nycgps

iTrader: (1)

when my engine warraty about to run out, I will visit dealership again. even if I have to pay for the compression test.

REDRX3RX8

Whether it's a thin oil or thick doesn't necessarily address disenintigration of the oil; that would be flash point.

When people say breakdown of oil, they mostly mean viscosity shears to thinner.

We basically run a thicker oil to get a head start on that thinning.

Bearing in engines run coolest with the thinest oil that does'nt allow metal to metal (keeps hydrostatic pressure floating the shaft).

However, after seeing bearing pics, and UOA's of car running 5w20, I can see that the front bearing is getting chrome worn off.

I wouldn't run any weight lower than xw40 in a car that I drive at full throttle.

REDRX3RX8

Just get on Mazda USA site, open up service log for your RX8, and list everything you do to the car (not that cold air mod, etc.) that's required in your owners manual.

List your oil and filter change as you do it which creates historical facts, and don't get into oil characteristics or if you do just list a 5w20 dino.

SpIcEz

You can use the "Prove its synthetic oil..." bit on them. Just dont be a dumbass and TELL them you used synthetic.

If they ask you used 5w20 dino. They wont be able to prove otherwise.

mikimazda

I have started with Motul X-Clean 5W-30 fully sysnthetic...and here in Austria ,dealer also use fully synthetic oil ,also 5W-30,Castrol or Mobil 1.
there is no reason NOT to use synthetic oil.

usnidc

My local mazda dealer I take my car to uses Castrol GTX 5w30. Since it is still under the 100,000 engine warrantee, I figure Mazda will have a hard time refusing the replacement if their dealer is puting something other than 5w20 in it.

iPodJohn

Will Helix 5w40 or 10w40 be okay for my rx8?
It has 40k on it and right now im runnin low on oil, sins i am at a village i dont got much choise of oil but the Helix HX7 5-10w40

Iluvrevs

Mine here in South Denver uses Valvoline 5w30 and has said I can use whatever as long as the viscosity isnt too crazy and the warranty will be fine. Obviously having them do the changes wont hurt if I need their backing and they said as much.

nycgps

iTrader: (1)

Its just sad that most dealership(not just Mazda, talking about ALL) are loaded with wrench monkeys.

only a few of them can actually "think like a human", I'm lucky I met one of the few.

40w8

I grew up selling Exxon, but always though shell was good, too.

I'd run the Shell Helix 10w40, myself with not any remorse, but be sure to add 6 to 8 ounces of motorcycle 2cycle oil to gas on every fillup of approx. 12 gallons.

paimon.soror

iTrader: (15)

So yesterday I made the switch from RP 5w-30 to my "summer" oil RP10w/40. Not sure if this is a good thing or a bad thing as I haven't quite grasped the concept of oil pressures and their affect through weight.

5w30
Accelerating - 90-110
Highway Driving - 90psi
Cold Idle - 30psi
Warm Idle 60psi

10w40
Accelerating - 110-130psi
Highway Driving - 100-110
Cold Idle - 30psi
Warm Idle 60-70psi

I know that my numbers look more like the "suggested specs" of the S2 engine with the 10/40, but is this necessarily a good thing?

Nadrealista

something is not right cold idle OP should be >> warm idle OP

If you spending $$ on syn oil I would go with Redline over Royal, they have better ester based oil for similar price..
their 5w-30 will give you protection of 10w-40 so you can drive it year round..

what is our oil filter bypass valve psi spec?

what is oil pressure relief valve psi setting?

paimon.soror

iTrader: (15)

Yikes im a dumbass, i just double checked, here we go:

5w30
Accelerating - 90-110
Highway Driving - 90psi
Cold Idle - 60psi
Warm Idle 30psi

10w40
Accelerating - 110-130psi
Highway Driving - 100-110
Cold Idle - 60-70psi
Warm Idle - 30psi

OEM filter and bypass (whic his greater than the S1)

Nadrealista

ok so I looked up purolator oil filter Relief Valve P.S.I. and it is rated at 14-18psi which is surprisingly low, my other car is Audi S4 oil filter is rated at Relief Valve P.S.I. 30-40psi.

paimon.soror

iTrader: (15)

The OEM filter for the S2 is rated at 20.3-26.1

paimon.soror

iTrader: (15)

*slowly puts on flame suit*

Anyone else notice how quickly the car starts up and how less rough the idle is with a 10w-40????

RIWWP

iTrader: (2)

Before anyone flames you, can you clarify?

You used "quickly" and "how less", which are generally comparative terms, but then only gave 1 oil weight. Are you comparing it to 5w-20? 20w-50?

And being that this is the Syn thread, are you referring to syn or non syn? and are you comparing it to the other?

paimon.soror

iTrader: (15)

Look at ch0o - always so generous with your lack of shooting flames

previously I was using RP5w-30 for 3k miles. Last night switched to 10w-40 as my "summer" oil (albiet living in NE i could just get away with a solid 5/30 year round)

Forget the quickly part as i understand that it is definitely a general term, but as far as the idling goes, I seem to have a much smoother idle. I turn on the car and I get none of the "put put put" ever once in a while. Turns right on, sits at cold idle 1k-ish very smooth, no vibrations.

I Was thinking it was placebo affect but I felt the same exact experience just coming home from work, just wondering if this is what others experience with heavier weight oils or if this is my car pulling a big fake-out-im-tugging-on-your-***** affect.

9krpmrx8

iTrader: (46)

It's just your imagination noob.

paimon.soror

iTrader: (15)

Btw I double checked, and my idle numbers are def like the first ones I quoted:

5w30
Accelerating - 90-110
Highway Driving - 90psi
Cold Idle - 30psi
Warm Idle 60psi

10w40
Accelerating - 110-130psi
Highway Driving - 100-110
Cold Idle - 30psi
Warm Idle 60-70psi

The low cold idle has always been the case compared to my warm idle.

Mind you this, from todays experience cold idle = 86F ambient, warm idle = 160F oil temp

Well then soak me in mustard and call me a french fry...

RIWWP

iTrader: (2)

It's not your imagination. The higher oil pressure has been seen to smooth out the revs at any point in the range, and the thicker weights will increase pressure naturally.

If this is your intended gain though, the oil pressure pellet mod is a better method than just increasing the oil weight, as it is directly targeted your desired area, and won't degrade over the life of the oil.

Not saying higher oil weight is bad.

Nadrealista

that is unimpossible

paimon.soror

iTrader: (15)

I dont believe the pressure mod works for us S2 guys though

Trust me I know, everywhere I read says I should be getting higher "cold" oil pressures. Does it matter that I am not grabbing my pressure from the filter (cant on an S2) an am getting it from the factory port on the side of the engine?

PeteInLongBeach

I do exactly the same thing with oil from season-to-season, and I have noticed almost no difference in running quality. Always starts and idles the same, never rough. I might have noticed that the cold accelerated idle seems a little higher, but that could also be related to higher seasonal ambient air temperature too.

wcs

iTrader: (2)

Bump
In hopes the noobs stop making new threads