knight rex

i was reading the manual and i noticed for normal conditions, the oil should be changed every 7,500 miles. i dont see how thats possible. wouldn't the oil turn into sludge within 7,500 miles?

kersh4w

iTrader: (3)

i change the oil every 3k-3.5k miles.

i'd do it 5-6k if i were using synthetic.

i've heard of the later model m3s having an oil change every 15k miles, they run nothing but synthetics.

so, no. its possible for it to not turn into sludge. but if you are using dino... ah.. i dunno.

New Yorker

As I recall, the 7,500 mile interval is for what they define as "normal" conditions—but if you turn the page you'll see the chart for "extreme" conditions. Virtually all cars operate in "extreme" conditions, and the "extreme" interval is only 5,000 miles.

Regardless of whether or not the oil would actually "turn into sludge" at 7,500 miles, the Renesis may be more sensitive to oil condition than other cars; so changing the oil every 3 or 4 months (or every 3K miles) probably really is "cheap insurance" for an RX-8.

sosonic

Max, that I could see would be every 5,000 miles with synthetic and change the oil filter too. With Dino oil, 3,500 miles.

I think the oil filter is something that is being underestimated. I'm thinking the Amsoil oil filter might be the best bet.

I know there are some long life oils like Red line, Amsoil, etc... but, I would not take the risk on a RX-8 with leaving them in past 5,000 miles.

Razz1

Mine gets changed anywhere from 800 miles to 1500 miles

NgoRX8

iTrader: (1)

i religiously change my oil every 2500 miles using Castrol Gtx

NgoRX8

iTrader: (1)

lol, that's because you don't drive enough in the 3-month period.

kersh4w

iTrader: (3)

i had my oil changed at the end of january. im overdue for another oil change.

:/

ivory8

just be safe and spend the extra 25 bucks every 3k-4k miles...don't risk it

souljamcdiddy

+1

Even doing so It's usually very blackened and level is low but not low enough to be an issue. After 3,000 miles I will be nearly .5 to 1qt low on dip w/ no leaks. I use Castrol Gtx 5w20 as specified.

nycgps

iTrader: (1)

You cant, I repeat you CANT judge an oil by looking at its color.

Your oil turns complete black even after 500 miles.

kersh4w

iTrader: (3)

$25? where? my oil changes cost me $40.

they do put castrol gtx in there though.

knight rex

ok, thx alot everyone, i'll just go ahead and change it every 3K miles i see castrol gtx is pretty popular, any other oils you guys would recomend? oil filters?

tunerwannab

iTrader: (1)

I do 30-40 oil changes a day, the majority of new cars recommend changes every 5000-7500. Many people do 7500 and are just fine. Just remember that once you oil gets totally trashed once it will get dirtier faster every time after that do to sludge build up. I see oil that looks solid black after only 10 seconds of running in the engine. So it is just better to stay on top of it.

Razz1

Ja, but somehow I got 29k miles and I can't figure that out.

kersh4w

iTrader: (3)

sleep driving! you love it so much you dream about it, and then go out and drive.

nycgps

iTrader: (1)

My local Mobil station charge 19.99 For 5 qts of Oil change. They put their regular Mobil stuff in of course, For Mobil1 I think it cost 15 bux more not so sure.

I've seen some places can do Oil change for 17.99, 5 quarts, they give you those Shell oil That I think it cost like 1.25 or 1.50 @ local shops. Then a 1 dollar oil filter.

Castrol GTX selling at 8.99 for 1 Gallon I think. 1 Gallon should be enough more than enough for 1 oil change. Plus a decent oil filter hmm 5-6 bux ?

Or do the Autozone 5 Quarts of Castrol GTX + Fram Filter for 13.99

Stop being lazy ! Do your own oil change and save !

HiTMaNN

I finally learned how to do an Oil change and for some reason I feel more like a man then ever.

TeamRX8

iTrader: (25)

it's a rotary engine, not a piston/valvetrain engine

rotaries are much less oil critical, 7500 miles is more than adequate for general street use

ivory8

your not a man until you crank off your oil filter by hand on its first oil change.

HiTMaNN

Meh it is all the same

ivory8

=)
yes, we are all men. woo men! ughhh men! now wheres my steak???

TrochoidMagic

petrol oil...so cheap. i change my oil around every 2k-2.5k depending on condition.
valvoline is the name... or any cheapest SM grade on current sale.

on top of that, i tilt the car so i drain out 4.5 qts. yeah, i know i'm ****.

05rx8mazda

iTrader: (4)

I change my oil every 3-4 K miles depending if i have time
i run royal purple 5w-30

it takes my car several weeks for it to turn black it usually stays purple wish color for a while.. or amber if i put regular dino oil but ive been doin royal for 20K miles now

samyv2

I change my oil every 2 months regardless of the amount of Km's. It maybe a little over kill, yet I'm sure my engine doesn't mind it.