10w-30 for rx8
02-11-2009, 01:23 AM
#28
i live is southern california, the weather is mostly warm lowest probably around 40-50 C in the winter and 90-100C in the summer... ive been using 5-20, what do u guys recommend? ive been going by the manual since day one... 
03-11-2010, 06:08 PM
#32
Here's the big question for me, if my motor fails and I have documented 10w-30 oil changes.. How good of a defense do I have when they say "the manual states 5w-20, 5w-30". I really believe 10w-30 or 10w-40 is best, but at 60k is it worth the serious risk having them void out the warrenty and having a solid argument... Just curious about opinions on that
Ha, and bump to a 1+ year old oil thread
Ha, and bump to a 1+ year old oil thread
03-11-2010, 06:35 PM
#33
THE BITCH IS DEAD
Join Date: Sep 2005
Location: Dayton, Texas
Posts: 236
Likes: 0
Received 0 Likes
on
0 Posts
Sooooo
i live in southeast Texas (Houston), had my car since summer 05', been using Castrol gtx 5w-20, car runs fine. The summers are HOT and the winters aren't that cold, very few nights at or below freezing, although this last one had snow, which is an oddity around here.
Shall I stick with 5w-20?
Shall I stick with 5w-20?
03-11-2010, 07:24 PM
#36
Registered
Here's the big question for me, if my motor fails and I have documented 10w-30 oil changes.. How good of a defense do I have when they say "the manual states 5w-20, 5w-30". I really believe 10w-30 or 10w-40 is best, but at 60k is it worth the serious risk having them void out the warrenty and having a solid argument... Just curious about opinions on that
Ha, and bump to a 1+ year old oil thread
Ha, and bump to a 1+ year old oil thread
03-11-2010, 08:14 PM
#37
Registered
iTrader: (3)
Join Date: Nov 2007
Location: Sac CA
Posts: 380
Likes: 0
Received 0 Likes
on
0 Posts
Buy your oil at Walmart. Their receipts dont specify oil weight, just oil brand. So make sure you dont buy something obviosly synthetic like royal purple. I buy castrol gtx in 10w30
03-11-2010, 08:19 PM
#38
Registered
good idea.
03-11-2010, 08:26 PM
#39
i live in southeast Texas (Houston), had my car since summer 05', been using Castrol gtx 5w-20, car runs fine. The summers are HOT and the winters aren't that cold, very few nights at or below freezing, although this last one had snow, which is an oddity around here.
Shall I stick with 5w-20?
Shall I stick with 5w-20?
03-11-2010, 08:55 PM
#40
Registered
not doubting your guys oil theory, but is thicker really better?
I still dont get why summer requires thicker oil since engine temperature is regulated by the cooling system.
and also thicker oil means lower flow, so would it be slower to take all the heat out of the engine than thinner oil?
I still dont get why summer requires thicker oil since engine temperature is regulated by the cooling system.
and also thicker oil means lower flow, so would it be slower to take all the heat out of the engine than thinner oil?
Last edited by jasonrxeight; 03-11-2010 at 09:02 PM.
03-11-2010, 09:10 PM
#41
Registered
I think some of it might have to do with start up. Think of syrup in the microwave. If the oil is too thick when it's cold, it puts more wear on the engine until it's warmed up and flowing well.
However if it's too thin and the engine gets hot (running it hard or whatever), the oil will start to break down and not protect as well...or something like that.
I think that's how it works.
Having two rotary cars, I should know this kind of stuff more than I do.
Last edited by ultrataco; 03-11-2010 at 09:12 PM.
03-11-2010, 11:46 PM
#42
Registered
well, the engine will be sucking in hotter air... how much difference it makes to engine temp, I don't know.
I think some of it might have to do with start up. Think of syrup in the microwave. If the oil is too thick when it's cold, it puts more wear on the engine until it's warmed up and flowing well.
However if it's too thin and the engine gets hot (running it hard or whatever), the oil will start to break down and not protect as well...or something like that.
I think that's how it works.
Having two rotary cars, I should know this kind of stuff more than I do.
I think some of it might have to do with start up. Think of syrup in the microwave. If the oil is too thick when it's cold, it puts more wear on the engine until it's warmed up and flowing well.
However if it's too thin and the engine gets hot (running it hard or whatever), the oil will start to break down and not protect as well...or something like that.
I think that's how it works.
Having two rotary cars, I should know this kind of stuff more than I do.
gets hot, I think the oil inside the rotary doesnt really get that hot comparing to a piston engine cuz its only to lubricate the gears and shaft.
too thick oil creates more ash thus more carbon build up
and I dont think it would get that hot since oil coolers would regulate the temperature too
Last edited by jasonrxeight; 03-11-2010 at 11:51 PM.
03-11-2010, 11:52 PM
#43
Registered
that makes more sense than how I tried to explain it.
...maybe it's a government conspiracy meant to confuse us all
maybe. that's beyond my level of knowledge.
...maybe it's a government conspiracy meant to confuse us all
gets hot, I think the oil inside the rotary doesnt really get that hot comparing to a piston engine cuz its only to lubricate the gears and shaft.
too thick oil creates more ash thus more carbon build up
and I dont think it would get that hot since oil coolers would regulate the temperature too
too thick oil creates more ash thus more carbon build up
and I dont think it would get that hot since oil coolers would regulate the temperature too
03-12-2010, 12:05 AM
#45
Registered
then I think higher velocity is better in this case.
03-12-2010, 11:15 PM
#48
Registered
This prompted me to look at my Pep Boys receipt from my last oil change. It only shows "Castrol GTX" (no weight), so I'm happy !
03-12-2010, 11:21 PM
#49
Registered
I think oil is magic.
gets hot, I think the oil inside the rotary doesnt really get that hot comparing to a piston engine cuz its only to lubricate the gears and shaft.
too thick oil creates more ash thus more carbon build up
and I dont think it would get that hot since oil coolers would regulate the temperature too
gets hot, I think the oil inside the rotary doesnt really get that hot comparing to a piston engine cuz its only to lubricate the gears and shaft.
too thick oil creates more ash thus more carbon build up
and I dont think it would get that hot since oil coolers would regulate the temperature too
03-12-2010, 11:22 PM
#50
One Shot One Kill
IF it comes down to it, use the chart you see in my link, it comes from japanese Mazda RX-8 manual and is as close to base as you can get with this car.
To answer some questions. the only time we need to really worry about the first number is if the weather routinely goes below freezing, if so, may want to run lighter W weight so the engine IS properly lubricated at start up. if 0W-40/5W-40 exist, i would recommend it for cars in the northern areas. for warm climates, 10W-30, 10W-40 is what i recommend.
To answer some questions. the only time we need to really worry about the first number is if the weather routinely goes below freezing, if so, may want to run lighter W weight so the engine IS properly lubricated at start up. if 0W-40/5W-40 exist, i would recommend it for cars in the northern areas. for warm climates, 10W-30, 10W-40 is what i recommend.