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I've been scratching my head over this for a few months. Not that I really expect anyone to know--maybe the tribologists might. If bevel gears need GL-4, and the 750 Honda Shadow has a bevel gear final drive, then why do they ask for hypoid gear oil which requires GL-5? Not hard at all to...

Looking at a sprocket change with the next chain replacement on my bike. I am looking at two options that offer darn close to the same drive ratio: 17 tooth front sprocket with a 47 tooth rear sprocket 16 tooth front sprocket with a 44 tooth rear sprocket I recognize that there are chain...

The SAE J306 can help highlight the definition for maximum cold weather viscosity. As I understand it, transmissions and differentials bear lubricants acting in the boundary lubrication regime. Assuming there are no pumps, clutch plates, or synchronizers for these systems, of what engineering...

I am looking to know if a typical UTTF fluid is friction modified to work appropriately on kevlar clutches. Are there any specs that I should look for where this is tested, or the intended service?

I stumbled into this patent that describes the formulation/design of a firearms cleaner. Just wanted to spread and share with the forum, just in case anyone might be like me and enjoy reading these every so often. patent US20070010414A1 Composition and Method for Cleaning Firearms Abstract The...

I have read that the Calcium Sulfonate thickener can also behave as a corrosion inhibitor. Can other soaps behave as corrosion inhibitors?

Does anyone have any papers or studies that might describe effects of adding FAME or FAEE to gasoline? Typically these come from unsaturated feedstock fats, with the majority high in alkyl length (18+). What about FAME or FAEE derived from saturated, short-chain triglycerides or medium-chain...

With polyurea being a considerably polar family of compounds, the greases made using this thickener must have an additive package that is better tailored with this in mind. What kind of changes are made, or what does a polyurea additive package look like in contrast to, say, a lithium complex or...

Okay, I've got a weird one. For a product like Vaseline petroleum jelly, where in the stream of refining (solvent refined, hydrotreated, hydrocracked) does a product like this typically come from, and why? Are there limitations to it containing aromatics, such that it couldn't have a significant...

How do ashless dispersants compare to overbased metallic sulfonates with respect to piston cleanliness in gas engines? Are they leveraged for long-life formulations that are low SAPS, or do formulations err on choosing a more oxidation resistant base oil?

Every other year or so, some friends of mine go on a ski trip. I remember trying to dig up tribology regarding ski wax three years ago, before I was active on this site. I had a hard time finding much at the time. I was curious about anything y'all may know regarding this niche area. I haven't...

Chevron lists the 400 SDE and 400 XLE as both meeting "MTU category" 2.1 and 3.1, respectively. 1. Going through the Afton Handbook, does this mean that it meets MTU MTL 5044, for multigrade "1 to 3" or "3.1"? 2. If so, there is a seemingly stringent FZG test it must meet. Does anyone know how...

All right, I've got a question. A bit of background: Yamaha makes a side-by-side called a YXZ1000r. The machine has a split sump between the transmission and engine: they don't share the same oil. The transmission is a sequential dog box transmission with a wet clutch. Yamaha just states to use...

I can't find anything in spec sheets to characterize greases relative to others or competition regarding their ash content as you would with a motor oil. What kind of number could one expect if there was such an analysis? I understand that most metal-soap thickener based greases would contain...

This may seem weird, but I had a question regarding whether or not I'm interpreting this right: Mobil reports that 1. the HTHS for Delvac 1 ESP 5W-40 is 3.8 2. This fluid meets VDS 4.5 https://www.mobil.com/en/lubricants...cants/products/mobil-delvac-1-esp-5w-40/ I looked up the VDS 4.5 spec...

So, I am mulling over the SDS for Liquid Wrench's Penetrating Oil, and I decide to see what CAS "1581740-29-5" leads to, but no dice. I instead lookup the constituent hydrocarbon to see if it has particular uses. Thats: 1,6,10-dodecatriene 7,11-dimethyl-3-methylene-, (6e)-, Hydrotreated What...

Is there any way to find out what a stock car's oil pump bypass pressure is? (without doing it experimentally with a sensor) Shouldn't they be something like 80 psi?

I've been looking around a little and I can't seem to find other HDEO in 15w40 that meets the 228.51 spec. What other options do you guys know of that aren't too boutique?

Hey all, If a GDI engine has fuel dilution, would most people regard that as something driven by: -Poor piston rings, with the injection system behaving at its prime, just tend to let fuel pass. -Direct injection systems, even when operating at their prime, will (with few exceptions, if any)...