IMO with new oils formals that a bit much unless the engine on it’s last legs and need to get every mile out of it. Twice year or minimum once year if not driven much IMO. My car changes around year mark cause or sets most of time in garage.

You didn’t mention mileage? Three times in 6 years only once every two years average. When it was newer get away with that, but if you plan on keeping it IMO every 2 years to long as engine ages it cokes up more when oil left in longer. Most people don’t keep vehicles pass 3 or 4 years so they never experience engine oil related problems. It’s the second owner that discovers oil related problems from lack of changes. That’s why most want see service records on used car.

Plenty of utube videos on oil change intervals. Most recommend 5K or one year which ever comes first. If you drive over road majority to time long steady speed trips can go longer cause that don’t have same effect on oil as stop and go short trip driving.

They are changing the oil every two years and probably more than 6,000 miles. This is beyond what the manufacturer probably recommends. Yes, they should be changing it more frequently. Annually should be fine, instead of every two years, as it appears they aren't putting a lot of miles on the car.

Wow! lots of great opinions here. . .

I have always changed my synthetic oil every 5K miles, and never had a problem. Always other parts of the car failed before the engine failed. I have never had a major engine failure since I started owning cars in 1980, with regular oil maintenance. With a low mileage use vehicle, a change every 6 months should keep the engine working well, as well as a brake check as high humidity / rain can cause rust on the rotors and increase brake wear and stopping distances. . .

A quick tip about checking oil using a dip stick:
pull the dipstick with a cold engine in the morning after sitting all night. The oil will have drained down into the pan, and the cool/cold nature of the oil will give an easier read on the dip stick as the oil is thicker and easier to see.

Regular maintenance on a large cost item will keep the large cost item from becoming future junk later rather than sooner, as all vehicles are future junk.

What? you still driving flat head ford?

You can’t use straight 30W oil in variable valve timing vehicles. Passages are too small some chain tensioners and other components use oil pressure to operate, then there heat factor that will slug/gum up 30W oil quicker. Most news vehicles use 0-15w oil now.

Especially with newer direct injection turbo's, need to stick with Mfg recomendations - including the alphabet soup list of letters behind the oil type.

I change my oil ( Mobile 1 ) once a year, but I only get about 4 k miles living in the bubble.

a healthy engine does mot "burn" oil