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Cats and Oil
I have a 94 90 Q with about 34 K miles. In August I replaced my LHS cat as
fragnmented and clogged up the works. Last week the RHS went. When I asked
the dealer what was the cause he said it was an oil problem. The dealer has
Castrol GTX (as I have for years). Apparently it contains a zinc compound
is hard on certain cats. He has switched to Castrol RX. Apparently Castrol
unique here as any number of other SE grade brands also contain the
same compound. I have used Castrol GTX for yearts in other cars and never
experienced a problem.
Anybody with similar information?