You guys really don't get it do you? The issue has nothing to do with the durability or flashpoint of the oil itself. The issue is with the bearings that Nissan now puts into engines as a result of trying to be more environmentally responsible. As has been thoroughly explained by Mike Kojima on his blog:
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Oh, I noticed all of those 350Z on my way home broken down due to too many miles on the engine combined with warm oil. Semtex, I think you know the answer to all of this. What I just said above. Put on the cooler and get on with it. You know, it's funny. I was at a Z meet, and this person with the only other 370 sat and bitched about his oil getting too hot. I said, "Are you having any problems yet?" He said, "No." I said, "Are you tracking your car?" He said, "I might." I said, "You bring it on the track, put on a cooler and stop bitching." You all have plenty of options. Use them. I repeat now for you Semtex, Track=Cooler. The Midwest's quality control engineer said, "This engine is built to handle all oil temperatures right up to the limp limiter." He was involved in the 370Z's testing and traveled the world to make sure this thing was ready for the road. I have his cell number and he has mine. This is right from Nissan. Why would he make this up? He worked with the Japanese, and knew exactly what the engine can handle. He said the engine is just as reliable and you will have no oil-related problems if you keep the oil from prolonged stints over 300 on the guage. What more do we need? The other person on this board who talked to this guy is Spearfish. He gets it too. What more do you want? Track and cooler. He said that. The engineer also said any car that's taken on a racetrack for prolonged periods have to be prepped for racing. He happens to race a Porsche. He needed an aux. oil cooler but tries to keep is track temps from 240-260. Hmmm, an engineer. Those temps. He said I could meet him at the track by me and he'll show me. Come on, is this enough? |
I repeat, from Mike Kojima's article on his blog: "the new environmentally friendly bearings started to loose their load bearing capacity at temperatures as low as 260 degrees." [sic]
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From sources I've read and people I've talked with (and there has been quite a variety at this point), the flashpoint of an oil is a measure of how readily the oil actually breaks down from heat...the higher the flashpoint the more heat the oil can take before it starts to breakdown (Synthetics have a higher and in some cases a much, much higher flashpoint than non-synthetics). All oils break down and heat is a major factor in that but the higher the flashpoint, the longer the oil life and the higher the temperatures it can tollerate before it breaks down. Or another way you can look at is that flashpoint indicates how long the oil can do the job of protecting the engine before it becomes unable to do so and the higher the heat; the more frequently you should change your oil. However, it is also true that the viscosity of the oil changes (thins) as oil increases in temperature so, all other things being equal (and they rarely ever are); the higher your engine oil temperature is, the less "protection" the oiled engine parts have because the viscosity gives a thinner and thinner layer of protection as the heat increases. This would be different from how long the oil can do its job but rather how well it can do its job at any given temperature. What I've yet to see anybody translate is how much or how little all this actually affects the life of an engine. If the 3.7 engine oil consistently runs at 240 degrees; how much sooner, on average will the engine fail than if it was consistently running at 220 or 200 or 180? I think we can all agree that, 180 or 200 is "better" for engine life than 240 but that doesn't tell us how much better...at the consistent 220 mark, will the engine die at 210,000 miles instead of 220,000 or will it die at 155,000 instead of 220,000? The bearings may well break down and fail "sooner" with high temps than not but how soon and will anyone own their 370 long enough to even find out??? I don't know the answer; if anyone actually does they should speak up!!! |
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Ahhh, Robert. As the oil turns... I keep trying to stay out of this, and someone always has to bring it back up. I practice all the self-control I can, but just get to the point of people not reading the old posts. I made a quick recap in my post above. Someone in another post said it best. "By the time this would even be an issue, if it even is an issue, you'd be along to your 3rd vehicle already." Mine would probably need every other part replaced before any of the motor's parts would die. Here's another statement... So you have the "eco-friendly" bearing. So why wouldn't the limp mode be at 255? Ufff. |
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When does limp-mode kick in? 280? So Nissan evidently decided put the limp mode threshold at 20 degrees before the disintegration temp, probably as a bit of a buffer. But I don't want any weakening of the bearings at all if it can be avoided. If there was a way we could set our own limp-mode threshold temps (like how we can adjust our shift light), I'd set mine at 255. |
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You just said above you didn't have on you cooler, but are deciding to put it on. To me that's not having one on your car. |
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