同品牌同番數機油可以混用?

nickding1220 wrote:
半合成跟全合成或是都是全合成但機油檔次不同可以混用嗎

Today's high-performance lubricants are formulated with a carefully selected balance of performance additives and base stocks to match the lubrication requirements of the equipment in which they are used. When lubricants are mixed with fuel or different lubricant types, this balance is often upset. Mechanical problems leading to shorter equipment life can occur.

Castrol Technical Manager Brian Utton says: "Any increase or decrease in the level of a single additive or the introduction of a new additive to a lubricant can affect the stability of the formulation. This is especially true in terms of wear and deposit protection."

Even if the base oils are compatible, there is the prospect that the additives used to create necessary performance properties could conflict, producing lost lubricant effectiveness.

Remember, modern lubricants are sophisticated products, formulated to meet the demanding lubrication requirements of modern equipment. The old saying, “oil is oil” no longer applies. Mixing lubricants is fraught with danger — to your equipment, to your business and to your wallet. When in doubt, don’t mix different lubricants.

To this day, DuPont claims that "PTFE is not useful as an ingredient in oil additives or oils used for internal combustion engines." The NASA Lewis Research Center conducted a study in which oil additives containing PTFE were tested. The conclusions of this test were as follows: "In the types of bearing surface contact we have looked at, we have seen no benefit. In some cases we have seen detrimental effect. The solids in the oil tend to accumulate at the inlets and act as a dam, which simply blocks the oil from entering. Instead of helping, it is actually depriving parts of the lubricant."

Aside from PTFE, many of these products contain a base oil, zinc, phosphorous and sulfur compounds. It should come as no surprise that this is exactly what the oil manufacturer has already put into the oil. The only difference is that when the oil manufacturer adds compounds, it is in very precise quantities, at specific temperatures and in a certain way to give the end lubricant very unique performance properties.

Think of the lubricant as a chemical soup with very specific characteristics. Mixing additional ingredients into the soup will have an effect on the outcome of the recipe. How often do you walk into a world-famous chef’s kitchen and toss in a handful of what you think it needs, not knowing what was in the soup in the first place?

Other important questions to ask before using an engine oil fortifier would include why are there so many Federal Trade Commission fines and lawsuits against the aftermarket additive companies for misleading advertising, why don’t car manufacturers recommend their usage?

nickding1220 wrote:
最近回原廠第一次保養，因為某些因素怕技師給我加錯混油，想請問如果是同品牌同番數，但半合成跟全合成或是都是全合成但機油檔次不同可以混用嗎?

你說你害怕在愛中迷途 wrote:
10W40 + 10W50 = 10W45
真的有人這樣玩