Foretravel Owners' Forum

I was just reading the oil should be changed every 6 months? The previous owner serviced engine and changed the oil once a year. Wanted to see what everyone else does?

Based on time (vs miles) I agree, once a year is fine.

Yes, if you do a lot of idling (not recommended), more frequently.

Given the costs associated with the oil and fluid changes, I have started sending oil samples to Blackstone Labs to be tested when I think I'm getting close to a change time.  Their reports and summary give good info.

I'm happy to know that my trans fluid, supposed to be good for 150k, and currently has 25k on it, is good to go.  As I figured, the 2+ year old and 12k mile oil was ready to be changed.

Thank you! I just had the transmission serviced with Transynd, so that will be good for a while. I was thinking once a year on filters and oil.

I am going with 1 year or 6,000 mi. which ever comes first.

Once a year on mine, usually 4-8k miles

Can go at least 20K on Amsoil,change filters at half way point,around 10K.

2 years but I need to do an oil sample. I only drove it 1000 miles last year with fresh oil

With a bypass filter and synthetic oil, I replace the engine oil, engine oil filter, and bypass filter every five years (circa 25,000 miles). The practice of disposing of ten gallons of oil every year does not feel "green" to me.
In my opinion, the most important modification for extended oil change interval is a By-pass Filter. I installed the AMSoil By-pass Filter in 2011 which keeps the oil free of wear particles large enough to score bearings for up to 75,000 miles. I plumbed the return line from the bypass filter into the fitting on the top of the engine valve cover. I support this extended oil change interval with the annual oil analysis done from 2012 to 2016. My 1996 Cummins M11 has 140,000 miles now. At 125,000 miles Northwest Cummins in Medford, Oregon, adjusted the valves and the Head Mechanic said that was the cleanest engine he had ever seem ( after 25,000 miles with a bypass filter).

Nothing about your coach is green.. Especially the oil but if it does help the "oil" came from the ground like most the materials its built with .:)

Once a. year for me.

 1yr. or 6k miles oil change, slip under hit the grease fittings 2 times per year along with taking the weight off front end yearly for greasing Kingpins.

Automotive, Recreational Vehicle and Bus B Series Engines 5.9L
Every 10,000 Kilometers [6000 Miles], 250 Hours, or 3 Months1, 4 Section 4
• Lubricating Oil - Change1
• Lubricating Oil Filters - Replace
• Air Cleaner Restriction - Maintenance Check
• Air Intake Piping - Maintenance Check
• Charge-Air Cooler - Inspect4
• Air Compressor - Maintenance Check
• Batteries - Inspect

ISC, ISCe, and ISL Engines
With CM554 and CAPS Fuel System
Every 29,000 km [18,000 mi], 500 Hours, or 6 Months - Maintenance Check Section 8 Every 29,000 km [18,000 mi], 500 Hours, or 6 Months - Maintenance Check Section 8
• Fuel Filter - replace
• Supplemental Coolant Additive (SCA) and Antifreeze Concentration (2) - check
• Coolant Filter - replace
• Lubricating Oil and Filter (1) - replace
• Batteries (4) - check
• Battery cables and connections (4) - check

ISC, ISCe, and ISL Engines
With CM850 and Cummins Common Rail Fuel System
ISL CM2250 Engines Maintenance Checks
Perform maintenance at whichever interval occurs first.
Maintenance Procedures at 32,000 Kilometers [20,000 Miles], 500 Hours, or 6 Months (Section7)
• Fuel Filter (Spin-On Type) - Change7
• Lubricating Oil System - Drain1
• Lubricating Oil Filter (Spin-On) - Change1


ISM and ISMe
Every 24,000 km [15,000 mi], 300 Hours, or 6 Months (1), (3)
Section 4
• Fuel Filter (Spin-on) - change (1)
• Lubricating Oil and Filters - change
• Lubricating Oil Filter (Spin-on) - change
• Coolant Filter - change
• Supplemental Coolant Additive (SCA) and Antifreeze Concentration - check
• Charge-Air Cooler - check
(2)
Ref https://www.lexissecuritiesmosaic.com/gateway/FedReg/parts_Recommended_Maintenance_Schedule.pdf

Signature and ISX
Every 40,000 km [25,000 mi], 800 Hours, or 6 Months (1) (3)
Section 5
• Fuel Filter (Spin-On Type) - change
• Lubricating Oil and Filters - change

Not to stir the pot. But with improved oil additives in the past 20+ years, and improved filters, just can't justify changing low mileage oil every 6 mos. Check out the new oil change intervals on the Cummins ISX.
As always DWMYFG is your money.