TD New Guy
Join Date: Nov 2008
Location: Decatur, ILL.
My Ride: 1986 GLH TII
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Re: Synthetic Oil question
My tale on why I only use synthetic oil, sorry if it's a little long winded:
In 1986 I bought a new GLHT. In '87 it began acting like it was running out of gas when I got below half a tank of gas, so I kept it at least 3/4 full (already had an appointment at the dealer to look at it). I was taking an exit ramp very quickly with the aftermarket stereo cranked, and when I stabbed the go pedal to merge I got nothing. I turned down the stereo and tried again...nothing except for the sound of a rod knock. Looked in my rear view mirror to see a cloud of blue smoke following me...oh no. I nursed it to the dealer. What happened was one of the fuel pumps quit, and when I was taking the curve the internal fuel pump was uncovered, leaning out the engine. The dealer had to replace the turbo, rebuild the bottom end, and upgrade to the '87 style fuel system. After allowing about 500 break-in miles I started using synthetic oil only with about 7500 to 8000 mile change interval. In the winter of 1990 my GLHT had over 100k miles on it, many a 1/4 mile at a time (14.95 @ 93 mph), and still ran great up until my wife (now ex) had a heater hose blew in sub zero weather. The heater core was bypassed by me while I was at work so she could make it home. She decided to do some more running around and added water to the radiator, and didn't inform me of this when I got home from work. The next morning I went out to replace the hoses, but started it up for a few minutes to get some heat under the hood (was no more than +5 degrees F). After about 2 minutes of running I saw steam rising from the rear of the engine. Looked underneath and saw a foot wide waterfall coming from the back of the engine...cracked the block...bad! In the spring I found another 2.2 Turbo engine and swapped it into my GLHT. I began stripping the original engine of usable parts (everything but the block) and when I pulled off the head I was amazed that there weren't any ridges in the tops of the bores, and I could still see the hone marks in the cylinders. The only thing that could have reduced the wear is the synthetic oil, sure wasn't my driving habits.
In 2003 I bought a 1 year old Dodge Intrepid with the notorious 2.7 V6. Once the power train was out of warranty I switched to full synthetic, with an oil change interval between 10,000 and 12,000 miles. Never had an oiling issue with it. Sold it to my daughter with about 150k on the clock, and the few years she owned it never had an oiling issue either.
A lot of times money was tight, so I didn't always buy a name brand synthetic, I would buy the cheap Walmart Super Tech full synthetic, never a problem.