Your Motorcycle Engine. Can Synthetic Oil Be Switched to Regular Oil?

Spectro Performance Oils is anwering your question.

“Yes, synthetic oil can be switched to regular oil in an engine. And vice versa: the oil type can be switched as often as desired. Both synthetic and regular oils lubricate engines internally, providing a barrier that prevents metal-on-metal contact inside the engine.
When synthetic oil started gaining popularity, it was thought that it would harm your engine to switch between it and regular oil. It is now believed that not only is switching harmless, but also in some circumstances it may be advantageous. Some synthetic oils are synthetic blends, which include regular oil mixed with synthetic. As these semi-synthetic oils are a blend of the two types, riders should experience no issues from switching between oil types.
It has been stated that when synthetic oils were first introduced, switching from synthetic to regular oil caused leaking, mostly as a result of different seal-swell rates of the oils. However, these issues have since rectified, and there are currently no problems due to switching back and forth. Spectro Performance Oils.”

9 Responses to “Your Motorcycle Engine. Can Synthetic Oil Be Switched to Regular Oil?”

  1. 1 Call me Rabbit Jul 2nd, 2011 at 11:05 am

    Now the age old question: Synthetic vs. Regular

  2. 2 burnout Jul 2nd, 2011 at 12:19 pm

    It is either synthetic or not synthetic. I do not like the term “semi-synthetic”. peace

  3. 3 Boomer Jul 3rd, 2011 at 10:23 am

    Gotta luv the oil debates. I doubt anything is more debated than oil.

    If I remember right; Semi-Syth is 30% synthetic and the rest dino. The advantage for motorcycles is believed to involve wet clutches sharing the same oil as the engine. What I don’t understand is why some, maybe all, synthetics, with the right friction modifiers, still cause clutch slippage. I guess that’s a discussion for another time…

  4. 4 bigalyts Jul 3rd, 2011 at 4:21 pm

    The Question is why would anybody change from Synthetic to Non- Synthetic? Secondly why would anybody use Semi synthetic? Synthetic Oil does not mix with Oil, that is what the Experts say! If Synthetic is as good and preserving on Engine parts then Why Would anybody, even the “Old Timers” use conventional oil? The price of the Oil is less than $3 a quart less. What is the point of Oil “REVERSAL” ?

  5. 5 Richard Jul 3rd, 2011 at 4:57 pm

    Many years ago I had a 650 Yam that refused to shift well when hot. I put in golden spectro and it was like night and day. Within 6 miles or so it shifted very easily and smooth. I had a need and the synthetic blend worked. However, I now own Harleys and use their regular multi-vis in the engine….works great for my riding style and conditions. Harley also has a blend and full synthetic available but both carry stiff price pentalies. Based on my personal experience, I don’t see the need/justification of the added cost. I think if I lived in the desert and it was 110 degrees, and i ran high oil temps, I’d spend the extra money for the best protection (oil film strenght, lubricity value and best viscosity control). In my case however, I don’t see the need. With respect to the “interchangability issue, I have a friend who has been “mixing his own” (petroleum/syn.) for years with great success. he puts a lot of miles on and has not had engine wear issues.

  6. 6 Doc Robinson Jul 4th, 2011 at 7:49 am

    Oils IS oils!

  7. 7 L.C. Jul 5th, 2011 at 10:43 am

    What about the clutch when changing? If both oils have addative packages for wet clutch will it be ok? In the past I have seen motorcycle become stationary vehicles when changing from non syn. to full syn ?

  8. 8 Bean're Jul 5th, 2011 at 12:50 pm

    I have been running Spectro full synthetic for the last 100,000 of my 270,000 miles on my evo. I can tell a difference and and very happy. The oil ALWAYS looks new when I check it where as the regular oil turns black VERY quickly. Then the truth lies in the motor- still going strong despite the harsh conditions I subject my bike to.

  9. 9 CafeSportyTC Jul 5th, 2011 at 1:58 pm

    Synthetic oils quite often have a smaller molocule makeup, which allows for a better more evenly distributed film of oil. in my opinion which is only that an opinion, why would you want to mix those two anyways? The smaller molocules may help fill the holes that dino oil has between molocules but to me you’d be better off running straight dino or straight synthetic. I would use synthetic though , just a preference

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Cyril Huze