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I have a good buddy that has 300,000+ miles on a toyota pickup that's ran Castrol all it's life.
Haven't looked into the stuff myself so I know little about it.
HD Syn3 is probably a pretty good oil, but it is made by the lowest bider for HD. Amsoil, Mobil, Redline, Royal Purple and many others are in the business of making lubrication products. There are many good synthetic oils out there and Syn 3 is probably in the lower half of the bunch. Having said that you can probably run Syn 3 and have no problems at all.
Pick one you like and that is easy to get a hold of and then ignore the rest of the oils threads you see. Mobil 1 15-50 is a great oil for the engine and is available at walmart and other auto parts stores.
So when people are arguing for their favorite oil, and mention such a ridiculous argument as to "show me proof", they lose the argument before they even hit the "submit" button (as far as I am concerned).
You're absolutely right Ed, wanting proof of an outrageous claim (Amsoil = possible engine failure) is pretty ridiculous because as we all know, nothing is more definitive than speculation and hearsay.
Who uses this? I just bought a brand new ultra classic and had my 1k. I have some friends who swear by this oil? What's the main differences between this and the regular synthetic they put in at the dealer?
Besides price, I can't tell the difference between Amsoil and Mobil1. I switched to Mobil1 15W-50 and the bike runs as good, even a little quieter.
Make sure it's a motorcycle 20W50 oil and not 15W50 automotive oil !!
Using automotive oil in a motorcycle wet clutch is not recommended........ever..... !!
Mobil1 15W-50 works great in my engine. I also have it in my primary now as an experiment and there's no slippage whatsoever. I'll switch to Mobil1 20W-50 in the primary as a precaution but I don't think it's necessary.
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