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Appreciate the comments. I've now switched to full synthetic oil. Great information overall on this board so thank you.

Originally Posted By: BrocLuno Originally Posted By: dporter177 Thanks guys. Perhaps I was overly concerned about going 15 months and 7k miles on non synthetic oil. Really appreciate the comments. No problem. Big Rigs go 20,000 miles on conventional oil. You did not get anywhere near the end...

Originally Posted By: SilverSnake First, I would engage in an hour of intense self flagellation to punish yourself for severe malignant neglect of your machinery. I liken this to not feeding your horse for a week. Next, I would trade in or sell your vehicle as soon as possible. Buy a new one and...

Originally Posted By: HoosierJeeper Don't worry. Land Rover actually specs my LR3 for 7500 mile OCIs running plain 5w30 dino. 155k on it and it doesn't use enough oil to warrant topping off. I run it 6k usually, but I've hit 7500 a few times if it's really cold or hot out. Wow. And it's ok for...

Originally Posted By: SR5 Originally Posted By: dporter177 I own a 2010 Highlander, 4WD with a V6 engine..... (I don't drive my car much and when I do it's mostly highway). I went 15 months and 7k miles without an oil change. This was using a synthetic blend oil (Pennzoil Gold I believe)...

Thanks guys. Perhaps I was overly concerned about going 15 months and 7k miles on non synthetic oil. Really appreciate the comments.

Originally Posted By: CT8 Originally Posted By: dporter177 Originally Posted By: ARCOgraphite Why would there be damage? User manual says 5k miles or 6 months for the OCI. Was worried since I waited 15 months and 7k miles while NOT using synthetic oil. You should have worried before the fact...

Originally Posted By: oil_film_movies I like the Fram Ultra recomendation, do that. Its far more important to keep the oil level between add and full than what happened here (long OCI). Hope you checked it once a month or so. Still, its a bit long, and your pistons got too black, but not...

Originally Posted By: E150GT I just changed oil on my friends explorer. It had been over a year and probably close to a year and a half and that truck did not sit. The oil and filter was filthy but was fine. No sludge or anything. I just made him buy a fram ultra filter to put on there and I...

Originally Posted By: ARCOgraphite Why would there be damage? User manual says 5k miles or 6 months for the OCI. Was worried since I waited 15 months and 7k miles while NOT using synthetic oil.

All good points. Unfortunately I have already changed the oil since this happened so I can't do a UOA. Guess I was just worried about issues down the road with the engine. I know TiresPlus said they used synthetic blend, but this was their "standard oil change" for awhile, so I'm guessing it's...

I own a 2010 Highlander, 4WD with a V6 engine. I was going back through paper work on my oil changes and it appears I missed an oil change between 44k miles and 51k miles. That time span was 15 months (I don't drive my car much and when I do it's mostly highway). I've never missed any other oil...