fyrstormer

I use AMSOil 5w30 (Group 5 synthetic) and my sparkplugs looked the same as everyone else's after 30,000miles of driving. Every argument I've heard about not using synthetic didn't hold up to even the basic chemistry I learned in school. I think it really boils down to: synthetic oil doesn't burn as easily, so carbon buildup is more likely if you don't rev the crap out of the engine from time to time. I'll happily take the tradeoff of increased risk of carbon buildup in exchange for better lubrication, especially as the engine ages and the oil-metering system becomes less reliable.

RIWWP

iTrader: (2)

^ And gasoline is the bigger contributor to carbon anyway.

TeamRX8

iTrader: (25)

if they didn't get it earlier in the thread then repeating it is pointless ..

Loki

iTrader: (1)

Group V oils are ester based, they burn very cleanly and make good solvents. They also have the property of sticking to metal surfaces, which means less metal to metal contact. They're usually expensive, that's all.

This is why we shouldn't be comparing regular to synthetic, we should be comparing oil groups between themselves. 'Synthetic', as a marketing term, is useless in figuring out what's in jug.

hoosier8

Dino oil for the sump. 2 cycle synth oil for pre-lube.

Rotaman

Yes there's no doubt that not all Synthetic oils are equal, some are by far better then others. I've personally been using Amsoil Synthetic oil in my Rotaries and all other vehicles for nearly 30 years now. Buy the best and you will get good results.

zerogunner

This is some interesting stuff. I had never heard of these different base stock groups before. Is there a way to get a list of different, common oil brands and their base stock group?

Nadrealista

yes redline and motul have good ester oils. I ran redline 5w-30 and their racing 30wt in my S1 for the track events...Excellent oils that will reduce friction and lower operating temperatures..they are $$ but worth it if you track the car, not really needed for daily driver...

Steve Dallas

Just because I'm curious, I took a sample of my oil last night as I changed it. I will send it to Blackstone for analysis. I has about 1,000 miles and one track day on it. I'll post the results when I get them back.

RIWWP

iTrader: (2)

https://www.rx8club.com/series-i-tec...m-here-184241/

Steve Dallas

And here it is.

https://www.rx8club.com/series-i-tec...2/#post4680969

Bottom line is it doesn't much matter what you use as long as you change it on an appropriate schedule for the type and viscosity of oil you are using.