EHOW SUMMARY OF FLUSH USE DANGERS.
NOTE: This warning from Hyundai is very similar to the one from GM in 2011.
EHOW has written a good short summary, so here is the text if you don't like links:
Engine Failure
The most common danger of engine flushes is complete engine breakdown. This is ironic, especially since the pioneers in engine flushing systems, Motorlife, say that routine engine flushing improves an automobile engine's overall performance, restores its efficiency and prolongs its life. According to Chris Martin of America Honda Public Relations, a car engine is most likely to suffer engine damage immediately after an engine flush. Several incidents involving auto maintenance chains such as Jiffy Lube and EZLube gave evidence of this, including customer Pat Marriott of Kansas City, who claimed that a Jiffy Lube engine flush service caused $5,000 worth of damage to his Nissan Sentra.
Sediment Clogging
According to an undercover investigative report by NBC Los Angeles on Jiffy Lube's engine flushes, the chemicals used for the engine flush are meant to break-down the sludgy deposits that build up inside a car's engine. However, the debris or sediment from the flush procedure could end up clogging other parts of the engine and cause further damage. For this reason, many major car dealers such as General Motors and Ford, among others, do not cover damages caused by engine flushes in their warranties. However, during NBC's undercover investigation, some auto technicians suggested flushing the engine anyway, claiming that car manufacturer's recommend doing so, which is not the case.
Damaged Engine Seals and Bearings
In February 2009, Hyundai Motors issued a technical service bulletin that recommends against engine flushing for all Hyundai models. The reason: the method and proprietary chemicals used in flushing engines can cause internal damage, specifically to engine seals and bearings. Damages to these parts can result in dangerous oil and lubricant leaks. In fact, Popular Mechanics, an online magazine, lists engine flushes as one of the top five unnecessary car maintenance procedures because an unusually dirty engine is not a normal problem.
Note the Hyundai warning was renewed in 2012 and the GM one is still current, the other manufacturers are just happy the sell you a new engine!
NOTE: This warning from Hyundai is very similar to the one from GM in 2011.
EHOW has written a good short summary, so here is the text if you don't like links:
Engine Failure
The most common danger of engine flushes is complete engine breakdown. This is ironic, especially since the pioneers in engine flushing systems, Motorlife, say that routine engine flushing improves an automobile engine's overall performance, restores its efficiency and prolongs its life. According to Chris Martin of America Honda Public Relations, a car engine is most likely to suffer engine damage immediately after an engine flush. Several incidents involving auto maintenance chains such as Jiffy Lube and EZLube gave evidence of this, including customer Pat Marriott of Kansas City, who claimed that a Jiffy Lube engine flush service caused $5,000 worth of damage to his Nissan Sentra.
Sediment Clogging
According to an undercover investigative report by NBC Los Angeles on Jiffy Lube's engine flushes, the chemicals used for the engine flush are meant to break-down the sludgy deposits that build up inside a car's engine. However, the debris or sediment from the flush procedure could end up clogging other parts of the engine and cause further damage. For this reason, many major car dealers such as General Motors and Ford, among others, do not cover damages caused by engine flushes in their warranties. However, during NBC's undercover investigation, some auto technicians suggested flushing the engine anyway, claiming that car manufacturer's recommend doing so, which is not the case.
Damaged Engine Seals and Bearings
In February 2009, Hyundai Motors issued a technical service bulletin that recommends against engine flushing for all Hyundai models. The reason: the method and proprietary chemicals used in flushing engines can cause internal damage, specifically to engine seals and bearings. Damages to these parts can result in dangerous oil and lubricant leaks. In fact, Popular Mechanics, an online magazine, lists engine flushes as one of the top five unnecessary car maintenance procedures because an unusually dirty engine is not a normal problem.
Note the Hyundai warning was renewed in 2012 and the GM one is still current, the other manufacturers are just happy the sell you a new engine!
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