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Even before joining BITOG, I was getting ready to switch off of synthetics in general and M1 in particular. Why? because when I traded my old vehicle in, nobody cared how good the engine condition was and I believe conventional would have been okay for the mileage I traded in (115k miles). Rest of the car was falling apart or so I wanted to believe.
Engines are outlasting everything else in cars nowadays. Sure engine will go upto 300k miles on synthetic but more than likely, you wont keep it that long. If you do, then fine.. I think realistically, dino changed on time will get you to 200k.
Currently, I have GTX in my crankcase and it seems to "like" it. Running smooth.
I agree but you can get synthetics on sale for about 5% more than dino today. So I stock up on the sale price stuff. But the wifes Toyota is over 100k on valvoline ac and now switched to maxlife which is still $3 cheaper per change and just as good for 5000 OCI's which is what I do. But the synthetics in my truck do give me 2mpg better which makes them the same price basically. But M-1 is way overpriced IMO.