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Vans & Minivans Mazda Mazda5 Mazda5 Engine Issues
21 messages, Last post on Mar 03, 2009 at 3:37 PM
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In the owners manual, it says to use 5W20 motor oil for all changes. I am at the stage of changing my oil and I want to put in Mobil 1. It is cheaper to buy 5W30 than 5W20. Could I use the 5W30 in place of the 5W20?
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Replying to: partsguy1 (Jul 04, 2006 8:39 am) fowler3
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Replying to: fowler3 (Jul 04, 2006 7:39 pm) Not likely, especially if it is Mobil 1 5W30. The lower viscosity stuff is used for emissions reductions, but is actually poorer for protecting the engine vs 5W30. John |
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I just purchased a new 2006 Mazda5 Sport auto with 16 miles on it. I drove the car around town for about 20 miles gently, then I took in on a 85 miles one way highway trip, driving at ~80mph  3500rpm for about 45-60 minutes, then, drove it around town again. On the way back I did about 80mph for 30 min, then hit traffic for 20 min, then 20 min cruising at ~80mph again. Now the car has about 380 miles on it. My question is how much damage have I done to the engine. I know the manual states not to maintain one constant speed for a long period of time for the break-in period. What is a "long period of time" 10, 30, 50 minutes ? I searched the net and read different new engine break-in articles, including the motoman' article, but none specify how long is a "long period of time". Any input would be appreciated...tks 
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Replying to: ma3x (Aug 31, 2006 9:13 pm) You should follow the break-in instructions for the first 600 miles: No fast starts, i.e. flooring it; No hard braking such as running up behind traffic already stopped at traffic lights and slamming on the brakes; if you have a manual tranny don't down-shift to reduce speed, use the brakes with moderate pressure and allow the car enough distance to stop; don't accellerate above 3500rpm for the first 600 miles; and up to 1000 miles increase rpms slowly. In other words don't drive it like you stole it and/or it already has 5000 miles on it. The engine is tight (green) and needs time to break-in. What you are doing the first 1000 miles is going easy on it until the rings seat properly to avoid an "oil burner" later on. Hard braking and downshifting with the tranny manually puts a lot of strain on the engine. Fast take-offs does the same thing and driving for long periods at one speed doesn't allow the engine to run-in at a wide range of rpms. It won't run smoothly when you do need higher rpms. Hope this helps. fowler3
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Replying to: fowler3 (Aug 31, 2006 10:33 pm) Also is there a way to check if there has been damage to the engine, or only time will tell ? I didn't notice any difference in engine sound yet, I suppose that is a good thing ?
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Replying to: ma3x (Sep 01, 2006 4:40 am) You can find numerous articles on the net related to break-in periods. I would side with being a little harder on the engine rather than softer. IF something is going to break, it will break whether you go soft or hard. I changed my oil at 6500 KM and went with Mobil 1. This should reduce any wear and tear on the engine, now that it is broken in.
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Replying to: partsguy1 (Sep 01, 2006 10:32 am)  . Here in FLorida, most of the driving is done on the highways, so one way or another you must keep with the traffic. Taking the side streets is a nightmare sometimes, taking you maybe 1 hour to get from A to B instead for 15-20 min highway ride. As far as the oil, the dealer provided me with the first oil+filter change for free, so I'll most likely go with them, and after that 19.95 for life of the car...that's a decent deal I would think.
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Replying to: ma3x (Sep 01, 2006 4:44 pm) |
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Replying to: jaxs1 (Sep 01, 2006 6:26 pm) The poster who said, "If it breaks the warrenty will cover it." forgets one important thing -- the *Black Box*, which comes on most new cars. The Black Box records the engines speed and other info before and following an accident and before something happens to the engine. If the manufacturer discovers the car was being driven "hard" during break-in they can refuse to repair it. And, NO, the Black Box can not be disabled. It is so tightly intigrated with the safety equipment and on-board computer it can't be hacked. Isn't it much easier to just do the break-in and be done with it? fowler3
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