El naturale from the beginning to the end. Unless we run out of dino!

 

A 4200 mile run won't need an oil change part-way through.....its grinding around town that kills your oil....I go 5,000 - 6,000 miles between changes....with modern mineral (Dino) oil you can go even more than that quite safely...no wonder the USA is sucking the world dry of oil....you guys are just throwing it away!!!!

Synthetic oil has always been the Houdini of motor parts, it seeks and it escapes, that is why you don't wanna use it in Evos and why it would not stay inside a Shovel or a Pan long enough to lubricate anything ;-)

 

Kinda hate to say this, but my Harley has the only motor that's leaked with synthetic out of a variety of metrics and cages I've used it in. Kind of a shame, got better gas mileage on everything else, and higher top speeds on a couple dirt bikes, but syn doesn't seem to do much for my Harley. And yeah, got a couple leaks to fix when I put it on the jack for a tire change change soon. May go back to dino on the next oil change, even though I think it was age, not oil, most likely for the leaks.

 

On my 05 WGlide, about 20 k switched from dino to synthetic. at 25k did oil change still synthetic about 26k the leaks started on the top end kept getting worse and worse. finally found a set of Orings for the damn thing after a year of looking, but before i put them on, i decided to switch back too dino to check a rumor about how syn. oil cleans to much. the leaks stopped with the dino oil. it was about 3 weeks and they just stopped. my $.02 on my experiance. results may vary, but dino oil is what i'll run. my 3 quarts a year isn't going to run the world reserves dry.

 

Total bullshit. Bought a 1988 FXLR with Spectro in it,never looked back. Most oil-tight bike I've owned.

 

I got the rear cylinder base gasket leak after changing to synthetic. I doesn't leak enough to bother with fixing it.

 

If any of you really believe that synthtetic does push out of tighter clearances and makes some bikes leak, well, you are plain silly lol

 

Got exactly the same problem on my 93 decker after 10 - 15k miles on mobil 1 20W50 - rear base gasket leak.
Now back to Valvoline (that's what mineral hd actually used to be - right?), will see if the leak stops

 

I feel strongly about using Dino and just don't give it time to break down. That synth stuff is almost tooo slippery.

 

Yep; my 99 EVO had Castrol GTX 20-50 dino in it up until it had 20,000 miles on it. I changed to Mobil-1 VTwin 20-50 and within 500 miles it started weeping oil from the rear cyl. base gasket. I changed it back to dino, and I now have 34,000 on it with no leaks. Two things I have learned from friends. Always warm up an EVO before riding it. Always use dino oil if you don't want leaks. If you don't mind oil squriting out here and there, do what you want.