84z28Camaro

Oil can't make power, it CAN allow your engine to have less friction which would make it run more efficiently and be closer to its theoretical power levels.

382ssz28

iTrader: (24)

The XPR 5W30 has 5 times the crush strength of any other oil. Combined with great bearings, (King Alecular) which also has incredible crush strength, will make a hell of a bottom end. I am an Amsoil dealer and have had no problems racing sleds and cars with their products. Amsoil is 99% impurity free. It leaves no deposits after the burn. This comes from their head engineer, the son of the owner. Royal Purple is formulated to lubricate and fight friction better as well as not break down under imence stress. When it comes down to it, the choice is yours as we don't have 30 engines to test for thousands of miles to see what works best. I use XPR 5W30 @ 7200rpms with 200HP NX and no problems. Good luck with your choice.

LTLRDSS

iTrader: (2)

i hate to be the nay sater, but i ran rp syn 5w30 and after 1k the oil was really black and smelled burnt. i drained it and for the first few seconds it was thick then to normal. i gc now

Lt1Porsche

iTrader: (6)

not to highjack the thread or anything but when I purchased my vehicle with 50K on the clock my first oil change was with Mobil 1 5w30. I knew that the mileage was a bit high to start but was curious to what it would do. Well after 2 weeks of running it I lost 2 1/2 qts through the exhaust. Ever since then I switched to castrol gtx conventional. I know that M1 runs a little on the thin side. Ive been thinking about running R/P but what do you guys think about this. Think it will hold it. Ive got 80K on it now. Its been a strong motor. Running 13.2's bone stock and its an A4. dyno'd just a hair over 300rwhp stock. it jsut doesnt like mobil 1.

thunderstruck507

iTrader: (18)

I used RP in my old 350, changed at 7-8000 miles and it was often still purple colored when drained

valvoline racing oil is supposed to be one of the best oils for old style cams I know, prolly good for these motors too

FranCisco

I love the Royal Purple products, I use royal purple in my daily driven 80k+ trans am and my procharged ls1 drag car. My dad runs royal purple in his 04 goat. Nothing but good things here to say about Royal purple.

Lt1Porsche

iTrader: (6)

I saw that valvoline racing oil in the store today. how does it compare to RP or M1?

99 2500

I use the XPR 5w-30 and am very satisfied with the very noticable difference over the castrol and Mobil synthetic oils I was using before.

andrew69_04

iTrader: (148)

amsoil in the bike, mobil 1 in the truck. Used the VR1 in my T/A and it always held up very well. Talked with a few oil reps about R/P and none of them recommended it, all had there reasons.