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[hun]

I am sorry if my topic was already discussed but i did not find anything regarding..
1 which oil is better for m8 121 amsoil or red line?
2 is it possible to put amsoil in the motor and red line in the primary and transmission?

many thanks

[HD Street Performance]

The two are both high quality oils. Vtwin 20-50 for engine, MTL or Primary oil, and Redline Vtwin Transmission with Shockproof

[hun]

yes i understand but can i use them combined or only one brand?combined meaning one brand for motor and the other brand for primary and transmission?
thank you

[kojak]

combined meaning one brand for motor and the other brand for primary and transmission?
thank you

Lots of riders do just that and swear by it. Personally, I prefer using Syn3 in all 3 holes. Works just fine for me.

[hun]

no possibilities bo buy syn3 here.on amazon can not find amsoil primary and transmission.that's why i'm asking

[HOGMIKE]

See reply #1…

There are lots of comments on oils.
One of my club members only uses the cheapest Walmart 20-50 engine oil for all 3 holes and his stock bike runs just fine.

My personal bikes run Mobile 1 v-twin 20-50 in the engine, redline in the transmission and HD in the primary (I have to shop at the HD sometimes due to these gift cards).
 This combo works for me and the engine parts shows minimal wear after many miles.

JMHO

[HD Street Performance]

Of course mix brands if you can't get all the same. Mobile 1 is also very good oil. Lots of room at the top for good oils. Engine oil I prefer a full synthetic.

[ultra13]

If you travel like we do I like Syn3 because you can take 1 qt for any hole that needs topped off for any reason. Lots of other good oils out there to.

[HD Street Performance]

Back in the day Harley had issues with all three holes and syn3. I replaced a lot of trans bearings. There are reasons but it is not necessary to clutter up the bandwidth with oil opinions. The summary is motor oil does not have EP additives and a detergent package that is not suited to the transmission or primary, not a statement about the oil itself or the brand. The compensator has also proven, over the years, to be in need of quality lubrication which is why I recommend changing every engine oil change and that at intervals of 3000 miles. The Shockproof has higher viscosity than Harley Formula and slows the gears down faster with clutch in so easier to find neutral. Harley Heavy Gear Oil is same viscosity as Shockproof Heavy.

[r0de_runr]

Yes you can mix different brands in different holes.
You can even mix different brands engine oil as long as it is pretty much the same grade and type: 20/50 Synthetic with 20/50 Synthetic.
But your best bet is right viscosity for your climate...and engine oil in engine every 5k miles.  Primary oil in primary every 10k miles, and transmission oil in transmission every 20k miles. Or more frequently if you ride really hard, or in really hot climates, or take really short trips -or just like throwing money at your bike.

[HD Street Performance]

Just a point of information, Harley has changed their recommended oil to 15w/50 Syn3 from the previous 20w/50 for similar temperatures.

Their claims for the new Syn 3:

• Strength of an SAE 50 and the broad protection range of an SAE 15W-50
• Superior shear stability - 87% improvement over original SYN3
• Extreme high temp stability - 20% improvement over original SYN3
• Improved cold starting and low-temperature operating protection
• Backward compatibility to all H-D models that use SAE 20W-50 oil

Not an endorsement just their advertising literature.

[FLSTFI Dave]

Interesting claims.

[Cvostu]

I use amsoil.   Motor transmission. And primary.   No issues ever.  Nice and quiet too. 

[r0de_runr]

Just a point of information, Harley has changed their recommended oil to 15w/50 Syn3 from the previous 20w/50 for similar temperatures.

Their claims for the new Syn 3:

• Strength of an SAE 50 and the broad protection range of an SAE 15W-50
• Superior shear stability - 87% improvement over original SYN3
• Extreme high temp stability - 20% improvement over original SYN3
• Improved cold starting and low-temperature operating protection
• Backward compatibility to all H-D models that use SAE 20W-50 oil

Not an endorsement just their advertising literature.

I just wonder if they now have a contract to get their oil from Mobil1 (the 15w50 many use).  It's pretty cheap for us to buy, sometimes like $5/qt if you buy 5qt jug. so HD's markup would be incredible. Probably $2.00/qt wholesale and HD sells it for $23.99/qt!!!!!

[HD Street Performance]

The dirty truth is there are MANY best choices. M1 has always been a good choice and is reasonable. Can be important also, is featured at most walmarts across the country, in other words very available.