hi guys,
I went to the dealer for a 7500 miles service today. I was going to check my booklet see what's it included,but forgot. And when I picking up the car,I saw an oil change was performed on the work list.I would've bring my own if i check the book ><

I've been using mobil1 synthetic since 1st oil change. Will it be ok to use the conventional oil dealer put it till next oil change?

Thanks for helping

 

I was told to use regular oil until 10k miles

 

You want to dump that oil as fast as you can and put in synthetic again or at least tell them.

If you switch from synthetic back to mineral oil, it has the possibility of drying out the rings - the mixture of synthetic and mineral oil just happen to mess up somewhere. Anyway, I'd probably switch it to synthetic as fast as possible to avoid anymore damage.

-GDO

 

Did you mean 'seals' instead of 'rings'? I don't think you can dry out piston rings.

There used to be a story that switching back and forth between conventional and synthetic motor oil can cause a swelling of the rubber seals in an engine but I don't think this is true any longer. I would just change out the oil at your earliest convenience.

--
0==WW==0
"…axles of evil…" - george w. bush

 

wanted to bump this as this just happened to me, only at 45k service (only had synth since 41k, though). Any update on any consequences of re-introducing plain old old after running synthetic? I plan on switching it out soon, but work's a b***h and I haven't had time yet.

 

Synthetic and dino are fully compatible with one another. It will cause no problems to leave the conventional oil in until the next change.

 

It should be alright, but I would change it back to M1

 

Have independent studies been done, which show a significant change in the performance and wear and tear of the engine when a synthetic brand is used? Just throwing this out in the open...but, are synthetics a means for the castrols, mobil, and pennzoil folks to make more money?

 

monmon,
http://theoildrop.server101.com/cgi/ultimatebb.cgi

On that site you can learn more about oil and lubrication than you ever wanted to. The short answer to your question is, yes, synthetic is superior to dino. Having said that, I wouldn't pay extra to run it in most normally aspirated vehicles.