silly synthetic oil question

[3bears]

so I have switched many vehicles from std oil to synthetic over my years. The only time I had issues was with real old cars that the dino was what kept the seals from leaking.
However at work the the other day we got a new to us Polaris for using in the park. It left the factory with synthetic, but previous owner went regular oil, our master mechanic was talking about flushing the system so we could use synthetic again.
He said,,,,and he says this is what the county road department does....when switching from dino to synthetic you have to flush the oil system first, then run synthetic for a few hun miles, drain it out, and refill

any of you ever heard that before ?

then I talked to another old wrench turner and he said, no you have to flush when going from synthetic to dino. not dino to synthetic.

side note, by coincidence, when I switched my T4r to synthetic, I had some cheap synthetic around used a new yota filter,, ran it for about 200 miles then did a change with the big yota filter and amsoil. Havent had an issue.

 

[SpidermanGeek]

he said, no you have to flush when going from synthetic to dino. not dino to synthetic.

This is what I've always been lead to believe.

With that being said, I've also switched many vehicles from std to synthetic with no adverse effects, but I've never switched from synthetic to std.

 

[98OzarksRunner]

I don't think it matters at all. New cars usually come with synthetic and people switch to dyno (or blend) on the first oil change. People buy used cars and then switch to synthetic (I recently bought a GX470 and put Mobil 1 full synthetic in it). Blended oil is, well, blended. There certainly would be no adverse reactions from mixing the oils.

 

[JayRolla]

so I have switched many vehicles from std oil to synthetic over my years. The only time I had issues was with real old cars that the dino was what kept the seals from leaking.
However at work the the other day we got a new to us Polaris for using in the park. It left the factory with synthetic, but previous owner went regular oil, our master mechanic was talking about flushing the system so we could use synthetic again.
He said,,,,and he says this is what the county road department does....when switching from dino to synthetic you have to flush the oil system first, then run synthetic for a few hun miles, drain it out, and refill

any of you ever heard that before ?

then I talked to another old wrench turner and he said, no you have to flush when going from synthetic to dino. not dino to synthetic.

side note, by coincidence, when I switched my T4r to synthetic, I had some cheap synthetic around used a new yota filter,, ran it for about 200 miles then did a change with the big yota filter and amsoil. Havent had an issue.

I love the OIL myths that online old school techs have created in this world. Bad seals may leak worse but dont cause them to fail. You can switch between and you dont need to flush.

3 Myths & Truths about Full Synthetic Engine Oil | Royal Purple

Five Common Engine Oil Myths

http://www.pepboys.com/car_care_corner/car_care_basics/maintenance/oil_myths/

Myths About Synthetics | About Synthetic Oils ? Mobil 1 India

Motor Oil Myths - Valvoline®

 

[baja1]

the "W" stands for "winter"...who knew? :thanks:

 

[AZBub]

Riddle me this, what the heck do you do if you run a blend???

A flush half the oil
B flush with Dino
C flush with synth
D Who cares

 

[02SE]

Suffice it to say that your 'Mechanic' apparently has no concept of Tribology.

Even the definition of what constitutes "Synthetic oil" has changed in this Country, since Mobil lost their lawsuit against Castrol.

 

[Nunyabiz]

That is complete nonsense.
Just drain the old out and refill with synthetic makes absolutely zero difference.

 

[jgue467]

Its not a silly synthetic oil question - just a silly question. :cowboy: