Can you swap from regular SAE grade motor oil to Synthetic motor oil in your car's engine without problems?

I've heard you have to drain all the oil first and replace it with just the synthetic variety. Is synthetic oil better for the environment? Is it better for engine performance?Can you swap from regular SAE grade motor oil to Synthetic motor oil in your car's engine without problems?
Mostly wrong answers.... You CAN mix the two.... why is it they make synthetic blends? DUH!...


Oil filters (don't use cheaply made and overpriced fram) don't have to be changed at 3,000 miles.... this is what most think because of the old 3,000 mile oil change belief..... oil filters (like wix) can do 7500 miles easy, the filtration gets better the longer it stays on. Synthetic can do longer oil intervals..... they have a better cold start pumpability and stand up to higher heat longer (don't go by the coolant temp, up around the rings it can fry conventional) it doesn't have smaller molecules.... it has all uniform ones... instead of conventionals more un-uniform ones.


75,000 miles being high mileage is a load of bull, its just to sell high mileage oils... which is a big no brainer...., if you have no leaks.... just change over to syn and watch for leaks... synthetics do not cover up damaged seals like conventional would. High mileage oils are good though, they have a good additive pack. Pending no problems with the engine like coolant leaking into the oil (you may not even notice it by looking at the oil) or overheating problems.... I'd run it for 6 month oil changes. And yes it may up the mpg ever so slightly in SOME cases...Can you swap from regular SAE grade motor oil to Synthetic motor oil in your car's engine without problems?
Hi Mid nite,





It would be best to swap eng oils at your next scheduled oil change. but there is no need to go thru any extra steps, such as flushing the engine before switching over.





Synthetic oils or even synthetic blends do have some advantages, but of course cost isn't one of them.





Synthetic oils are designed to last longer, perhaps extending your oil change intervals, and it does actually increase your fuel mileage by reducing friction inside the engine, albeit not a great deal.





By extending the oil changer intervals, there is less waste oil to dispose of, but then again, this waste oil is also recycled and re-used as well.





Jerry Christopher


http://www.usedcarwise.com
You can go longer in between oil changes. That is about the only difference.
sure, no problem, change filter too.
Never mix the two.
It depends on the number of miles on your car. If it has over 75,000 miles, don't change, you will be wasting your money. It is better if your car has less than 50,000 miles to change over, and then, yes, you have to drain and fill with a new oil filter. An alternative is parasynthetic which is a mix of SAE and synthetic. It is cheaper and you reap some of the rewards of synthetic. Better for the environment....only if you get better gas milage, but the oil is still oil. Synthetic will help your engine run cooler and with less friction(usually), and is intended to stay in the engine for 5000 miles, but you still have to change the filter every 2500-3000miles, then add oil for the loss in the filter. We use synthetics in the race car, as it runs cooler and gets about 1.5 more HP at top end, where it counts.
I use a blend of both havent had problems with it.
From what I've heard it is not a good idea to switch to synthetic on a high mileage engine. I have been told that if you have worn seals they will leak with synthetic and not SAE because synthetic has smaller molecules that will slip past worn seals easly. Synthetic oil is really just recycled oil. Oil never really goes bad. You have to change oil because of the contaminates that get into it over time not because the oil itself changes in any way. Any performance you would get is from using a thinner viscosity oil. Hope this helps.