Question. What is “detergent” in oil? Can it affect rubber parts? Is it like detergent for washing dishes?
Answer. Detergents are a necessary part of modern oils. They reduce sludge build up, keep oil passages clean and help your oil filter do a better job. Lubricating oil detergents are specially formulated for oils, and have totally different chemistry than cleaning detergents. Detergents found in modern oils will have no effect on rubber parts.
Question. Do Spectro Oils have a shelf life? I’ve had a new quart in a never opened plastic quart bottle in my shed for about 6 or 7 years. The shed is in a location with hot summers and cold winters. Can I use it?
Answer. As long as the bottle is sealed, the oil shelf life will be 10+ years. It won’t be affected by changes in temperature while in storage.
Question. I have a 2007 Harley-Davidson Ultra Classic Electra Glide motorcycle. 44,000 miles. My transmission final drive bearing is making noise. 2007 is the first year of the 6 speed for this model. I have used your 75w140 since it was brand new. I change it every 10,000 miles. The book calls for a change at 20,000. This motorcycle is 100% stock and is not hot-rodded (it’s a Harley). Mostly highway miles. Is this oil to heavy? Have you heard of issues with this transmission.? Is 10,000 miles between changes too long? Is there a better fix for this than the Motor Co.?
Answer. You are correct, there have been many bearing failures in the early 6-speed transmissions. A Google search or a search of HD message boards and forums will provide some solutions. There are several factors that cause the bearing to fail, none of them are lubrication related. If your bike is equipped with the automatic primary chain tension adjustor, they have been known to over-tighten the primary chain, causing excessive bearing load which leads to failure. Several companies make an aftermarket manual chain adjustor. I’m familiar with the Baker version, it works very well. Here is a link with more info, there are many more like this. Touring Models Transmission Bearing Failure. 75w140 is the correct weight to use with the 6-speed. We recommend changing at 10,000 miles or once a year, whichever comes first.