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post #1 of 8 (permalink) Old 05-26-2014, 02:19 AM Thread Starter
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Mobil 20-50 for cars

A few years ago when I had my Stratoliner, I threw in some Mobil 20-50 for cars. This was the syn. stuff. I got it at WalMart, 17 bucks for a 5 qt. jug.
It actually was JASO rated. I never had a cooler running engine and that one had 113 CID. My clutch worked great, but then the dealer found out about it and all hell broke loose, mainly he was freaking out about the clutch. He may have had a point because that one had all the oils in one pan.

So now today, the HD keeps thing seperate, do you see any probs running this in my engine? I know they make a Vtwin specific oil, used it, like it, but it just is not as cool as that car oil. Nothing else has been.

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post #2 of 8 (permalink) Old 05-26-2014, 03:03 AM
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nothing wrong with car oil at all many peeps do it , I ran the Mobil 1 20-50 full syn car oil for years with no issues

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post #3 of 8 (permalink) Old 05-26-2014, 07:10 AM
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I've wondered about this myself. I see deals on the Mobil1 synthetic car oil all the time. Their Vtwin oil is always $10 or more per qt. Everyone runs specials on the car oil. I always thought the "motorcycle" blends had something specific for the Vtwins. Ivery always used the HD syn3 which is between $9 and $13 per qt

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post #4 of 8 (permalink) Old 05-26-2014, 07:15 AM
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No comment on the oil choice but do not expect your Harley to run as cool as the Yamaha by changing oil. Yamaha runs much lower compression and low tension rings on plated aluminum cylinders. At Myrtle Beach my brother's Road Star never got near as hot as my Harley in traffic.


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post #5 of 8 (permalink) Old 05-26-2014, 07:51 AM
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The car oil is actually 15-50, but yes, I'm running it my 103, have since its first oil change and intend to continue. I ran it in my last 2 twin cams also.

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post #6 of 8 (permalink) Old 05-26-2014, 09:50 AM
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I would think that the only difference between the car oil and the bike oil would be the friction modifiers.
If I went that route I would use a full synthetic diesel oil such as Shell Rotella T 5w40 full synthetic. I know the viscosity is down a bit but diesel oil will not break down like motor oil for cars.
That is why HD recommends diesel oil if you can not find MC oil.


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post #7 of 8 (permalink) Old 05-26-2014, 10:04 AM
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Quote:
Originally Posted by ironmark View Post
I would think that the only difference between the car oil and the bike oil would be the friction modifiers.
If I went that route I would use a full synthetic diesel oil such as Shell Rotella T 5w40 full synthetic. I know the viscosity is down a bit but diesel oil will not break down like motor oil for cars.
That is why HD recommends diesel oil if you can not find MC oil.

Absolutely correct. Diesel oil starts out with the same base as gas oils but then add a much more robust additive package than gas oils.

Not all gas oils have friction modifiers and for what it's worth, they don't do to clutches these days what they did to clutches in the 90's. The friction modifiers have changed and don't cause slippage. I know 4308272195389253 people will think "That's not what I've heard" . Kind of like, "You can't go from synthetic back to conventional" Not correct statements. Rotella is a robust, well refined and competent oil.
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post #8 of 8 (permalink) Old 05-29-2014, 11:29 AM
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Quote:
Originally Posted by JacktheBagger View Post
nothing wrong with car oil at all many peeps do it , I ran the Mobil 1 20-50 full syn car oil for years with no issues

JtB
+1 been using mobil 1 in my EVO engine for +12 years.


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