re: Is synthetic oil a waste?

quote:

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I use it for longer oil change interval purposes.

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This is the correct usage of it, IMO.

If you want to go for longer intervals b/t oil changes, use synthetic. If not, use regular.

I've always used non-synthetic simply b/c I enjoy changing the oil in my car and did it ever 3-4k miles. Was it necessary to change it that often? No. But it's what I did.

The motor lasted great up to 200k miles, when I replaced it w/ a new/bigger engine, but it worked great until the day I swapped it out.