Different weights of oil ok?  By  kxj5906 (Read 3,488 times)

Yeah I figured using different oils would cause a mess. I typed in the question using Google but there were a lot of answers that said it didn't matter if you use different types of oil together.. Hmmm

mixing oils can't harm at all.
In fact Mobil is one of the leaders on oil, says it themselves on their website, and who goes against the knowledge of a big company, who has been in the oil business for many decades, like theirs?

Anyway, no harm done in mixing, but your oil is too heavy for your scoot.
Depending on how many miles you have on the scoot, you should not go higher than 15W40.
Reasonably new scoots, with less than 10k Miles on them should do with anywhere between 5W30 and 10W40 (that includes 10W30, 5W40, or any mix in between).

You really mixed the heaviest oils. If you had put 3/4th of 20W50 in there, I would say, add the remaining oil with 0W20, and it would be ok.

Now I'd have to agree with above poster, redo the oil change.

You could capture the oil, put it in a bottle, fill your scoot with 50% of that oil you just captured,
and buy a bottle of anywhere between 0W20 and 5W30 and add it to the oil you have in there.
Mixing 0W20 with 20W50 in a 50/50 ratio should give you 10W45, which is rather on the thick side, but should work.

diesel engines and old harleys with 75-100k miles on (or more) use 20W50

Unsure if diff viscosities would mix or separate . Diff oil companies use diff detergents and other additives so mixing can be bad and not suggested . You should be fine with any automotive oil as scooters do not hit high RPMs like a crotch rocket does , which for those I would use a motorcycle oil like Motul or Bel Ray since of the higher RPMs .

I was amazed after I first read about mixing boric acid with engine oil as there is lots of info all over the internet on it even at www.epa.gov ( it was unsure if still is there ) . I read where some mixed BA with a full synthetic oil on a wet starter clucth like I have it and it would slip rather than engage . Even my scooter dealer had to drain it after doing this since it would not start . I used Castrol Synblend instead of a full synthetic but I let it get hot before and after doing this and had no problems . It seem to idle quieter .

When I was young I had a Geo Metro that called for 10 w30 . Since it had lots of miles I used 10w40 no problems . I tried 20w50 and it hurt my MPG as was too thick for the oil pump and the oil passages . Drained it and put in 10w40 and it was good again .

Older cars used 10w40 , then many went to 10w30 as clearances got smaller . Many new cars use 5w20 . BMW and Mercedes us 20w50 since the oil passages are bigger than most other cars . I serviced a Porsche 911 Turbo that also used 20w50 and was oil cooled with a huge oil cooler ( they later went LC with antifreeze ) and it is the only car I know that you check the oil level with the engine at idle .

www.cyclegear.com has a great selection oils but expect to pay extra for Motul

About the additives used in oil, they are not a problem. Most oils have similar amounts of similar additives, no additives are canceling each other out, or affecting each other's behavior.
Is like doing dishes with 2 different types of dishsoap, or laundry with 2 different types of laundry soap. It'll still work well.

About the mixing, it takes a LONG time for oil to settle (heavy on the bottom, light on the top) once they have been mixed.
However, as soon as the engine goes into motion, the oil gets stirred, and since it's oil with oil mixed, they will bond on a molecular level; so you will have no real problems with lighter oils layering on top of heavier ones, for more than perhaps 10-15 seconds at engine startup; which really only helps a better startup if the effect was there.

I don't know about the vespa, but on any chinese scooter, and motorcycle I haven't had any adverse effects on mixing oils.
Not even on my Honda Shadow VT750