i have a simple question, is there a difference between synthetic oil and regular oil? and if you have used synthetic oil can you go back to regular oil? and is it true that Mobil oil is bad? thanks

 

Synthetic of course is man made and flows much better at cold temperatures and doesn't break down as easily in hot temps. I've heard that you shouldn't switch on a high mileage engine. Mobil 1 is the best.

 

I used Mobil regular oil in my 89 Toyota Truck and it had 165K trouble free miles before I got rid of it. It is more important to CHANGE the oil regardless of brand. I could use K-Mart oil and if I made sure it was changed regularly should have no problems. I'm not saying that buying brand-X over brand-Y is a bad thing if X is chaeper and Y protects better I would use Y because I don't always get to changing the oil right on time. I personally use Penzoil Synthetic Blend. I have 144K and no problems so far. It is also important to use a good filter. Do a search and you should be able to find a link to a site about different oil filter brands and their internals.

Good Luck

 

syn is better at extreme temps:
very cold - flows better
very hot - still provides protection

not really good to switch too often. but changing back and forth is ok.

Mobil-1 is good IMO.

 

mobil 1 is ok.but i think amsoil is better.

 

http://www.micapeak.com/info/oiled.html

Here's another good link. Look at the one below and other stuff in the "Knowledge" section

http://www.lubrizol.com/ReadyReferen...es/default.htm

 

Full synthetic is the best. But it is expensive. Over $4/bottle here. I used a synth blend (Castrol Syntec Blend) for the life of my '91 SE. And got over 300,000 trouble-free (the engine at least ) miles out of it before I sold it last year.
A blend is a good compromise if cost is a factor for you.

 

i used to use castrol syntec blend, but ive started using mobil one. the only reason i switched is because of mobil one's rep as being the best. but i dont really see a difference.

 

No one would really see a difference unless they compared it to about 50,000 of mileage or if they were using it w/ severe duty(ie.. sc/turbo/nos)

http://www.micapeak.com/info/oiled.html

 

guys - have a very basic question (couldnt find it via search, amazing!)

I have a 93 VG30E Max...I'm looking to change the oil to Amsoil.
Looking for answers...(FSM ?)

1. How much oil will I need to put in 4/5 qts?

2. What grade of Oil (I live in Atlanta) 10w30 ?

3. Which Oil Filter will work best with Amsoil? Nissan or Amsoil?

thanks !