If you own or operate a Bobcat S650, changing the engine oil and filter is one of the simplest ways to prevent expensive downtime. Oil service is not complicated, but it does need to be done correctly. Low oil, dirty and contaminated oil, the wrong oil, or an old filter can shorten engine life and turn a routine maintenance job into a repair bill.
For the Bobcat S650, the service schedule calls for engine oil and filter replacement at the first 50 hours, then the service schedule either every 100 hours under severe operating conditions, or every 500 hours or 12 months under regular scheduled maintenance. If your machine works in dust, mud, cold starts, heavy attachment use, or long idle periods, treat it like a severe-duty machine.
Get the Right Oil Filter and Lube for your Bobcat S650
Chinook Equipment has the the correct Bobcat S650 oil filters, engine oils, and full service kits to keep you and your Bobcat working. Contact Chinook Equipment with your machine serial number and current hours so we can match the right parts the first time.
Bobcat S650 Engine Oil Capacity
The Bobcat S650 engine oil and filter change capacity is 11.4 L. Do not pour in the full amount without checking. Add oil carefully, check the dipstick, run the engine briefly, inspect for leaks, shut the engine off, wait a few minutes, and recheck the oil level.
Overfilling is not harmless. Too much oil can cause foaming, leaks, crankcase pressure issues, and possible engine damage. Underfilling is worse. The dipstick is the final check.
Difficulty, Time & Tools
Difficulty: Beginner to intermediate
Estimated time: 45–90 minutes
Best for: Routine scheduled maintenance
Tools/supplies needed: Drain pan, filter wrench, hand tools, clean rags, gloves, eye protection, correct engine oil, correct Bobcat oil filter
If you are already servicing the oil, ask Chinook Equipment whether your fuel filter, air filters, hydraulic charge filter, breather cap, or grease points are due at the same machine hours.
Before You Start
Park the loader on level ground. Lower the lift arms. Place the attachment flat on the ground. Stop the engine, remove the key, and allow hot components to cool. Clean around the oil fill, dipstick, filter base, and drain area before opening anything.
Do not service the machine with the engine running unless the official procedure specifically requires it. Keep clothing, tools, hands, and jewelry away from moving parts and hot components. Clean up spilled oil immediately.
Step-by-Step Bobcat S650 Oil Change
- Warm the engine
Run the machine long enough to warm the engine oil, then shut it off. Warm oil drains more completely and carries more contamination out with it.
- Access the drain hose
Open the rear service area and locate the engine oil drain hose. Route the hose into a drain pan large enough to hold more than 12L.
- Drain the oil
Remove the drain cap and allow the engine oil to drain fully. Do not rush this step. Once the oil has drained, reinstall and tighten the drain cap, then return the drain hose to its proper storage position.
- Remove the old oil filter
Use a filter wrench if needed. Check that the old gasket comes off with the old filter. A doubled gasket can cause a major leak after startup.
- Install the new filter
Clean the filter base. Apply clean oil to the new filter gasket. Install the filter by hand. Do not cross-thread it. Do not crush it with a wrench.
Need a genuine Bobcat S650 oil filter?
- Refill the engine
Add the correct engine oil through the fill opening. Start with slightly less than full capacity, then check the dipstick and bring the level up carefully.
- Start, inspect, and recheck
Start the engine and let it run briefly. Shut it off and inspect around the filter and drain cap for leaks. Wait a few minutes, then recheck the dipstick and top up if needed.
Common Problems After an Oil Change
| Symptom | Possible Cause | Next Step |
| Oil leak at filter | Loose filter, doubled gasket, dirty sealing surface | Shut down and correct immediately |
| Oil pressure warning | Low oil, wrong filter, oil system issue | Shut down immediately and inspect |
| Oil level too high | Overfilled crankcase | Drain excess oil and recheck |
| Milky oil | Possible coolant contamination | Stop running and book service |
| Fuel smell in oil | Possible fuel dilution | Stop running and book service |
When This Is Not a DIY Job
Do not keep running the S650 if you see an oil pressure warning, repeated oil leaks, milky oil, fuel-contaminated oil, metallic debris in oil, or an engine noise that appeared after service. At that point, the risk has moved beyond routine maintenance.
If your Bobcat S650 has an oil warning, leak, contamination concern, or unknown service history, book service with Chinook Equipment. A proper inspection is cheaper than running the engine until it fails.
Parts Needed and other maintanence items
- Bobcat S650 engine oil filter – Genuine Bobcat oil filter – 6678233
- Correct engine oil
- Fuel filter, if due – Genuine Bobcat fuel filter – 6667352
- Air filter elements, if dirty or due – Inner Air Cleaner Filter
- Genuine Bobcat Inner Air Cleaner Filter – 7008044
- Genuine Bobcat Outer Air Cleaner Filter – 7008043
- Hydraulic charge filter, if due
- Hydraulic reservoir breather cap, if due
- Grease
- Full maintenance kit
Send Chinook Equipment your Bobcat S650 model, serial number, current hours, and what service you are doing. We can help build the correct parts list before you start.
FAQ
How much oil does a Bobcat S650 take with filter?
The Bobcat S650 takes 11.4L for an engine oil and filter change.
How often should I change oil in a Bobcat S650?
The schedule calls for first service at 50 hours, every 100 hours under severe conditions, and every 500 hours or 12 months under normal scheduled maintenance.
Can I use any diesel engine oil on my Bobcat S650?
No. Use oil that meets the correct specification and temperature requirements for the machine and operating conditions.
Should I change the oil filter every time?
Yes. Changing oil but leaving the old filter in place is poor maintenance.
What should I do if the oil light comes on after service?
Shut the machine down immediately. Check oil level, filter installation, and leaks. If the warning remains, book service.
What type of Oil should I use in my Bobcat S650?
Refer to your service manual or contact chinook equipment for specific recommendations, typically the S650 will use conventional Bobcat 10W30, 15W40, or synthetic 5W40 depending on operating conditions.
Chinook Equipment is your official Bobcat Parts and Service store
When it’s time for you to take care of your Bobcat S650 oil, maintenance, and other service parts or if you want the service handled by our expert Bobcat trained technicians reach out to Chinook Equipment Western Canada’s Bobcat Expert.