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1995 993 Oil loss after engine rebuild

  • 1995
  • 911 Carrera Cabriolet
Mileage: 
97 500
Engine
Marlboro, 
New Jersey

I have owned this car for the last 10 years and put on about 5,000 miles a year to and from work (no racing).  This year, I had the engine rebuilt due to oil consumption being about 1 quart every 800-1000 miles.   During the rebuild, the mechanic gave me the option of doing the bottom end also, which I decided to go for since I plan to hold the car long term and did not want to have to worry about any problems in the future.  As it turned out, there were no issues with the bottom end.  The total cost of the rebuild was about $16,000.  After I got the car back, for the first 1,000 miles I drove the car cautiously as directed using the break in oil.  I noticed that my oil level gauge after about 450 miles was showing that I needed oil, but my mechanic told me not to worry about it.  I had the oil changed at 1,000 miles with a high quality sythetic oil that my mechanic always uses  After my oil change, I continued to notice a rapid oil consumption on the gauge, with the oil level guage showing that I needed oil after about 700 miles.  My mechanic said that it was impossible that I was losing so much oil without a leak under the car and told me not to worry about it and that it may be the gauge.  After about 2,400, I decided to stop by the mechanic just to have him check the oil on the dipstick.  He was surprised to see that the dipstick was dry.  He had to add over three quarts of oil.  He then said that I should switch to conventional motor oil at my next oil change to fix the problem, but this does not sound right to me.  I have not used conventional oil in any of my cars in over a decade.  Does using conventional oil after a full rebuild make any sense?   I am just not comfortable with this.  Also, I notice a very large amount of blue smoke on cold startup, which my mechanic says is normal, but this is more smoke than I have seen in  the 10 years I have owned the car.  I alway now roll the car out of the garage before starting it so as not to smoke up my garage.  Do you have any thoughts on what could be wrong and on whether conventional motor oil is the way to go?  Thanks.

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