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Did the car experience engine hesitation before you poured in the engine restore product? What reason are you adding the restore additive in the first place? Did the mechanic explain what was the original cause of the hesitation before he reset the ECM?
Personally, if I added an additive to my engine that caused hesitation soon afterwards - I would not be pouring in that stuff into the engine ever again. Adding engine restore with a much heavier engine oil is just a potential recipe for disaster. Not only will you be running a heavier oil, but also have engine restore gumming up the works.
When adding anything else than motor oil - keep the changes to a minimum, so that you can monitor the effects - before and after. Running a heavier motor oil weight is not recommended on the 1ZZ-FE unless the conditions fully require that heavier oil. The OEM viscosity is chosen for a good balance of engine protection, good fuel economy, and proper lubrication.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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