RHC

I have been told to blend the synthetic with the dino oil for a few oil changes increasing the synthetic, then go all synthetic. What do ya say. Should a person just do a one time change from Dino oil to Synthetic or blend the two oils for a few changes?
IMO I was thinking just do a one time change over, but i could be wrong.

SSminnow

One time change is all you need. In fact, I have never heard of mixing dino and synthetic together during the same oil change.

annabelle

Just switch.

Driver920

i have always heard it is bad to mix the 2 so just change it

annabelle

You can blend the two, heck they sell it that way. Not to worry.

CD in NM

I'd just switch it over and be done with it. There are blends out there, most all the additives put into dyno oils are synthetic. But to go through the blending process yourself?? NAW, thats NUTS, just change it out.

CD

bluebull

Just switch it out. Your going by old school rules back when regular oils didn't have additives. Back then the engines would get gummed up (sludge) because the conventional oils didn't have or had very little additives. Todays conventional oils are so close to synthetic oils that they can be called synthetic and some companies do list them as synthetic.

coobie

I switched from chevron delo 400 15W-40 (dino)to schaeffers supreme 9000 5W-40 full synthetic with no problems about 25,000 miles ago.coobie

dodgerampone25

hello all what oil should i go with rotella15w-40, ac deco400 15w- 40or what else is out there thanks

txfiremedic

Heres ya a good reference:

http://www.turbodieselregister.com/TDR57_Oil.pdf

pet05

I will have to kindly disagree.

Synthetic vs. Conventional Oil = Night vs. Day

A synthetic oil's molecules are much more consistent in size and shape, they are better able to withstand extreme engine temperatures. By contrast, the unstable molecules in conventional oil can easily vaporize or oxidize in extreme heat. Mobil 1 synthetic is said to be capable of protecting engines "at well over 400 degrees F"; in the real world, most racers have no problem running synthetics up to 290 degrees F under prolonged use, but they get really jumpy when a conventional exceeds 270 degrees F.


An 0W-30 synthetic oil is capable of pumping easily at -62 degrees F and flowing at even lower temperatures. Conventional oils are essentially frozen solid at that temperature, so there's simply no conventional equivalent to this new grade. There are 5W-30 conventional and synthetic oils, but even here, the synthetic has a real-world advantage: Mobil 1's 5W-30 will pump at -58-degrees F, compared to about -35-degrees F for a conventional oil.