j beede

Joe Gibbs DT40 5w-40 sounds like the way to go in my 997.1. Of course the concern is catalytic converter damage. What has your experience been with passing smog in CA--or more importantly, failing smog after using high ZPPD oils?

LexVan

Non issue. And DT40 is not any higher in ZInc and Phosphorus than Mobil 1. Maybe 100 ppm.

jhbrennan

It's a Porsche approved A40 oil, correct...doubt very much it would be on the list if it caused premature cat failure. Find something else to be concerned about...like water.

LexVan

NOT a Porsche approved oil.

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jhbrennan

Thanks for the clarification...maybe OP should be worried then.

Sneaky Pete

Woohoo an oil thread

Quadcammer

you'll be fine.

DC911S

Oil thread on a car forum, what could go wrong?

PJorgen

They no longer use the tail-pipe sniffer in California, so that shouldn't be an issue.

If your car is burning so much oil that it causes cat failure then you have a more serious problem than just failing a smog check.

Carmichael

Oil thread!