Hey guys, I was wondering what you guys would suggest for oil wieght in my car. I have a '93 FD and the tempature outside ranges from 30-60 degrees currently.
Also, I have seen a lot of arguments over whether to use synthetic or non in rotor engines. I did a search and came up with too many different ideas on what to use.
What would be the best oil wieght to use for my situation?

Ohh the only mod I have is an intake currnetly, if that makes a difference.

Thanks
Justus

 

I use Valvoline 20w50, but that's me...

 

Mobil1 15w-50 full synthetic all year 'round.

 

This has been discussed a lot.

https://www.rx7club.com/forum/search...der=descending

 

OMG, not another oil debate!!!

 

yeah, what he said....

 

So what Porsche did you have before the Rx7?

 

what Jonski said

 

I have owned a 944, a 930, and I currelty have a 914.

 

all cool but 996's and 911's are where its at!

 

A 930 IS the ORIGINAL 911 TURBO!

 

Mazda Recomends 10w-30 for all but the COLDEST climates the xx-50's are too heavy for a street driven car. run 10w-30 Dino or 5w-30 Synthetic. 50 weight oils are for cars that are raced and operated at higher than normal oil temps, or built w/ larger than std bearing clearances.

 

Hey thanks for the input mazpesce. So you suggest 10w-30 for my car then, right?(it is street driven) and is that non-syn. or syn.?
I have read that synthetic is fine for rotaries.

 

Mobil 1 15W-50 hands down and enough said

 

imo, 50 weight is too viscuous. guess the choice depends on what you think protects more, higher oil pressure(50) or more oil flow(30).

 

Mobil 1 10W 30.

 

I use Castrol GTX. I'm thinking it was 20W-50 too.

 

10w-30! (in live in temps ranging from 40+ at night during the winter to 105 during the day in summer)

 

n2trbl, you've got mixed opinions here, so what you gonna do now? Still no gratitude I see...

 

Mazda may recommend thinner oil for emissions reasons. I don't know if thicker is better, but many people "in the know" have been recommending 20W-50 for a while.

People run all kinds of stuff. When was the last time someone had an oil-related failure? I think there are a lot of good choices out there. You could do oil analysis and find out what works best for your car/environment, too.

-Max

 

I heard redlines synthetic oil is pretty good. The only problem with theirs is that after a long period of time it will back up the cat. conv. But the protection it gives is suposed to be outstanding. I guess replacing a cat. is better and cheaper than and engine. I don't know. Just what I heard. Check out Sport Compact Cars (magazine) project rx7. I think this is one of the places I read about redline oil. sleepR1: who am I supposed to be thanking in here?

 

use 10W30, anything over 10W40 is overkill on that cold weather.

 

well from what I have been reading you guys are recommending warmer temperature oils despite him being in a colder climate. For a 30 degree day you are not going to want a thicker 20W50 but rather a less thick 10W-10 or 5W-30. When you start your car in very cold weather its more difficult to get the thicker going throughout the system. I think you guys are off in recommending a 20W-50 weight for such cold temps. Its more of a summer oil. I live in Michigan and since Octoberish I've had 5W-30 in my car because I do run/drive the car around every 2-4 weeks if weather permits. So I like having a lighter weight because its better on start-ups in the very cold temps 20-40 degree temps around here.
When the weather gets warmer I am going to switch to a 10W-30 and I will probably try a 20W-50 during the summer months.

 

Hey, thanks ROTARYFDTT.
Thats was mainly why I was asking the question.
I want to know what oil weight to use in this colder climate when I get my oil changed.
I was also wondering if synthetic should be used in rotary, I have heard stories from both sides of the specture, but none of them ever came to a conclusion.
Thanks again for everuones input.
Justus

 

If you drive your FD under boost much expect to get fuel in the oil. I've said this many times in the past. I've had my oil analyzed (sp?) 4 times at Southwest Spectro Chemical.

All 4 times it had 10% fuel dilution in the oil. All 4 times I used 20W-50 (different brands). I forget the mileage that my car had exactly, but it was in the range of 40-50K miles, running stock boost levels

So with that info in mind I wouldn't recommend using 10W-30, it gets WAY TO THIN with a little gas in it. I wouldn't use it even in the winter.

Jeff