0400)		✓		✓
Brake fluid (front and rear) — Change (BMW DOT 4)	✓	✓	✓	✓	2 years*
Check wheel bearings		✓		✓
Fuel filter — Replace				✓
Alternator belt (Poly V belt) — Replace				✓	5 years*

BMW R 1100 GS Service Schedule

Inspection checklist

Below is the general inspection checklist. Do these items per the schedule above.

The manual only specifies certain items have to be done as part of the annual check. But the rest of them aren’t hard to do anyway.

BMW R 1100 GS Inspection Checklist	Annual check
Battery acid level — Check	Yes
Battery terminals — Clean and grease	Yes
Poly-V belt (alternator belt) — Check / adjust tension
Throttle cables — Check freedom of movement, and for kinks and chafing
Clutch play — Check
Front and rear brake pads — Check for wear
Front and rear brake discs — Check for wear
Front and rear brake fluid — Check level
Brake piles, hoses, and connections — Visually inspect for wear
Swinging arm bearing — Check free movement
Side stand — Lubricate	Yes
Clutch cable — Lubricate	Yes
Side-stand switch — Check operation	Yes
Idle speed — Check	Yes
Throttle body synchronisation — Check	Yes
Throttle valves — Check	Yes
Spoke tension — Check	Yes
Tire pressures and tread depth — Check	Yes
Lights and signalling equipment — Check	Yes
Test ride as final inspection and function check	Yes
Confirm BMW Service in on-board documentation	Yes

BMW R 1100 GS Inspection Checklist

About the BMW R 1100 GS

The BMW R – GS line almost needs no introduction. It has been world-famous for a very long time, and kept BMW on the map as leaders in enduro motorcycle production.

The BMW R 1100 GS is an early version of the GS line. It’s well before liquid cooling, and is in fact the first of the BMW GS line to have an oil-cooled engine; a so-called “oilhead”, as opposed to the “airheads” that came before it.

But most other things about the R 1100 GS are very familiar, including the fact that it’s a boxer motor powering a shaft drive.

BMW built the R 1100 GS between 1994 and 1999. Before it came the BMW R 100 GS, an air-cooled carburettor-fuelled adventure bike that’s definitely one for the history books. The R 1100 GS didn’t just improve on the engine, though — it added the “Telelever” front suspension, which uses geometric trickery to counter the effect of diving when braking. Clever! BMW still uses it today in their top-spec bikes.

That’s not even all — on the R 1100 GS, ABS was an option. It’s pretty incredible that a bike from so long ago could come with ABS. Many newer ones don’t. Heated grips was another less surprising but more commonly chosen option.

As an aging bike, the BMW R 1100 GS has tons of character to it. The engine is more vibey than modern, liquid-cooled boxer engines, but has a tractor like rumble that some may not like (BMW boxers are sometimes called “agricultural”) but that won’t quit, anyway. The bike looks striking, and never fails to draw a crowd.

Compared to modern adventure motorcycles, the BMW R 1100 GS may seem unimpressive on paper. It peaks in power very early, making on 60 kW (80 hp) before having to be shifted. That’s not so bad in itself, but this is a heavy bike, weighing around 245 kg / 540 lb, and that’s before you start adding on all the extras like luggage, crash protection, plus a rider and all the kit. So riding the R 1100 GS means short shifting it and enjoying low-down torque, rather than blasting it through the rev range.

The one thing the R 1100 GS has going for it is a track record of longevity. Apart from a willingness to burn oil (experiences vary, but it can happen with any old engine), the 1100 oilhead motor and drivetrain goes for a LONG time. There are abundant used examples with over 100000 miles or even 200000 km on them, still seemingly in great condition. Try finding a sport bike with that mileage on it!

That said, if you do look at an old one, there are things to look at other than the maintenance schedule: the condition of the bearings, the moving parts, and the clutch, which does require you to split the motorcycle in two to check it. But if you’re going for a long trip, it’ll be worth your while!

The BMW R 1100 GS was replaced with the R 1150 GS, the “adventure” spec of which was featured in the iconic film Long Way Round.

Reference — Service Manual for the BMW R 1100 GS

The above information came from the service DVD for BMW motorcycles, which has PDFs of the maintenance schedules. We also consulted other online resources for parts specs and recommendations, including ADVrider and BMW forums.

See screenshots below of the 10K / annual and 20K schedules.