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Oil & Lubricant Technical Articles
Article
Difference in application between API GL-4 and GL-5 transmission oils
19 September 2013
Question: It is very common to assume that all GL-5 oils are an improvement over the GL-4 oils and can completely replace them. But is this the case?
MITASU OIL expert help: This statement is true only in part, because the API classification categorises gear oils depending on the content of anti-wear, anti-scoring and other additives in its formula and depending on its rating for EP (Extreme Pressure) protection. API classification does not provide the separate rating for synchromesh transmissions, which demand an additional requirement for compatibility of oil with non-ferrous metals. GL-5 oil may well replace the GL-4 product in a cross-axle differential (in the speed reduction unit or in the axle), and at the same time, prove to be unsuitable for the manual (including sequential) or synchromesh transmissions.
Poly-Alpha-Olefins (PAO)
22 june 2011
Question: Why poly-alpha-olefins are true 100% synthetic?
MITASU OIL expert opinion: To understand variety and classifications of motor oil it is worth noting that any motor oil consists of two main ingredients: one type or blended mixture base stock, combined with a unique system of enhancing additives (performance additives). There are four different types of base stock used for motor oil production: mineral oil of Groups I and II and oil of Groups III and IV. Group III is marked as "synthetic base stocks" although they may be derived from natural products by highest level of refining. Group IV base oils are poly-alpha-olefins (PAO) - chemically engineered synthetic base stocks.
Mitasu grease
16 August 2012
Question: What do we use grease for?
MITASU OIL expert help: The range of grease application is very broad. It is used for:
- Reducing friction between friction surfaces;
- Reducing wear and preventing scuffing (scoring) of friction surfaces;
- Protecting metals from corrosive environments;
- Sealing gaps between mating components.
Moreover, grease can protect the friction components against load shocks, reduce vibration and noise level and act as insulating materials.
History of the Performance Standards
21 june 2011
Packaging and labelling of motor oils contains a vast variety of abbreviations. In addition to commonly used SAE API (SM 10W-30 for instance) there are also such abbreviations and acronyms as ILSAC, JASO, GF-5, GF-4. Some companies even still use the outdated GF-3 & GF-2 standards. Let's have a close look at these standards, the organisations in charge of setting them up and how these standards affect the characteristics of the motor oil used in your vehicle. Prior to 1992 there were only three organisations (known as tripartite system) that set standards for oil quality and performance, and classified oils for passenger cars, light trucks and commercial vehicles.
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