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Q. Does Citgo have a high zinc motor oil that would work well in older flat tappet engines?

A. If you are using the older gasoline engine for normal operating conditions, a diesel engine oil type formulation does typically provide higher Zinc levels an...

Q. Mark I have an older fleet 1998 to 2007 what oil should I run?

A. Diesel heavy duty engine oils that meet the current American Petroleum Performance Category CJ-4 are backward compatible with older engines such as yours.

Q. Is one synthetic oil better than the other?

A. Your question regarding the products you have referenced need to be directed to those companies to support their claims. However, there can be a difference i...

Q. I am wondering if you can tell me what the estimated miles per gallon are for a truck using the CITGARD®SynDurance® 5W-40?

A. Typically the range has been from 1-3% depending on type of fleet. With current diesel fuel prices that can yield an annual savings of up to $1500 or more an...

Q. What type of lubrication do today's automated manual transmissions need?

A. Manual automated generally utilize the same type of drive line lubricant as manual transmissions.

Q. Do natural gas engines need different engine oil?

A. If the natural gas engine is spark ignition and operates totally on compressed or liquefied natural gas, major engine manufacturers recommend a natural gas e...

Q. Can I use the same engine oil in my gasoline and diesel powered vehicles?

A. Even though many if not most heavy duty engine oils claim both the API C or commercial performance category for diesel and S or service category for gasoline...

Q. Will it hurt my engine if I don't use the same brand of oil every time?

A. No, the engine does not develop an affinity for one oil or have a negative reaction to changing brands.

Q. What's the correct way to grease a fifth wheel?

A. Good question and an area that is most often neglected or done incorrectly. Many truck 5th wheels are re-lubricated by simply taking the grease dispensing un...

Q. What's the difference between TBN and TAN in an oil analysis?

A. TBN is total base number and TAN is total acid number. TBN is a measure of the reserve alkalinity or reserve acid neutralization remaining in the oil.

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