I use Mobil one 15w50 synthetic in my engine. I'm told it's not necessary to get the special "v-twin" oil that they sell. I've had it in mine since new and lots of guys use it. Got almost 8,000 miles already (been 9 months) and no problem. I use 75w140 syn in the trans and plain jane 10w40 in the primary. Ride on!

 

OK, I'll be the odd man out: conventional - all 3 holes.

 

Not to debate as I don't care what others use, but to set the record straight. Mobil 1 V Twin 20/50 for the engine is better. Some people use the regular Mobil 1 car oil but it lacks the necessary additive packages (one being moly that is an anti wear agent) to stand up to the heat of the Harley air cooled engine which runs much hotter than the car counterpart because of the water cooling. Regular may be adequate, but there is a difference. It is worth it to me, but then to each his own.

 

Amsoil, all three holes.

 

Might want to check that bit about the moly. Take a little trip to the BITOG website and look at the virgin oil analyses. Additive packages for the Mobil 1 V-Twin 20w-50 and Mobil 1 15w-50 car oil are very similar.

 

On the newer twin cams there are small holes that spray a fine mist onto the underside of the pistons. It helps cool the engine. A full synthetic is going to keep those small openings flowing oil. I do not use Mobile 1 but would highly recommend the V twin specific oil. Nearly the same sometimes is the same as not quite right. For a few extra dollars you get the best that company has to offer.

 

An old Harley mechanic asked me once: "do you want to get 50,000 miles or do you want to get 100,000 miles out of your motor?" The choice was easy for me.

 

Thanks for all the info, I think i'll be changing to synthetic form all the input.
again thanks

Soggy

 

it's all up to you,syn you can run more miles on the oil than dino.i wonder why H-D is still selling 360 oil? i ran both never had a problem either way.my old 06 88" it was so f/n hot i ran mobil1/lucas.so far with my 08 96" that is no way near as hot i run 20-50w dino oil and will change it very 2500 miles on my old 04 88" ran dino all the time.

 

Syn vs. dino?