很多纳友反映9000消耗过快的情况，似乎普遍。我没有用过9000，不知道9000的温度标号都是多少的，因为机油消耗快，可能还和温度标号有关。
我的看法和疑问：
1、2003年12月29日，赛纳出厂为什么换了机油？机油由SJ 10W40换为 SL 5W30。用这两种油后，厂家推荐的保养里程明显不同。前者是10000公里，后者是15000公里。究竟是等级提高的原因还是温度标号的原因？
2、赛纳发动机怠速的声音，略比日系车大。我曾经看到过一篇文章，说日系车精度配合最高，欧洲其次，美国最后。如此事实准确的话。赛纳发动机用油不应当使用机油成膜薄，油膜延展性最好的油。如全合成、且黏度较低的油品，比如9000系列5W30。因为油会渗掉特别是渗到缸里燃烧掉，消耗会过快。而且，因为油膜太薄，不能更好地填充到机件间的缝隙，润滑效果也不会很理想，声音也会大一点。
3、如果第2条成立，那么，赛纳在车子使用几万公里后，应当换用高温度标号略高一档的油，比如5W40，当然，级别用半合成可能比较好。因为40标号的油比30标号的油，在100度的黏度系数通常是要高些的。
4、凯旋发动机本体与赛纳一样的，严格要求用10W40的油。虽然它严格要求用10W40的油是因为VVT功能的要求，但发动机本体润滑，也说明用高温标号40的油是完全可以的。也就是说，适用于赛纳。
5、复合温度系数的机油，高低温温差越大，油品价格也就越贵。是否神龙内部肯定5W40的油比5W30的油更加适合赛纳，只是为了减低成本，选用5W30。
6、下面是在机油专家板块找到的，一个网友回复马六用油时贴的。E文好的朋友请翻译一下关键意思。特别是红字部分。
What Type of Oil Should I Use in The Mazda 6i/6s? Whats the Stock Oil? Is Synthetic Ok? How Long Can Synthetic Last? What Type of Oil Should I Use in the MPS 6? (Mazdaspeed 6)
Both the Mazda 6i and 6s have the same oil requirements, a 5w-20 oil which meets or exceeds the Ford WSS-M2C-153H specification. As long as you use an oil which meets these specifications, you will be fine as far as the car's warranty is concerned.
The stock factory fill is Motorcraft 5w-20 semi-synthetic. This is a bit more expensive then many 5w-20 oils, but also very good at protecting the engine. Its one of the best non-synthetic 20 wt oil's on the market currently, so you can't go wrong sticking to what mazda puts in.
If your looking for something that gives a bit more protection, you'll want to switch to synthetic oils. Of the low weight oils on the market currently, 0w-20 mobil1, 5w-20 redline, 5w-20 royal purple, and 0w-30 German Castrol are recommended. The 6's seem to like oils in the 20-30 wt range, and respond best to those viscosities.
Using synthetic engine oil will not void your warranty, and the switch to synthetic can generally be done at anytime...but is usually recommended after the first thousand miles. (To allow for proper break-in to occur). Its highly recommended to use a filter with synthetic media if your switching to synthetic oil (such as the K&N or Mobil1), this ensures adequate filtration on extended drains.
Synthetic oil would technically last indefinitely, if not for the byproducts of combustion making their way into the medium. Because of this, the additives in the oil are depleted over time, and will eventually exhaust themselves, being unable to take up additional byproducts. As such generally synthetics can be run to 10,000 miles without a bypass filter without issues. If you plan on running such a long OCI (oil change interval), make sure to get a UOA (Used Oil Analysis) to verify the oil's TBN (Total Base #, or additives remaining) is still in the green range at that point.
You also don't want to extend an OCI past 7.5k miles during your primary vehicle warranty period. Failure to do so (there is about a 1000 mile buffer range) can result in voiding of your powertrain warranty. Always remember to save your recepits and log oil changes if your DIY'in!!!
Mazdaspeed 6 Information and Recommendations
The Mazdaspeed is an upgraded version of the standard 6i platform using forced induction to produce a significant amount of power over the other 6's in Mazda's lineup. The turbocharger in the MPS 6 is both water and oil cooled, which helps reduce the strain on the vehicles oil system slightly, but not completely, over a fully oil cooled turbo.
Even with a water cooled turbo, temperatures of the oil in the turbo can still reach upwards of 300F, which can greatly reduce the operating efficency of the oil.
Because of this, synthetic fluids are recommended in the weights laid out in the service manual (5w-30 and 10w-30). With a non synthetic oil, you shouldn't let intervals go too far past 3-4k miles. A UOA can confirm this as sheering and drops in viscosity grades will occur when the oil is pushed past its temperature ceiling.
Additionally, early UOA's of Mazdaspeed 6's indicate fuel dilution...or excess fuel getting into the oil. This could be a byproduct of the Direct Injection system, or just Mazda's incrediably rich teir EPA2 fuel curve at 4k+ rpm (nearly 10:1 at 4k rpm). Regardless, fuel in the oil will cause sheering, and reduce the maximum interval you can extend an oil change. As such, even with synthetic oils, I would be cautious to extend an interval past 5,000 miles without also doing a UOA to confirm the oil is both still within grade, and still has sufficent TBN to continue protecting the engine.
So short summary.
5w-30 or 10w-30
Synthetic highly recommended with 4-5k interval, don't go past 5k without a UOA
If you use semi-syn, plan to change every 3-4k miles.
You may be wondering why these recommendations are for such short intervals, when companies like audi, and vw spec up to 10,000 mile oil change intervals in their turbo charged vehicles.
Thats because the audi/vw owners that ran 10,000 mile intervals ended up with sludged engines, which is why in 2004 audi/vw was forced to extend the warranty of all 1.8T owners due to improper recommendations to their dealerships. Those owners that stuck to 5k intervals with synthetic fluids never had any problems.
[ Last edited by BFY on 06-10-04 at 11:14 ]

谢谢宁版主加精加分。
因为大家谈，所以，请各位把各种用油经历经验都写出来，便于大家参考总结。
机油对于一部车来说，简直就相当维生素于人那样的重要。原来我单位一部高尔夫（最早的那种小的，一汽产都市高尔夫），车子有几年不在我手里。别人胡乱搞。结果，车况下降非常之快。不到10万公里的车，清早点火，浓烈的蓝烟会烧半分钟。
赛纳不是一部值钱的车。但一部车养护好了，2、30万公里可以不动缸。且不说中修的维修费用如何，但车况下降，开起来真的不舒服。

是什么？那部小车其实非常好开，高速非常稳。市内又非常灵活。
[ Last edited by BFY on 06-10-06 at 21:11 ]