RW>I started using Penzoil synthetic a couple of decades ago, but switched to
RW>Mobile One around 15 years ago. When I bought the Z28 in 2001, it already
RW>had Mobile One in the engine, a factory synthetic in the 6spd trans and
RW>the posi rear end.

Teh Top Three raqted Synthetic oils are Amsoil, Penzoil, and Mobile I
in that order. I picked Penzoil becasue it is just as the other two and
it costs less. Rembember "A Penny Saved is a Penny Earned"  :-)
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 þ SLMR 2.1a þ 0