I was thinking on changing to sinthetic oil for the engine & trans. The car just reached 57,000 & Im shure the lady who had the car take good care of it. Because of the condition of the car when I got it.
Should I go ahead & switch to sinthetic or should I stick to regular oil?

I switched to synthetic Mobil 1 within the first year.
I use 5W30 with increased oil flow/pressure kit and only the best oil filters.

Yes, switch at any time. The consistency of a synthetic from fill up to drain is a beautiful thing. I wouldn't suggest increasing the change intervals by much though.

Here was my 94 SSEi that used a Synthetic Blend. This car at the time had roughly over 180K on the clock.





This is my 97 SSEi that used regular oil its entire life. This car at the time had roughly 92-94K on the clock.



Any questions? lol I say switch. It will do your motor good!!

In the case of the two motors above, ignoring the gasket in the lower, I'd have to say the 97 looks better. Your 94 shows signs of serious carbon and varnish buildup.

The point is not the 'look' anyway. The major point is longer change intervals and maintained protection. With synthetic you can do this.

The topic author was asking about risks. There is no risk in our experience to switching to synthetic at any miles. If there'* truth to that rumor, it doesn't seem to apply to our 3800'*.

Alex also asked about synthetic trans fluid. I'd suggest not doing that. There is risk that the fluid may be 'too slick' causing excessive slip in your trans. Stick to a conventional name-brand trans fluid, non-synthetic.

I know that it is a Series I, but I switched to Mobile 1 synthetic this year at 190,000 miles and have had no problems

I just pulled this from Wikipedia:

The pictures were meant to compare what Regular oil versus Sythetic oil can do for an engines internals. Besides, the 94 had about 100K more than the 97 so yes, there will definately be a little more carbon build up than that of a motor with less miles.

Is there a risk to changing over to Synthetic? Absolutely not.

I have used nothing but dino oil in all my cars all my life, and have never had any problems. I change at 3500 mile intervals, using Valvoline Maxlife. I think it'* just a matter of personal preference. There are, I'm sure, some benefits to synthetic, but the cost does not justify them, in my opinion. Go with what you think.

still using dino at 300K+, every once in a while I toss it around in my head to switch. Haven't pulled the trigger yet.