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Discussion Starter #1
Hi ALL !
I've used mineral oil in my car forever, change the oil about every 3 months regardless of mileage. Switched over to a Castrol Syntec blend and noticed on start up (after a long night's rest) some blue smoke coming from the tail pipe. It doesn't do this every morning.

Guess the Syntec blend is causing the valve seals to leak somewhat, switching back to Dino oil on the next change to swell up those valve stem seals.

Has anyone noticed this after switching to a synthetic blend? My car is at 118.5K (3.2L).

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