How do engines die?

[coolone]

You mention oil change every month but you don't mention miles. Only in your hypothetical, theoretical scenario do you mention miles.

You need to be more specific as to how much oil is being lost. Then you need to be sure there are no leaks, or are you burning it. Compression test will tell you a lot but isn't an end all. Could be simple as valve seals. And yeah, if you're burning a quart a week (500 mile assumption), then no, you don't ned to change oil every 2000, just the filter, if that. But if your burning that much oil 1qt/500 miles, you aren't going to be using that engine long.

That said, there's no benefit to a rebuild over a JY engine. You need to change standard oil 2000-3000 miles, anything higher is no go. Synthetics especially pure, can go longer intervals before it breaks down. Mobile 1 (Synthetic Blend) is changed every 5000-6000. New filter every time. Only way I'd do a rebuild, machine shop special 3800 is if I were attempting to go where no 3800 went before, lol.

[Vincenzo]

You mention oil change every month but you don't mention miles. Only in your hypothetical, theoretical scenario do you mention miles.

You need to be more specific as to how much oil is being lost. Then you need to be sure there are no leaks, or are you burning it. Compression test will tell you a lot but isn't an end all. Could be simple as valve seals. And yeah, if you're burning a quart a week (500 mile assumption), then no, you don't ned to change oil every 2000, just the filter, if that. But if your burning that much oil 1qt/500 miles, you aren't going to be using that engine long.

That said, there's no benefit to a rebuild over a JY engine. You need to change standard oil 2000-3000 miles, anything higher is no go. Synthetics especially pure, can go longer intervals before it breaks down. Mobile 1 (Synthetic Blend) is changed every 5000-6000. New filter every time. Only way I'd do a rebuild, machine shop special 3800 is if I were attempting to go where no 3800 went before, lol.

I'm sorry about the confusion, I put around 50 miles/day or 1500-1800/month.

And, for the oil I'm loosing, it's about 1qt/month (or you can say per 2000 miles and much better than the 500 you mentioned).
BTW, do you have any idea about the cost of a compression test or valve seals replaced? just a rough number.
You mentioned something kind of weird in your second paragraph, i.e., changing filter without changing oil!!
I use GTX full synthetic high-milage oil and the highest end thing walmart has for filters, so I do the changes at more than 3000 miles intervals (typically 4000-6000).

I'll take your advice in not rebuilding in the future (about a 100 years or the obsolescence of my kind, whichever comes first, lol), but putting a remanufactured one with a long warranty.