worst motors of all time

breakstuff said
Tech 4 AKA Pontiac iron duke 2.5 was a great engine. I owned a Sunbird for 3 years with that engine, 200K on the clock. I never changed the oil, beat the living crap out of that car, best off road vehicle I ever owned. -20 degrees outside? no problem, she'd fire right up. I traded the car for a torquer 340 intake, I got robbed!

Hows about a Pontiac 301 with it's 3 main bearings, or a buick 231 with its non existent oil pressure?

The 2.5 R or U code (iron duke) engines were some of the best GM ever produced. I worked at a GM dealer in their heyday and they were long lasting little buggers. Headbolt breakage was the only major problem. I owned a 82 Skylark and sold it to my brother-in law with 230,000 on the clock. He drove it to 260+ and sold it to someone else.

The early 231's were not good. Buick borrowed the aluminum timing cover/oil pump housing design from their v-8's at the time. (bad design) After some miles the oil pump would wear and low oil pressure at idle. Buick had a oil pressure sender that would turn the idiot light on at 0#. The stock sender was a 5# switch. That was their fix! LOL The computer/carb. engines were pure garbage. In Late 1985 the figured out how to make injection work and that changed the 231 for the better. A few years after that they put a gearoter type oil pump on the crank snout and turned it into one of the most dependable engines GM has ever produced. I lived through the transformation. We had many customer cars with 200,000+ on the clock.

pacuda59 said
GM introduced a 6 cylinder version of the Northstar in 1999. I had one in an Oldsmobile. Within 20,000 miles it was eating a quart of oil every 2500.

A quart every 2500 is very normal oil usage. A quart/750 is considered excessive.