5w20 vs 5w30
This isn't a thread of synthetic vs non-synthetic.. or what brand to buy or not to buy.
Ive already been sold on Royal Purple but I'd like to see peoples personal preferences on 5w20 or 5w30, why one or the other. al ;) |
get 20 weight if you like being a peon to CAFE.
get 30 weight if you like more protection for your engine. My car currently has 10w30 rp, next oil change goes to 15w40 |
If you want to push your motor as much as possible without an early engine death then 5w30 or even Xw50 (replace the X with the number of ur choice, like 0, 5, 10, or 15) use straight grade only if ure area is pretty hot all year long.
If you're going to drive like your grandmother, redline like once per month, be part of the C.A.F.E. Supporter then go with 5w20 |
nycgps I'm in Nyc with you, figure 5w30 will hold up fine?
al |
plan b.
and yes it will do just fine. beers :beer: |
Originally Posted by swoope
(Post 2377044)
plan b.
and yes it will do just fine. beers :beer: al ;) |
I've used 20-50 at the track before.
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Originally Posted by Razz1
(Post 2377053)
I've used 20-50 at the track before.
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I was thinking of switching to 5w30 when it gets warm around here (80 plus). Right now it is about 40 or so.
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so if you are in a area like the caribbean (like where i am - jamaica) where it's hot all year round, you guys recommend 5w30 ?
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yep.
beers :beer: |
We are lucky up here in Canada, the local branch of Exxon (Esso) makes an oil with a 100% polyalphaolefin basestock, in 0w30 and 0w40 grades.
Of course, I'll also be going straight to Hell because it's one of themthere newfangled "synthetoids"....... |
Originally Posted by alz0rz
(Post 2376950)
nycgps I'm in Nyc with you, figure 5w30 will hold up fine?
al Read my Signature down there for what I use/have :) Im planning to switch to 10w40 in summer, 5w40 in winter months. but not until my stock of 0w30 runs out :) |
I've used 5w30 from the beginning with my 2004. At first it was because of the serious fuel dilution due to the original tune being over-rich. PCM revisions fixed that, but I stuck with 5w30, since it was the specification for the car in most markets outside of North America.
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what is the recommendation for track days? 10w40?
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i just used 5w30 RP and it seemed my engine was craving it. i'ma now on the w30 bandwagon
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Canola Oil Ftw !!!!!
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nycgps you got me thinking after reading your links.....so much so that friday im moving to 10w-30 so i dont have to worry about my hoopty and im good for the mazda corral at limerock on saturday!
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I use 20-50 only.
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Originally Posted by chrism
(Post 2474649)
nycgps you got me thinking after reading your links.....so much so that friday im moving to 10w-30 so i dont have to worry about my hoopty and im good for the mazda corral at limerock on saturday!
I guess I see you all at Limerock this saturday :) (trust me this time Im gonna clean my engine bay lol) |
did you buy the plate?
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I'm a dino oil peon at that ...
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Originally Posted by chrism
(Post 2474718)
did you buy the plate?
I just got myself the front & rear Autoexe adjustable end link. I cleared my PM box yesterday, can u send me the link again ? |
How about for SoCal? It's getting to be quite hot here since summer is coming up. I'm using 5w20 for now, but 5w30 will be better for the engine?
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Heavier oil will protect more because it retain more heat and build a heavier film in the chamber, so yes. In a piston engine if you go too heavy you get sludge, but I don't know about the 8. Either way 5w-30 isn't that heavy.
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Use 5w-20
USA: 5w-20
HOT CLIMATES: 5w-30 (74°F +) Why? If the oil grade is too thick it won't lubricate the contact between the APPEX seal and rotor housing. Misconception: there's a misconception going around that thicker oil = more protection. This is FALSE. Stop putting heavy V6 & V8(XW-40+) oil on a freaking 1.3L tighlty compact engine. Trust me I followed this fad and that's how my first RX8 went to shit. By the way: if you use THICK grade oil it will wear out your seals faster on COLD-STARTUPS. Trust me just use 5w-20 and pre-mix if your going to rip it in the Northeast states. It's how I maintain my RX8 as a daily driver and it fixed a bunch of my problems. Tips: 5w-30 is a big difference from 5w-20 on rotary engines. We're talking really tightly compact engines. If the oil is too thick it's flow rate may be slower. If your car is smoking blue on cold startups for a really long time MY POINT EXACTLY EDIT: If your claim is to use heavier oil as a method to maintain cool temperature on the engine. You suck.. Get a better radiator, better oil coolers or an early fan trigger. If you go with a cheap option such as just using thicker oil you are going to get CHEAP results. ALSO ALSO: I noticed from running several test that thicker grade oil has raised the engine load % on my engine. |
Lets see your data to support the claim that 5w-30 won't adequately lube the apex seals.
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Originally Posted by NotAPreppie
(Post 4878664)
Lets see your data to support the claim that 5w-30 won't adequately lube the apex seals.
5w-30 is perfectly healthy for summer drives but it will wear out your engine in the winter (40° and below) My personal recommendation is: Track: 5w-30(temps must be 65°F+) Winter/spring: 5w-20 + pre-mix if your ripping it. Anything heavier than 5w-30 will cause friction between the seals. You must remember the space between the housing and the seals is VERY small. Thicker grade oil will just get dragged by the seals and not flow in between the seals and the housing. Which is what we want. |
Aside from reviving an 11-year-old thread...
I do agree that 5W-20 is adequate for cooler climates. This is what I use for spirited DD and occasional AutoX. But some people have used XW-40 without issues, and in fact, I would use it if my car sees track time. You need that thicker oil for tracking where your RPM, load and temperature will be so high the thinner 20 oil will break down. See the UOA thread if you want data. |
I’ve been using pennzoil yellow bottle @ 10w40 as per the recommendation of several Rotary engine builders. I’m in FL so weather is typically near HELL conditions but right now it does dip into the 30s-40sF in the AM startup. I wanted to switch to something thinner for winter temps but honestly... the pour point of the 10w40 is freakin -38F!!!! As per the data sheet. I don’t think flow is an issue @ 40F in the morning. Lol. I run the car HARD daily as soon as it warms up. |
Originally Posted by Fijibluefg2
(Post 4878696)
I’ve been using pennzoil yellow bottle @ 10w40 as per the recommendation of several Rotary engine builders. I’m in FL so weather is typically near HELL conditions but right now it does dip into the 30s-40sF in the AM startup. I wanted to switch to something thinner for winter temps but honestly... the pour point of the 10w40 is freakin -38F!!!! As per the data sheet. I don’t think flow is an issue @ 40F in the morning. Lol. I run the car HARD daily as soon as it warms up. https://cimg3.ibsrv.net/gimg/www.rx8...e7d4dee1a2.jpg https://cimg8.ibsrv.net/gimg/www.rx8...0a75459131.jpg https://cimg7.ibsrv.net/gimg/www.rx8...6152ccd71f.jpg sorry pics are so BIG! |
Heck, in Florida you could probably go with 20w-40 or 20w-50.
I disagree with your engine builder that you should let it warm up for 5-10 minutes before driving it. The period from cold start to warm up is when a large amount of carbon is produced. Doing things to minimize this time (i.e. driving while keeping the RPM's under 4-5k) is a good plan. |
Warming up the car for 5-10 minutes accomplishes only one thing: wasting fuel.
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Originally Posted by NotAPreppie
(Post 4885871)
I disagree with your engine builder that you should let it warm up for 5-10 minutes before driving it...
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Originally Posted by RichieR
(Post 4885876)
Ok, thanks for your input. In his defense, he never told me to let the car warm up for 5-10 (just the part about 10/40)
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Love my 5W-20, now in its 14th year of exclusive use in my ‘05 RX-8. ❤️
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Are we rehashing the oil wars again? Mobil 1 0W40 for me, changed every 3K miles, with a filter change every 6K miles.
Originally Posted by New Yorker
(Post 4885933)
Love my 5W-20, now in its 14th year of exclusive use in my ‘05 RX-8. ❤️
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I currently have 60+k and I am sure my car has only ever seen 5W-20. Works fine. I don't track or live in a hot climate, though.
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Originally Posted by Steve Dallas
(Post 4885941)
Sure, but don't you have something like 5 miles on your car?
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Originally Posted by New Yorker
(Post 4885944)
Yeah, something like 5 miles. Lemme check... oh, 47.5K miles. You’re only off by 46,995 miles. But hey, why let facts get in the way of a long-standing false rx8club.com narrative, right?
I'm not a hater; I love my 8. But, I do deal in facts, and many people would expect a 14 year-old car to have ~160K miles on it. Forty-eight thousand is much lower than average for a car of that age, and I find it a bit disingenuous to report only the car's age. . |
Originally Posted by Steve Dallas
(Post 4885949)
I'm not a hater; I love my 8. But, I do deal in facts, and many people would expect a 14 year-old car to have ~160K miles on it. Forty-eight thousand is much lower than average for a car of that age, and I find it a bit disingenuous to report only the car's age.
Got it. |
Originally Posted by New Yorker
(Post 4885959)
So, in other words, 14+ years ownership without a single engine problem doesn’t really count if there are only 47.5K miles on the car. 14+ years ownership with no engine problems is only meaningful if said car has 160K miles on it. Or, put another way, 47.5K miles with not one engine problem ain’t news for the Renesis if I took my time racking up that mileage. Because... because... having many days off between rides gave my car time to magically heal itself of any developing compression issues! Instead of my seals wearing down like so many Renesis seals allegedly do (well, the ones we read about on internet forums, anyway), mine, sitting quietly in a dark garage for four, five, six, maybe ten days between rides, had a secret advantage! They could magically restore... yeah, that’s it, restore themselves back to spec, not unlike the way Christine could heal and renew herself overnight in what I used to think was a fictional movie!!!
Got it. There are parts that are more related to age, like a bunch of plastic parts(although more heat cycles still would break them faster) and brake fluid, but engine wear is definitely mileage related. The less you drive it, the less wear there will be. There are zero problems I see with that logic. No one said your car will magically heal itself. The point is that your car will very likely have less wear than Steve's or my car because we have more mileage. And there is a reason oil threads always go to shit. Just realize each person's use case is different so one choice that works for one person won't work for another. As long as you have a valid argument behind your reasoning, keep doing what you are doing, and just agree to disagree with others. |
10w 40 in my 05 RX8, weekend runner only as I have a work vehicle so look forward to my weekends big time to put my baby through her paces.
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Mine is coming up on 130k miles. I bought the car with around 70k miles, still original engine. Only ever used 5w-20.
I try to keep oil change frequency to around every 7,000 miles. I'm debating whether to even pursue the Sohn modification at this point. |
Originally Posted by New Yorker
(Post 4885959)
So, in other words, 14+ years ownership without a single engine problem doesn’t really count if there are only 47.5K miles on the car. 14+ years ownership with no engine problems is only meaningful if said car has 160K miles on it. Or, put another way, 47.5K miles with not one engine problem ain’t news for the Renesis if I took my time racking up that mileage. Because... because... having many days off between rides gave my car time to magically heal itself of any developing compression issues! Instead of my seals wearing down like so many Renesis seals allegedly do (well, the ones we read about on internet forums, anyway), mine, sitting quietly in a dark garage for four, five, six, maybe ten days between rides, had a secret advantage! They could magically restore... yeah, that’s it, restore themselves back to spec, not unlike the way Christine could heal and renew herself overnight in what I used to think was a fictional movie!!!
Got it. If you don't drive the car, the seals don't deteriorate. So the only thing that matters is mileage, of which you have an unremarkable amount to claim some superiority over other owners whose engines have failed, or over the notion that engines fail. |
And speaking of seals... I think oil won't make as much of a difference once sprayed into the combustion chamber. The bearings will be more sensitive to the viscosity of the oil.
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Originally Posted by 0-TO-100_Real_Quick
(Post 4885982)
Mine is coming up on 130k miles. I bought the car with around 70k miles, still original engine. Only ever used 5w-20.
I try to keep oil change frequency to around every 7,000 miles. I'm debating whether to even pursue the Sohn modification at this point. |
Mine sees track days and autocross several times per month for 9 months of the year. I run Castrol Syntec 0W-40 changed every 2k miles with a filter every 4k.
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Originally Posted by Loki
(Post 4885984)
I don't get it, are you arguing against your own point?
If you don't drive the car, the seals don't deteriorate. So the only thing that matters is mileage, of which you have an unremarkable amount to claim some superiority over other owners whose engines have failed, or over the notion that engines fail. Got it. |
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