Royal Manufacturing - Industrial Greases and Lubrication

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Contact Info:

Tulsa Plant
516 S. 25th West Ave.
Tulsa, OK 74127 USA
918.584.2671 918.592.6472
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Schertz Plant
(San Antonio Metro)
9998 Doerr Lane
Schertz, TX 78154 USA
210.651.7322 210.651.7405
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Ask The Expert

Needing answers? Looking for live technical support? Having an issue with your products? Let our problem solving experts handle your toughest issues. Ask our panel of lubricant experts about your oil and grease questions. Email us at or click the link below to fill out a brief questionnaire that will help us answer your questions in a timely fashion.




Ask the Expert – FAQ

Q: What viscosity motor oil should I use in my engine?
A: Royal suggests following your recommended motor oil viscosity and maintenance schedule provided in your vehicles owner manual. 

Q: What is API?
A: The API (American Petroleum Institute) is a national trade association that represents all aspects of the oil and natural gas industry. We do not recommend using any motor oils not registered with the API.

Q: What does the “W” in a grade of oil mean?
A: The “W” in motor oil stands for the cold temperature pumpability of the oil. Example: 5W20 multi-grade motor oil means it can operate like a 5 weight oil in colder climates and a 20 weight oil in warmer climates.

Q: What is SAE?
A: Society of Automotive Engineers coordinates the development of technical standards for the automotive industry.

Q: Synthetic oil vs. mineral oil?
A: Synthetic oils are produced in a laboratory under a process that takes very small molecules and bonds them together to form larger molecules which enhances the properties of the oil. Mineral oils are refined crude oil through various hydro refined/hydro cracking processes that separates unwanted properties to form a finished product suitable for use.

Q: Is switching motor oils (mineral, synthetic) harmful to my engine?
A: Mineral, synthetic blends and full synthetic motor oils are compatible and will not harm your vehicles engine.

Q: What is the NLGI?
A: The NLGI stands for the National Lubricating Grease Institute and is an international organization that serves the lubricating grease industry.

Q: What does NLGI consistency number (grade) for grease mean?
A: The most common NLGI grade of grease is a #2 grade grease. These grades determine how thick or thin a grease is based on an ASTM D4950 test for penetration, at X60 strokes, at 25°C and range from #000 (fluid) to #6 (brick).

Q: How much of a difference is there from lithium to lithium complex to aluminum complex regarding (EP) extreme pressure performance as well as friction reduction and water washout?

A: All three can be additized to improve EP performance as well as friction reduction.  Be aware that lithium greases do not have the resistance to heat that either of the complex greases would.  Water washout is another story.  Aluminum complex has long been praised for its resistance to water.  It is usually far more resistant to water than either lithium or lithium complex.

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