jay

is royal purple worth the price @ over 7 $ a quart, thinking of using it.

SilverGTV8

I do. Mobil 1 is good too.

I have/going to have RP for every fluid. It is already in the motor and tranny. When I get the gears done it will be in there too

HRnB

I use Mobile one. From what I hear synthetic is synthetic no matter what color it is.

luckythirteen13

i use mobil 1...cant really see the RP being that much better

roundman

I've used Royal Purple in my '88 Stang for many years now and I have been very happy with it and you know I've raced it really hard too.

bobby

AMSOIL

Deannostang

Check out these links for some quick answers:

http://royalpurple.com/engmasters/emc04.html

http://royalpurple.com/techa/whyrpa.html

http://royalpurple.com/arta/arta.html

http://royalpurple.com/techa/faqsa.html

By the way, Royal Purple is now offered at Pep Boys for around $5.99 per quart. Usually $1 more expensive than Mobile 1 which is also a good oil.

Amsoil is also a very good product: https://www.amsoil.com/performancete...971/index.aspx

Redline synthetic lubricants are also dynomite products:

http://www.redlineoil.com/products_m...3&synthFlash=1

Hope this gives you enough info on synthetics. My advice, USE IT!

ZachW04Stang

I would say redline is the best to go with. Its what I use and what I've always been told is the best. I'm sure there are great though. I only change my oil every 5000 miles and the oil is still pretty clean and not thinned out.