Tuesday, July 2
The factory oil pump in 1.8ltr motors has 26-28-30mm gears and many produce
insufficient volume/pressure after X miles. X varies, we can't curse any one pump manufacturer and have even sent LASO and FEBI/Bilstein of Germany and Shadek of Mexico, OE suppliers several samples and all claim NO PROBLEM FOUND. The 36mm replacement used as OEM on the 2.0 ltr motors, starting with Audi 80/90 and all the new Golf III/Jetta III often eliminate this problem on older motors as per European Car magazine article "Inside the 2.0" of 2/95.
We stock these pumps and they are available through your local dealer as 027 115 105E retailing for $185.--a lot cheaper than a new car or motor.