Not sure if I’m seeking fact or opinion.
I own a car that gets driven maybe once or twice a week. Over the past 12 months the odometer has advanced just shy of 2,000 miles.
I’m thinking I should change the oil every 6 months.
Agree? Disagree?
mmm
When you drive it, does it get up to operating temperature, and stay there for 15 minutes or more?
Yeah. For an internal combustion engine, this is – IMHO – the actual key to maximizing longevity in infrequently driven vehicles.
ETA: @DavidNRockies snuck in while I was typing. Didn’t mean to write a pile-on.
'Zactly. @beowulff nailed it.
If you’re up to operating temp for long enough to boil off any condensed water the oil has a nearly infinite calendar life and just depends on mileage. If.
And where do you live? A high humidity environment is worse than a desert. An area with large diurnal (day/night) temperature swings is worse than one with a fairly flat 24 hour temp curve.
At 2x/week = 100 drives/year, you’re putting average 20 miles per drive on it. If that’s 10 miles out, a complete cooldown, then hours later driving 10 miles back you’re probably marginal on boiling off all the water. Unless you’re in a desert to begin with.
OTOH, a 20-mile 40-minute round-trip run at 30mph average across suburbia on boulevards would more than clear the water.
Is it Synthetic or normal oil?
If synthetic with that mileage, a full year between is plenty.
Synthetic oil, live in the midwest, and a typical drive is perhaps 20 miles (then park for a few hours and 20 miles back).
mmm
I’d probably change it once a year, even if it’s only 2K miles. Perhaps it’s irrational, but I just don’t like extending oil change intervals past a year. It’s cheap insurance.
But it’s good you’re driving it 20 miles. The worse thing on oil is frequent, cold startups and short trips. On a cold startup, gasoline tends to condense onto the cylinder walls, and run down into the oil. And if the oil isn’t brought up to temperature, the gasoline just stays in the oil.
You are almost perfectly describing my car (2007 Toyota RAV4) and my driving habits. I have only 42K on the car and drive it infrequently, but regularly. Typically, I’ll drive it 30 miles (one-way) to have lunch with a friend and then not drive it again for a week. I’ve been changing the oil every year, which works out to about 2K miles per change. The oil looks great and I’ve had no problems with water or abnormal contaminants.
I’m quite confident the car will outlast me. It has very few options, FWD only, and the bulletproof 2.4L 4-cylinder engine. My main concern has been rubber and plastic parts, so I’ve changed the tires, belts, and hoses even though they did not look worn.
My 2010 Honda Fit has an oil use indicator on the dashboard that tells me whether the oil is at 100% (just changed) or less than that. By the time it gets to 15%, I get another prompt to get the oil changed. So it’s not at all a matter of number of miles driven or time elapsed since the last oil change. Do other cars have such a feature?
That’s great to know, thanks!
Mine is an equally well-build Mazda (though a 2023 model).
I have never encountered or heard of that.
mmm
I’m in about the same situation as the OP, driving-wise. I work from home, so I only drive my vehicle once or twice a week. I just bought it new at the end of July 2025, so I’m coming up on a year of ownership and I just realized the other day that I haven’t had my oil changed yet. I’m probably over 4,000 miles since I took it on a couple road trips.
My previous vehicle was a 2012 Jeep Grand Cherokee, and I just waited until a message popped up on the dashboard telling me I needed an oil change, but I used to drive it more often. I should probably get an oil change soon, nanny dash message or no.
The equivalent on my 2007 GMC. I used it during the first 5 years when I drove a lot for work. The oil change interval varied between a low of 4936 miles and a high of 12848. After retiring in 2012 with a significant reduction in mileage I started changing it every 2 years regardless of what it said.
My 2016 Mazda has just over 20K miles on it. I used to get an oil change every year, but have only done it once since moving to MSP three years ago. It gets very little use, as our grocery store and bank are within a few blocks of us and a tank of gas lasts a very long time. I probably ought to get it done again.
You’re in a cold climate IIRC? 3 years is a long time for even synthetic oil if you get real winters. Garage kept or outside?
I would get the oil changed either way, but if you go through cold winters outside, a year is probably about max. If garage kept or no winters, you can probably safely get away with 2 years. 3 is really pushing it.
I would be uneasy going more than a year. Heck, waiting even a year gives me pause, but I’m the type who fills the gas tank up when the needle hits the halfway mark.
FWIW my Mazda is garage kept.
mmm
My 2017 Honda Civic (and I think the 2007 Accord before that) had an oil change warning. You could check it anytime and see how long it was before you need the next one in units of percent. You’d get the warning at 15%.
I’m not sure if they measured something like viscosity or it was based on mileage because it was always about the same number of miles between changes.
Yeah, we get cold winters and scorching summers. The car is garaged in a heated space. I got the oil changed a couple of years ago because we had just driven across the country to move here, but have been lax about it since. Had my battery replaced last year because it died. I’ve been lazy about the oil change because it’s a long wait at the garage, with no nearby coffee shops to goof off in. And I don’t trust Jiffy Lube and similar places.
Jiffy Lube does suck, I used them twice and had bad experiences both times. I don’t trust Pep Boys either.
We have a chain called Mr Goodlube 10 Minute Oil Change, I’ve used 3 locations over the last 25 years and all to good results. Probably none in your area.
Maybe ask your neighbors for a recommendation.
The owner’s manual for my 2010 Honda Fit says of the engine oil life indicator, “Based on the engine operating conditions and accumulated engine revolutions, the onboard computer in your vehicle calculates the remaining engine oil life and displays it as a percentage.”
I have no idea why your car always indicated changes at the same number of miles. Perhaps your driving is just that consistent?
Oil changes are cheap. Engine rebuilds somewhat less so.