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This forum has much more traffic than the motorcycle forum, and it is a rather general question so I would like to ask the "experts" browsing this forum something... Someone who isn't me accidentally used Redline 50 weight race oil in their 250cc engine that is purposely jetted lean. It is...

What is the target pH of the used oil supposed to be when TBN approaches 0? Would this be something the manufacturer would be able to specify to me? What does the ASTM D4739 specify for an end result? I can do potentiometric titration without too much difficulty in my local laboratory. I am...

Hello, This subforum gets the most attention so I figure by posting here I have the largest user exposure. This is a rather general question that might be extrapolated to other engines as well so it is not off-topic. I have a 250cc four stroke, liquid cooled engine with a 15,000 rpm red line...

I have some gear oil that didn't fit in my car. Can I use Redline 75w90 GL-5 hypoid gear oil in the final drive of my 07 Yamaha C3 moped final drive that specs 10w30 hypoid gear oil?

What is the best oil filter for my Kawasaki Ninja 250R? Some Hondas also share its form factor and I use a Honda brand filter right now that I change every 6000 miles. Are there any better filters on the market? Particulate matter in wet clutch setups bothers me a lot. Thanks.

I am thinking of putting my cylinder head and oil pan in a strong solvent bath overnight to dissolve the pretty bad sludge I have in there. My questions are: 1) What is the best solvent to use for this? 2) What parts need to be re-lubricated with assembly grease before I reinstall it? Do...

I have a 2001 Kawasaki Ninja EX250. These bikes have engines that wear out relatively quickly due to their high revving nature. My redline tops out at 14,500 rpm. However, I once did the math and these engines actually last as long as a good car's engine in terms of revolutions. My engine is...

I scoured the forums and could not find a thread that specifically addresses this question. If someone does find pertinent information that has already been discussed then I ask the mods to point me in the right direction and delete this thread: I would like some thoughts on the differences in...

I recently bought a BMW 323i and replaced all the fluids in the car. As I was going through the oil though, I decided to give it a kerosene flush and then changed the oil. This new oil I ran was Napa 15w-40 Diesel oil and I put in a whole bottle of Auto-RX and ran it for 3000 miles. At the end...

I have a 2001 Mercury Sable LS Premium with the 3.0L Duratec (more like Failtec) engine. I have owned this car since new and have religiously changed the oil every 5000 miles with Mobil 1 5w-30 and the cams look as clean as ever from peeking inside the valve cover. No pitting and almost no...