The first engine has its valve cover off, and the cams, rockers and springs underneath are a clean golden tan, the metal still visible everywhere. A bare hand points across the rocker shafts while the text on screen sets “3k mile oil changes” against oil changes every 10,000 to 20,000 miles. Then the video cuts to a second engine, and the same parts are coated in black, tar like sludge.

The 23 second reel was posted by @theothermechanic with the caption “You Need to do oil Changes people.” It has no spoken explanation to read, only those two lines of text and the close shots of both engines.

On the second engine, the dark deposits sit thick around the camshaft lobes and pile up in clumps at one end of the head. The camera moves down to an opening at the end of the cylinder head, and his finger presses into the gummy black buildup around it, coming away with it. At that moment the second line of text appears: “This crv only had 80k on it…”

The last shots pull back to show the whole head of the second engine, the cams in a row and black residue covering nearly every surface between them. The reel does not show the owner’s service records, the oil used or how the CR V was driven. The 3,000 and 10,000 to 20,000 mile figures are the labels he put on the comparison; the video itself does not show the oil change history of either engine.

What Honda and California Say About Intervals

Honda does not set a single mileage number for the CR V. According to Honda Canada’s maintenance schedule page, its Maintenance Minder estimates remaining engine oil life using factors including speed, temperature and the time the engine spends in more severe operating conditions. When the estimated oil life reaches 15 percent, the dashboard shows a Service Due Soon message. Honda also says the system has no sensor for oil level and tells owners to check the level regularly.

The 3,000 mile rule is not a manufacturer requirement for most modern cars. California’s recycling agency, CalRecycle, states that the old standard of 3,000 miles is out of date and no longer applies to most cars, and that many can go 5,000, 7,500, 10,000 or even 15,000 miles between changes. It tells drivers to check the interval in their owner’s manual.

How to Keep Your Engine Looking Like the First One

Find your number in the owner’s manual, not in a video or a shop sticker. If your car has an oil life monitor like Honda’s, service it when the reminder appears instead of resetting it and driving on.

Check the dipstick between changes. Honda says its system has no sensor for oil level and tells owners to check the level regularly.

Keep proof. Save every oil change receipt with the date and mileage. If you buy a used CR V or any other car without those records, ask for the service history before you pay.

Look under the oil filler cap with a flashlight when you check a used car. If what you can see looks like the second engine in this reel, black and crusted rather than clean metal, ask for the service records before you buy.