ok this is the first time i've used the wrong oil when i changed it.

I SWORE i picked up 5w-30 but as i was pouring it in today and about half way through, i saw it said 10w-30. too late to do anything about it now since it's half way.

what will this do to my engine? (it has about 71k miles).

can i revert back to 5w-30 on the next oil change?

I used Pennzoil Full Syn, how many miles can i go on it?

 

lol no big deal, just a slight difference in the weight that's all. Nothing will happen to your engine.

 

will the engine be hotter? since it's thicker viscosity?

can i go back to 5w on the next change?

 

You'll be fine.

 

I beleive 10w-30 is an alternative oil listed in the owners manual.

 

because of the high mileage on our 03 coupe we switched to 10w-30 for regular use.

 

You won't notice ANY difference unless it's 30 below where you are. And even then, probably not. Don't worry, you're fine.

 

I use 10-30 in my car with no probs

 

what state are you in?

I wouldn't want to use 10-30w in a cold/snowy climate in the winter..
but you should be fine.

 

thanks everyone. that puts my mind at ease.

i'm in cali, south bay, so it never goes below 45 degrees here.

oh how many miles can i go on full synthetic?

 

how come?

mine is 04 w/ 71k miles

 

High grade synthetic with a good quality oil filter - 5,000 miles.

 

i think that is little. my 03 corolla ran on regular oil and they said 5k, my 08 TLS used regular oil allowed about 5-6k. this is full syn, i think it should be much more, just not sure how much exactly.

 

IMO I doubt there would be any problems pushing 8k-10k miles on a high grade synth oil change with quality filter. I just recommend 5k (or 6k with quality oil filter) to people since that tends to be the interval I've used and i don't like recommending things to people if i haven't tried them first.

I personally use Mobil1 5w30 and Amsoil or K&N oil filter and change the oil every 10,000km / ~6,500 miles.