<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

I don't know if it's true or not but someone told me that once you run a synthetic oil you always have to use it. They stated that it does something to the seals and gaskets that causes them to not work as well with standard oils. I think next time I'm going to try running 10W-40 in my engine. I just don't want it to overheat in heavy traffic. I have a 50 mile trip each way every day to and from work with a lot of that time sitting in expressway traffic. Is running the 10W-40 going to make the engine more succeptable wear and damage or should it be ok, I like to romp on the gas every once in a while and I don't want to wreck it.

<img border="0" alt="[Mr.T]" title="" src="graemlins/mrt.gif" /> Diggit!!

whoever told you that is living in the 70's. modern synthetics are 100% compatible with dino juice and all engine seals and gaskets. switching back and forth between dino and synth will cause no harm to any seals, gaskets, or the engine itself. the synthetic will hold oil pressure better at low speeds and hot weather, which is good if you are stuck in traffic. more oil pressure means a happier motor, because no metal to metal contact occurs. synthetic will not harm the motor in anyway. actually, the sportie likes synthetic, as people here have demonstrated. and you do not need to "flush" your motor out before switching to synthetic. mechanics nowadays will try to pull anything over your eyes to make a buck, and in the process they will actually make you believe that what they are saying is true.

matt
Mobil 1 10w-30

</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by cmslick3:
<strong> <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Is running the 10W-40 going to make the engine more succeptable wear and damage or should it be ok, I like to romp on the gas every once in a while and I don't want to wreck it.

<img border="0" alt="[Mr.T]" title="" src="graemlins/mrt.gif" /> Diggit!!</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">ROFLMAO

That is way to funny, I have to romp on ours all the time just to make it go.....
If going to the dealer wasn't such a PIA I would like to go test drive another one just to see how ours drives compared to another one.

Changing the plugs and adding some gas treatment did help......

the only majoer difference between the way conventionals and synthetics work (i think) is that synthetic just don't leave as much gunk behind. there shouldn't be a problem using a conventional oil, but it will run smoother with a synthetic for longer. about the always having to run synthetics thing, nope, i've had to go back to conventionals a couple times due to the cost of synthetics, no problems with leaky seals or anything like that. the only thing that i've heard that synthetics do to seals is that they "conditions" the seals, but i have no idea what that means. the only place i will not use a synthetic is in the rear diff and that is because Jeff at Eaton told me that the LSD wouldn't operate as well with a synthetic oil.

dave <img border="0" alt="[Shiner]" title="" src="graemlins/shiner.gif" />

Also worth noting, pertaining to your concerns about not overheating in hot weather: Synthetics will handle much higher temperatures before breaking down and losing some of their lubricating ability. The point at which normal oil can experience viscousity breakdown is alarmingly close to the operating temperatures of some high-performance engines... The point at which synthetics break down, however, is so high that pretty much as long as your engine isn't melting, your oil is still good <img border="0" title="" alt="[Smile]" src="images/icons/smile.gif" />

Synthetic oil is pretty much superior in all ways imaginable.

Mine had bad lifter clatter when new and it would only do it when hot and idling for a while (long stop light). I took it to the dealer several time and what they figgered out was a plunger in the oil pump was to short and caused low oil presure at idle. They installed a longer plunger and the problem went away. If enough people complained about this there could be a service bulitin on this. It might be worth it call a dealer to see or ask the price on a fix.
Dennis