Can I Return To Using Conventional Motor Oil After Using Synthetic Motor Oil?

I think you should not because in most of the cases there are a number of problems of oil leaking and other which can cause harm to your vehicle. Keep using Synthetic oil and this would be better. For more details click on the link: Oil use

I agree with Jannifer that the synthetic is by far the best oil to run in your vehicle. Just the extended oil change intervals make it pay for itself, not leaving out the better protection for your vehicle's engine. I run sythetic in 4 of my 5 vehicles. All that being said I see no reason why you can't return to regular oil with no problem. I have done so many times and have seen no ill effects.

Probably not a good idea. Synthetics are 'smoother,' for lack of a better term, and don't create as much sludge which robs your engine of not only power but mileage. Stick to the syns would be my advice.

With 45yrs of turning a wrench and also drag racing super comp an top alcohol DO NOT SWITCH BACK OK!! Why oil conventional or synthetic use different compounds (cleaning agents and molecular binders) and an endless list of agents 4 heat dissipation. Oil does two basic things lubricates between moving parts and dissipates heat. I personally use Castrol Syntec there is more spendy oil and very good oil (Lucas, royal purple) in the top alcohol car we use Lucas they (help pay the bills)

I drive 1000 miles a week and have switched back and forth many times with out any problems. I change my oil every 3000 miles. My currant car has 210,000 miles on it. I have done this for 20 years. I have often used Walmart oil. Most of the oil web sites ( Castrol, Valvoline ) say you can switch back and forth with no problems.

It makes no difference if you switch back and forth. Anyone saying so is spreading a myth that has existed since synthetics were first made. The truth is that at the core they are the same thing. Synthetics are just made by man not nature so they don't contain the flaws that lead to breakdown of viscosity and thermal sludging found in conventional oils. The only truth is that you wont benefit from using synthetics while not using them. They can even be mixed together no problem. If you don't believe this then what do you think synthetic conventional blends are? Use common sense people.

I had just changed the oil my girlfriends car and used Mobile 1 in it.  Forgetting that it is synthetic, I really did not want to keep putting Mobile 1 back in the car due to the price of it.  So when I returned to work the next day I asked my fellow mechanics, who have been working on vehicles for a combine of 25 years, if it was safe to return to conventional oil.  They said it would not damage the engine at all.  They said that both have the same structure base.  After that day I checked to see what kind of oil i have been putting in my own vehicle.  When I take it to the garage to get the oil change they use Mobile conventional in it.  But because I have a small oil leak in my 1995 Prelude, which has 241,000 miles on it, I have to keep adding a little oil every week between oil changes I have been putting Mobile 1 in it.  I have been doing this for probably a year now.  It has not affected my motor and it still runs great with the amount of miles it has.  So after all this I guess I could have answered my own question.  "Can you switch back to conventional after using synthetic?"  Yes You Can!

Synthetic /conventional blends answer this question for you...

I asked this same question to my company mechanic a few weeks ago. He said if I switch from oil to a synthetic I would have use it for then on with no going back to conventional oil.

Def not a good idea

NO!!!! After using synthetic you can never go back to using conventional unless you want to get a new car! I am glad I could help! And I hope (if you do get a new car) it's a nice one!