What you all are describing is the same as from the days of high-detergent vs.
non-detergent oils. If you have been running the non-detergent variety, and
then change to the high-detergent type, you run the risk of stirring up the
old sediments and hardened coatings left from the non-detergent type. You
face the potential problems as all have been mentioning.
I remember helping a friend with an old car (American, not a British sports
car) that he wanted to revive. We dropped the oil pan, and the sludge was
1/8th to 1/4 inch thick. The walls inside the lower part of the engine case
had all this hardened deposits that were flaking off, into the oil. There was
no choice but to fully disassemble the engine and tank it.
-----Original Message-----
From: 6pack-bounces+jar7u=hscmail.mcc.virginia.edu@autox.team.net on behalf of
Bob Danielson
Sent: Sat 3/8/2008 9:32 AM
To: triumphs@autox.team.net; '6-Pack'
Subject: [6pack] Synthetic Oil Engine Damage
One of the Hemmings editors had his engine seize and is blaming it on using
synthetic oil in an engine that had previously only burned regular oil. The
car had 73,000 miles.....mostly all short trip miles. He said "The cylinder
head was covered, not in sludge but with hardened, baked oil. Worse was the
lifter valley area below the intake, as shown in the photo. According to
several sources, the synthetic oil eventually broke up the old, hardened
deposits (thanks to the original owner's short-trip driving style), which
then clogged all the oil galleys and oil pump, which then ruined the
bearings."
Read it all here (http://tinyurl.com/2l7f46) and double click the picture of
the head.....it really is pretty ugly what happened.
Bob Danielson
1975 TR6 CF38503U
Running w/ Throttle Body Injection
http://tr6.danielsonfamily.org
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