Dumb or not, I`m doin it!

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Hasbeen

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I`m changing my 278,000 mile 1987 Mazda RX/7 over to 15W-50 Mobil1 today with 8 Oz. of Militec 1. Previously been using Dello 400 15W-40 so the engine should be clean. I`m going to do a compleat flush of the oil system so I get all 8 quarts of Mobil1 into it.

Why?????

Because I want to and most people say I shouldn`t.
 
Well, I wouldn't do it. We have seen time and again on oil analysis reports that the SL generation oils seem to be much improved (at least thats my humble opinion) Lighter oils will give better economy and pump better thus minimumizing startup problems.

I planned to be using 40 wt oils at this point in time. Now I am looking at going to 20 wt. I just used a mixture of 20 wt and 30 wt redline oil in my 02 Sentra. That's not much a risk though bc it still comes out to be a 30 wt. oil. Your call, but it sounds like you really don't have a reason for going with it. Hopefully you will see some advantage to it though
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Why would anyone recomend you not do this? You are going from the best dino oil available to the best synthetic oil available. With the milage you have on the RX7 a heavy oil seems reasonable to me. I use 20w-50 in my 253,000 mile toyota. Don't know much about the miltec 1. I would use the Mobil 1 15w-50 but I am too cheap.
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I'm absolutely not a rotary engine expert, but I've heard a couple times over the years that synthetic oils cause problems with the rotor brushes or some such thing, and that Mazda itself says no syns. If this out to lunch, don't be bashful about saying so. Have you heard this or anything like it?
 
quote:
Originally posted by ekpolk:
I'm absolutely not a rotary engine expert, but I've heard a couple times over the years that synthetic oils cause problems with the rotor brushes or some such thing, and that Mazda itself says no syns. If this out to lunch, don't be bashful about saying so. Have you heard this or anything like it?
Click to expand...
Yes i heard this too. My friend with a brand new RX8 says the owners manuals recommends against synthetic oils.
 
Mobil 1 and Amsoil have always worked just fine in Mazda rotary engines....

I can remember back in the early 1980's when Amsoil was sponsoring Rod Millen and his first generation RX-7. He ran a twin turbo Mazda engine used in road rallies that generated about 600 hp. I never heard of any durability issues with that motor.

This urban legend started because there were certain types of synthetic basestocks that would leave hard deposits when they burned off. In earlier rotary designs, oil was used to lubricate the "apex" seals and as a result oil consumption of 1 quart every 1500-2000 miles was not uncommon.

The Mobil 1, 15w-50 seems like a good match for this engine. I'd probably start out with the Amsoil 20w-50 racing oil in a similar situation ....

TS
 
I'm not trying to talk you out of it and I can see by the mileage you are a long way away from warranty...

http://www.mobil1.com/index.jsp

I like Mobil 1 but if I were you I would stick with Delo 400. Good stuff and if it got you that far why mess with sucess.

Good luck either way. Nice ride and nice motor too!
 
Honestly I am an Amsoil dealer, but the time for a change came up and I do not have time to order and I`m going somewhere this weekend. I also have great respect for Mobil1. I guess I just want this engine to last as long as it possibly can, although it hasn`t done badly at this point. The militec 1 as from what I have seen makes metal to metal contact almost imposible. Baring any coolant leaks, (and I change my coolant regularly), It should last a long time.

I`m also hoping that because of the addition of the GTA Fuel enhancer (which made a new engine out of this car) as my wife says, and i have to agree, that the fuel delution might not be as bad due to more complete combustion. I have a Blackstone kit, so I`m going to do a UOA at 3,000 miles just to see where I stand. Unfortunatly I have no previous UOA to compare to.

I am not an additive freak, and this is the first car that I have used anything at all. But what I am using seems to do wonders. We will see.
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Hasbeen, you might want to preview this post: http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=27;t=000029

[ June 11, 2004, 07:40 PM: Message edited by: 59 Vetteman ]
 
I don't think I'd start out using the Militec, mainly because I don't know what sort of solid deposits it leaves when you burn the stuff??? The Mobil 1 by itself will burn and exhaust cleanly and won't cause any deposit issues.

TS
 
quote:
Originally posted by TooSlick:
I don't think I'd start out using the Militec, mainly because I don't know what sort of solid deposits it leaves when you burn the stuff??? The Mobil 1 by itself will burn and exhaust cleanly and won't cause any deposit issues.

TS
Click to expand...
I`ve been using it in my Merc 150 outboard for a couple tanks of gas, i`ve looked at the plugs the other day, and they are clean as a whistle, Running Amsoil HP Injector.

Sence I have your attention, because this is a bass boat, and running at WOT a lot, do you think I should use the interceptor oil or racing oil.
 
For a TC-W3 application, the ashless HP Injector oil is the stuff to use. I'd only use the Dominator oil for a highly modified racing engine that is torn down at least once a season....

I have no experience with the Militec; I just think the Mobil 1 will work fine by itself.


Tooslick
 
Well, anyway, the oil change and the Militec are a done deal, we will see. Oil preasure is allready better, it will take awhile for the oil injection to bleed through.

I`ll stick with the HP Injector, I gained about 200 RPM at WOT after awhile using it. And another 100 RPM after changing the lower unit to the amsoil gear oil, I`m a happy camper.
 
I know you already did this but DDDDDOOOOOOOONNNNNNNN'TTTTT

Synthetic and Rotaries just don't mix, you WILL have problems, Me and my friend both own RX7's for a while I had a Turbo II and he had a 3rd gen. we both went to synthetics and after 2-3 months we both started leaking and both ended up having to get rebuilds(seals)
 
Well, with 278,000 miles on this engine allready, I suppose if I have a problem I can blame the oil.

I also know several people using mobil 1 in there rotary`s with no problems with over 100,000 miles using it, and they wouldn`t use anything else. If I had a new RX/8 I would use a synthetic regardless of what Mazda said.
 
Hey Ray....
Ya, we're in escrow (30 days) Got our price. I'll be there by the 4th of July.....
Heard you were up there and saw the mural on the wall... Momma tows a trailer with that 4 banger Camry. I recently put in some semi-syn 15W40 and some Militec in the oil. Reading things here I wonder if that oil is too thick? That car is only 18 months old and has over 70,000 on the clock. Now have a check engine light, think it's the oxy sensor.....?
 
quote:
Originally posted by Chris B.:
Mobil 1 even says on their web site DON"T USE SYNS IN A ROTOREY ENGINE. Hope it works out though.
Click to expand...
Not true. Go to the Mobil product selector and choose any number of Rotary models. The selector will recommend M1 5W-30 and 10W-30...

[ June 10, 2004, 05:12 PM: Message edited by: jsharp ]
 
coosBay Dave, I have an 2003 Camry and I am running 15W40 in mine as well. Mine is also a 4cylinder! So far I think it has done best with a 5W40. I have tried 5W30,10W30,5W40 and now 15W40. It really like the Redline 5W40!
 
quote:
Originally posted by jsharp:

quote:
Originally posted by Chris B.:
Mobil 1 even says on their web site DON"T USE SYNS IN A ROTOREY ENGINE. Hope it works out though.
Click to expand...
Not true. Go to the Mobil product selector and choose any number of Rotary models. The selector will recommend M1 5W-30 and 10W-30...
Click to expand...
It might have been changed but I swear It said that on M1's website. It also said that the use of Mobil 1 will maintain the warranty except in Mazda Rotory engines. As God is my witness that is what it said.
 
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