Syntheic 2-stroke oil vs conventional Any difference?

[drchpete]

Is there any reason I should not use synthetic 2-stroke oil in my 2000 Yamaha 40, or my 2003 Yami 9.9? I've always used conventional but was given a brand new quart of synthetic. What about mixing conventional with synthetic?

 

[robert graham]

Endlessly debatable subject, but that said, I've used the Pennzoil 100% Synthetic oil in my C90 Yamaha for many years and I feel it smokes less and may offer some benefit regarding less carbon on plugs and pistons....

 

[Chris1956]

1) Most 2 cycle OBs call for TCW-III certified oil. Unless your motor calls for a synthetic TCW-III, you can safely use either conventional or synthetic 2 cycle oil.

2) Some say the synthetic-blend 2 cycle oil smokes less. However, I have found that the amount of smoke produced by a particular oil to be difficult to quantify.

3) Usually dino oil is cheaper than synthetic or a blend. What does your wallet say?

4) Normally synthetic oil will mix fine with conventional oil.

 

[WIMUSKY]

I'd run the conventional oil down as much as possible, then add the synthetic...

 

[GA_Boater]

Dino and syn mix with no problems. Use your free quart of syn as long as it matches the requirements of your Yammis.

 

[dingbat]

I've run Dino, Semi- synthetic and full synthetics oils.

Your not getting Dino oil anywhere near my boat. The stuff works almost as well as ipecac. Keeps Champion spark plugs and Carbon Guard in business

I like full synthetic performance, but I don't like pouring $150 worth of oil in the tank every fill up.

Semi-synthetic is a great compromise between performance and cost. I run XD-50 at $22 a gallon, $66 a tank, at case lot price.

 

[Sea Rider]

I'd run the conventional oil down as much as possible, then add the synthetic...

Some OB brands manuals states not to mix 2 different TCW-3 2 strokes oil one on top of the other when switching to other brands oil, could experiment gelling issues which gives poor lubrication. Ideal is to burn most of the current fuel leftovers as previously mixed before mixing a different oil brand.

Happy Boating

 

[dingbat]

Some OB brands manuals states not to mix 2 different TCW-3 2 strokes oil one on top of the other when switching to other brands oil,

Part of tcw testing involves product mixing. No mix = no tcw certification

 

[Sea Rider]

Part of tcw testing involves product mixing. No mix = no tcw certification

Spot on answer, you always learn something new from others, was in boubt myself as sometimes don't go per manuals. Thanks.

Happy Boating

 

[keith2k455]

Use whatever and mix as available. I've never had a problem