Diesel engine oil in 4 stoke motorcycle engine?

You didn't ask, but someone offered bad information anyway ~ Energy Conserving oil (EC) absolutely will not do anything harmful to a motorcycle engine. No commercially available oil (meaning anything you can buy off the shell at any gas station, auto parts store or discount store like Walmart) will hurt the engine in any way. EC oil will show clutch wear (slipping) earlier than non-EC oils, but the clutch will wear on its own regardless of the oil. If your clutch slips and you have EC oil in the bike, draining and filling it with non-EC oil will 100% resolve the situation for the time being. Just know that within a few thousand miles (5~10k is what I've found personally), you're going to be replacing the clutch.

So, the short of it. No oil you can buy will hurt a motorcycle engine, Period. Similarly, no oil you buy will do anything GOOD for the engine either. There May be some slight advantage for different climates/temperatures or for air-cooled engines (mostly in the longevity department), but if you're not doing extended oil change intervals, it's a non-issue.

I use Mobil 1 5w40 because my diesel car calls for it, my truck calls for it and I only like to buy one oil for everything.

Because of the soot in diesel motors the oil has a lot of detergent additives to keep this from clogging things up. In a used petrol car engine this will lift any deposits of the internals and hopefully drop them in the filter. A m/c engine generally only has a strainer so the rubbish will circulate until the oil change and that may not be good on a long term basis. On the other hand any oil is better than low oil, and the diesel variety may make a worn engine quieter as the thickness is greater. I ran a Norton ES2 with EP90 gear oil for a few miles once as I had no other available after a major leak had emptied it. No problems later.

Oil formulated for Diesel engines still has a lot of the beneficial additives in it that had to be removed from oil meant for catalytic converter equipped cars. It is common knowledge among bike enthusiasts that Oil such as Shell Rotella T is a preferred choice because of this. Look up zink as an additive in motor oil and it's benefit in an air cooled engine.

Don't put anything with the word

DIESEL in it, anywhere near your bike.

It will cost you a fortune for a new engine! Just don't skip about and do things on the cheap.

Being a girl I don't know much about engines and stuff but I know that a bike engine will get a lot hotter than a car engine and I feel sure this diesel oil will burn and stick to whatever it goes through!

Hope that's a bit helpfull

I forgot to say, Jesus wont help you if it all blows up! :>)

I have heard this a lot and I treat it like an urban myth. What failures in motorcycle oil is diesel engine oil supposed to be addressing? I don't know why an oil formulated for a sooty, super-high compression slow turning engine would be better than an oil formulated specifically for a motorcycle. I doubt it's going to hurt anything, but what's the point? I have been riding for 25 years. I have almost always used conventional motorcycle specific oil in the grade my manual recommended. I have never had a oil related failure in any of my motorcycles.

Regardless of whether it's certified for diesel use or not (and it is), Rotella T6 dino and T6 synthetic are both also certified JASO MA (motorcycle, wet clutch) and THAT is what is important...

T6 is quality oil, no better or worse than a lot of others... BUT it is relatively cheap and conveniently available at Walmart so many of us use it in our bikes and quads and have nothing but good things to say about it.

I wouldn't use just ANY diesel oil, just as I wouldn't use ANY standard automotive oil - the JASO MA guarantees that it has no additives that can damage your clutch.

The additives in any oil meant for cars will wreck the wet multiplate clutch in nearly all bikes. It contains friction modifiers that motorcycle engine oil does not need or want. Only a few like the BMW boxer twins have a dry clutch

I have been using Rotella 15w-40 in my Yamaha WR for a while, its amazing I've had nothing but good things to say about it. Its good oil and when you change oil as much as I do, 12.00 a gallon is a lot better than Bel-rays $30, I can afford to ride more and change my oil as often as possible.

Also, JASO-MA approves of it, and if you want serious information about it beyond the scope of an average persons understanding check out www.BobIsTheOilGuy.com he did serious research on the oil.

Clean oil, more often is better imo.