SynLube was used in the 1984 cars that had 850 ccm engines and were planned for Southern California ONLY (the contract with ZASTAVA was for 5,000 units) they also had BOSCH EFI (same as that on FIAT & BERTONE X1/9 since 1979) but when Bicklin bought the distribution rights for REST of the USA, he decided to cheap out the car and put in a carburetor and just to have the same torque and power they had to up the engine to 1.1L so not really a smart move. As the car lost 10 MPG by doing so and was only 5 MPH faster (top speed).
As a result there were not 1984 or 1985 cars sold in California (they could not meet the emissions levels under the 5 year certification standards with a carburetor).
The YUGO 45 was the car for $4,500 with 10 year and 100,000 miles Warranty and FREE maintenance (due to SynLube) GOT ALL THE INITIAL PUBLICITY and started the YUGO-mania, but that never really happened and in 1992 KIA and latter HYUNDAI adopted the 10 year Warranty Idea.
So like it or not YUGO did start lot of "new" trends that still live on today in the Auto Industry in one way or another.
I doubt BMW and latter Mercedes would have given people FREE maintenance if YUGO did not do that FIRST.........
While due to US embargo YUGO went oout of business in 1992, it was made in Serbia till December 2008 - over 800,000 of them were made of which 167,000 were sold in USA.
SO not exactly a "failure" as some may think !!!