I'm almost certain that you should run lighter petroleum oil for at least 2500 miles, or you'll do more than just create a glaze problem. Yo don't say if this engine was entirely remanufactured or just a "problem ring" replacement? Not properly breaking in a new/rebuilt engine can completely destroy the cam and rings, and should be done with petroleum based (read: not synthetic) oil. One published/suggested process: Our recommended break-in is as follows: * Joe Gibbs Break in oil 10/30 with high ZDDP, and filter for 30 minutes. Then change filter. * Change oil/Filter again at 2 hours, or 150 miles * Joe Gibbs break in oil with high ZDDP and new filter for additional 250 miles. Then change oil/filter * Regular 10/30 and good filter for additional 2000 miles. At 2000 miles, check your oil consumption. if you are fine, then switch to synthetic. If not, run hard to 3000 miles. Then swap to synthetic regardless. bob On Sep 8, 2013, at 5:03 PM, Paul Rogers <wognacious@GMAIL.COM> wrote: Hey Listies, I finally got my 2.1L long block with components from my 1.9L finished and It's Alive! It actually works much to my amazement. I'm in the process of dialing it in now. I've got the timing pretty close for now and I'm attempting to bleed the cooling system. One thing I'm a little concerned about is the amount of blue smoke. I haven't run it for longer than about 10 mins or so and that wasn't all at the same time. The guy I bought the long block from said he had it in his Vanagon but took it out because it was using a lot of oil. He said he fixed the problem ring but never used it again. I've got Mobil1 15-50 in it and I've read several posts on the Samba that the ring won't seat with synthetic oil in. In fact I've read that I can do some serious damage to the cylinder by causing it to glaze over and the ring will never seat. Can someone please verify this for me. The engine is running sweet, sounds good too. But it is spewing blue smoke, I figured it would but I have no idea what a reasonable time it should take to stop smoking. Any input from the brain trust of the list will be gratefully appreciated. I don't want to do something wrong at this point. TIA, Paul in Tracy
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