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I stopped by the John Deere dealer this moring to pick up a few things and ask about reseting my the "chg oil" message. For those of you who have a Ztwo or Tank the recommend oil change intervals are pre programmed into the hour meter. The "chg oil" will begin flashing 1 hour prior and stay on 1 or 2 hours past the recommended interval.

Anyway while I was talking to the tech I told him I changed the oil yesterday and that I put Mobil 1 10W30 in it. He responded be saying it was a waste of money to run mobil 1. He claimed that if the engine was going to run synthetic oil it should have been broken in with synthetic oil. :confused: He says its a waste of money to switch over now. He said it would have no benefit over regular oil changed at normal intervals. His explaination was that mobil 1 will absolutely out perform regular oil in high stress-high temp conditions but these motors was never reach that level.

Now I don't have my doctorate in mechanical engineering but from the research I've done on my own I've learned an engine must be broken in on regular oil then switched over. As far as the mower not needing a synthetic if oil is changed at proper intervals, that's plausable> Im sure there is alot of different opinion out there on this. Lets here them.
 

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Well, engines really don't have to be broken in with dino oil. Corvettes and other high performance cars come with synthetic from the factory. From the research I've done, synthetic oil is great stuff for just about any engine. Look at the independent test results on Royal Purple's website. Here is a link to a cool visualization of how good synthetic oil is for bearings and other things http://royalpurple.com/rp-performance-advantages.html

Most of the time when a manufacturer does mention synthetic oil in the owner's manual, they also say not to extend the drain interval. This is just to cover the manufacturer from liability if someone puts 500hrs on one oil change and blows the motor or something. With a premium filter, synthetic oil can greatly increase oil change intervals. I've seen truckers claim to go over 30k miles on an oil change. Typical change intervals for big trucks is 10k to 15k. There are definitely cost savings to using synthetic oil. Even if you the oil costs twice as much and the interval in doubled, you pay the same for the oil, but less for labor (one change instead of two), you reduce fuel consumption, and you reduce the chance of future breakdowns.

I guess not all Deere dealers get the same training. This guy says to not use synthetic oil while my local JD dealer runs synthetic in everything he owns, from tractor trailers to mowers and Gators.
 

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Im a hot rodder at heart, Ive seen/heard test done on synthetic vs conventional from lubrication specialist. I run Mobil 1 in my Chevy, and change it once a year. I run Royal Purple in my Go-Devil and plan to change it at 50-100hr intervals. If youre gonna change it regularly I dont see any benefit, but if you want to extend your intervals, by all means it will save you money
 
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