quote:Now this isn't my opinion, just the opinion of someone else. We were having a debate about the pros and cons of switching to synthetic after using dino for high mileage engines. I have switched over several vehicles with high miles and never had a problem, as they were well maintained to begin with. Does this post make any sense, apart from the usual cautions when switching in a motor with an unknown history?
Actually, I have to back him up on this......I agree it isn't wise to switch to synth from dino in high mileage engines. Leaks may have been the problem in his case, but the change in the car from dino to synth after all those miles puts shock into the vette and effects alot of areas that were once fine. Those areas that were heavily worn like places of deposit and build-up in the pan become holes now and thus leaks begin. Sure you could change to synth after all those miles and your car would eventually perform better under certain conditions(Depending on what you have and/or have not used with dino), but the shock could damage an engine like that in other ways. Fact is...Mobil 1 is definitely superior for our vettes than dino. But it should only be used in new engines or right from the get-go unless you feel like gambling with your engine. (They don't exactly grow on trees btw). I plan on replacing and/or upgrading my engine pretty soon here(It just reached 130k, but still runs very strong) and since I got it, I've been running it on dino because I had word that the previous owner was using it. Otherwise I'd have gone synth. However, I have been using other micro-lubricants habitually with the dino which is probably why it performs like or better than most vettes I've seen with Mobil 1. Mobil 1 is better than dino like I said , but it doesn't necessarily mean the vette isn't going to run as well unless all the other individual is using is dino with no other help. There are other ways...safer ways for people who still use dino to reach engine performance and/or exceed that gained with mobil 1 without risking your engine by a high mileage switch to synth. It just isn't worth it. I can tell you though, once I break in the new engine...it's gonna be a mobil 1 buffet, though I'm still gonna use my other micro-lubricant. BTW, my oil changes are frequently and habitually done at every 3k.