12k vs 3k on oil changes ? Wow, with all due respect to the frequent oil change fanatics, 3K is way out of line IMHO unless you have a real special need. 5k is perfectly fine on non synthetics and 7500 to 10k on synthetics will make your motor last as long as any 2500 oil change interval on older cars. Have you noticed how long motors are lasting ? Regular oil changes and not skipping them is important. Personally, I am using synthetic to 7500 miles on one vehicle and 5k non on the other. After I get over my fetish and feel comfy, I will move to 10k synthetic on the car that “requests” it, never look back and have a motor that will easily out last the body…
I completely disagree about supposed hype of a good synthetic. It’s like “read the owner’s manual on some things and they become wrong when we know better on others ?” Selective reasoning and it’s incorrect IMO.
In cold climates especially it can save a lot of wear over time on start up and stand up to tougher driving conditions that break down regular oil when used for extended intervals. The state vehicles in our state have been on a 10k synthetic diet for manny years and it has saved taxpayers lots of $$$$$$$ in longevity and costs. Motor break downs attributed to wear on these high mileage vehicles, just doesn’t happen according to workers I personally know. No hype, just fact.
@MikeInNH ( no manufacturer has different oil change intervals…) Have you read your own Highlander manual ?
Congratulations my friend…Now you know; Toyota uses different oil change intervals for each and highly recommends that if you have to use regular oil, after 5 k you go back to 10 k synthetics ASAP ! Now, if this were Yugo I might be incline not to trust them. But as YOU know personally, their motors have exc. longevity reputations and they will do nothing to tarnish that reputation.