Mixing 2 Cycle Oils?

[KeyWestBoater]

I have a 2008 Yamaha 70 2 stroke. My oil tank is 3/4 empty. I have been using non-synthetic oil. Would it cause a problem to switch to synthetic at this point? Or is that a bad idea. Is there a real advantage to using synthetic? I've put about 30 hrs this past year and not used 1 tank yet.

Thanks,
KWB

 

[marquette]

Re: Mixing 2 Cycle Oils?

i switched my 40hp johnson over to synthetic when the VRO tank was about 1/4 full. it didn't seem to cause any problem. i ran about 3 gals of oil through before i sold it. i switched because synthetic polutes a little less.

 

[Silvertip]

Re: Mixing 2 Cycle Oils?

Synthetic smokes less, is a better lubricant, less carbon build up and as was mentioned, is a little more eco-friendly. You can switch back and forth anytime.

 

[Dhadley]

Re: Mixing 2 Cycle Oils?

When I bought my flats boat 1 1/2 years ago it had Yamalube in it. I added - and am using - Pennzoil synthetic blend, no problem what so ever.

That being said, years ago we were involved in some testing and found that on recreational carb'd motors the blend (at 50:1) protected as well as full synthetic (100:1). If you can change the gas/oil ratio (premix or programmed) then the full synthetic may be superior.

 

[KeyWestBoater]

Re: Mixing 2 Cycle Oils?

I think I will switch to synthetic since it's time to fill up the tank. I buy my oil at West Marine.

Thanks for all your replies.

KWB

 

[Chris1956]

Re: Mixing 2 Cycle Oils?

Keywest, Is that motor completly broken in? I had heard, but not confirmed that dino oil is preferred for breakin. Does you owners manual address this?

 

[KeyWestBoater]

Re: Mixing 2 Cycle Oils?

It's well past being broken in. The engine has 30 hrs on it.

Thanks,

KWB