Si tiene las revisiones en concesionario no debería ser cacho, es más, debería estar impeque(?).
Lamentablemente eso no siempre asegura algo y en el caso del CX7 Turbo menos, ese motor tiene varias yayitas documentadas. Se de algunos reparados por garantía por Derco, otros tapón.
Por ejemplo un recall:
Model Starting S/N Ending S/N Model Spec CX7 2007-2008 000001 209008 P/D BEFORE 2/15/2008 MAZDA6 2006-2007 000001 999999 ALL MAZDASPEED6 MAZDA3 2007-2008 000001 880368 P/D BEFORE 2/6/2008 Related Category/Subcategory/Symptoms
ENGINE / MECHANICAL / WHITE SMOKE,BLUE SMOKE
ENGINE / EMISSIONS SYSTEM / EXCESSIVE OIL CONSUMPTION
ENGINE / EMISSIONS SYSTEM / WHITE SMOKE,BLUE SMOKE
ENGINE / EMISSIONS SYSTEM / BLACK SMOKE
ENGINE / MECHANICAL / EXCESSIVE OIL CONSUMPTION
MTOL - 5505 Dealer Repair Information
Symptom and Conditions
Applicable Model(s) VINS
CX-7 JM3ER ****8* 209008 Produced before 2/15/08
MAZDASPEED6 ALL ALL
MAZDASPEED3 JM1BK ****8* 880368 Produced before 2/6/08
Some customers may experience white/blue smoke from their exhaust pipes
after prolonged idle periods and/or while driving in traffic at very
slow speeds.
This condition may be the result of the turbo's oil supply not being
able to adequately drain out of the turbo during long idle periods.
Vehicles having this concern should be diagnosed using the following diagnostics procedure.
Repair Procedure
1. Confirm that the proper maintenance intervals have been performed.
2. With the engine at normal operating temperature, allow it to idle
for an extended idle period.
Caution:
Closely monitor the engine coolant to the assure the engine does not Overheat.
3. If smoke from the exhaust is present after the extended idle period,
take before pictures of the smoke, then change the oil and filter
using 5W/40 (synthetic). After the oil change, in order to burn off
the oil that remains in the exhaust system, perform the following:
start the engine, check for oil leaks, then let it idle for 10
minutes, after the 10 minute idle period, increase the RPMs to 3000
for 1 minute, repeat idle test to confirm that no smoke returns.
A: If the smoke returns, contact the Technical Assistance Hotline
(Select option #2 for Major Assembly Authorization) with the oil
change history information, to attain an authorization for a turbo
replacement.
B: If smoke DOES NOT RETURN after the repeat idle test, NO other repairs
are to be performed at this time. Explain to the customer that MAZDA
is currently working on an improved positive crankcase valve (PCV)
system to reduce the engine crankcase pressures to allow the turbo's
oil supply to drain from the turbocharger more efficiently This fix
will be available approximately within 90 days and at that time the
oil will be changed back to 5W-30 and the improved PCV system will be
installed
