General Faq

When should I use synthetic gear oils?

Synthetic gear oil should be used when mineral oils can no longer provide protection at high or low temperature extremes, or under very high loads. Synthetic gear oils provide outstanding thermal stability and offer protection under a wide temperature range (204.4 degrees C to -40ºC).

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How do I know which gear oil to use?

Follow the manufacturers recommended viscosity grade and GL rating.

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Can I use Minute Mend™ to repair a leak in my automobile’s gas tank?

No.

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Can I use Di-Electric grease to seal and lubricate battery terminals and spark plugs?

Yes.

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Why is it recommended that I clean out any old grease before applying new grease?

Not all greases are compatible. Incompatibility of greases may result in a component failure as a result of significant changes in the chemical and physical properties of the grease.

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What does “viscosity grade” and “GL rating” mean?

The Society of Automotive Engineers (SAE) has designated a grading system that classifies gear oils by their viscosity. Normally, oils are graded at one temperature (usually 100° C). Winter oils are also graded at -18° C. When the oil is graded at the lower temperature it is given the suffix “W” (i.e. 80W). Many oils are formulated to meet the requirements of more than one classification. Multi-grade oils are designated by two grade numbers such as 80W90. This number indicates the oils lowest and highest grading. While viscosity is important, the American Petroleum Institute (API) classification is critical in determining proper gear oil. The API has classified gear lubes (GL) into several categories based on applications, properties and additives. The classifications are GL-1, GL-2, GL-3, GL-4, GL-5 and GL-5* (GL-6 has been replaced by GL-5*). Vehicle and equipment manufacturers have specific gear oil requirements and viscosity grades. This information should be specified on the gear case or in the service manual.

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How often should I change my gear oil?

Follow the manufacturers suggested change intervals. Additionally, if work or repairs are being done to the gear case, it is a good time to change the gear oil. Also, if the last oil change is unknown, as in the case of a used vehicle, it is a good idea to replace the fluids. Remember, you can never change gear oil (or any fluid) too often.

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Why are there so many greases to choose from?

Depending upon the application, different greases, additive packages, and NLGI grades may be required. When in doubt about which grease to use, contact Technical Service and we will assist you in making a selection.

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Does CRC offer a water based silicone?

Yes, Part #03035 – CRC Water Based Silicone, which is NSF H1 Registered.

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Do the CRC silicone products contain petroleum?

CRC silicone products don’t actually contain petroleum, but they do have solvents that help deposit the silicone onto the surface that requires lubrication. Most of the solvents are manufactured using petroleum precursors.

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Are 2-26® and 3-36® the same?

No. They are both multi-purpose lubricants, however, 2-26® is plastic safe and 3-36 is not.

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