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In my experiance I have started using just 1qt of Syntec 5W-50 and then the rest is plain 30W. But I do this because of the heat in Texas. I have found that on an older car it will leak for the first 1 or 2 oil changes and then it will stop because the gaskets seem to absord some of the snythetic oil. Don't laugh, I had a 1984 Honda Accord up to 267k, a Mazda B2000 truck up to 304k, and a 1990 Accord up to 265k with no major motor problems. Although the truck was leaking really bad at the rear main before I let it go( clutch, starter and 3rd gear syncro were also dead), but it ran great. On the down side my 1994 Ford F150 had to have the oil pan gasket replaced at 180k, but it has 208k on it now with no new problems.
Good luck.
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