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Only asking because my old engine leaked a lot more oil when I put synthetic in it the one time I did.

Have you seen any noticeable increase in leaking using the synthetic?

If you buy your oil from Walmart, DO NOT buy the house brand ( Supertech) it is garbage. Only suitable for burning as a fuel additive.

Lucas is one additive I never opt out of using. I use it religiously.

As I stated, the shell is good motor oil, I like it. There probably is something better out there. Seems the O.p. has forgotten about this thread so I'm just going to try the spirax myself. Doubt it's any better than most others.

Well, shell oil is great oil, and the spirax says that it's yellow metal safe. It's also the correct viscosity, so I imagine it works just fine. Ditto on shell for motor oil too. I've even run shell rotella in some of my gas burners and it keeps the inside of the motor clean. Never have used the...