Royal purple is starting to suck
 

I've been using royal purple for like a year now. I've been using 10w-30. The problem is I heard from some people that royal purple in the oil industry is it kind of sucks. Also Royal purple keeps raising their prices. Before I got it at $5 a quart. Then at $5.50, then at $6.00, and now at $6.50 a quart. That price is just outragious.

It's royal purple synthetic 10w-30. Now I want something cheaper but still synthetic. Also I made a thread about switching from 10w-30 to perhaps a 5w-30 or even a 0w-30. What are the pro and cons of switching to a thinner synthetic oil??? and what I can switch to, 5w-30 or 0w-30?

Also what other synthetic can I substitute it for???

ok, so now I understand that
 

ok, so now I understand that staying with the 30 will do diddly for fuel economy.

The fuel economy oil that I saw was 0w-20 and 5w-20.

0w is best for start ups, because it flows the best at start up. 20 is better than 30 because it is a thinner oil.

The best oil would be 0w-20, but the main question is will my engine like 0w-20? or should I downgrade to 5w-20 and maybe that will work on my engine?

look what I
 

look what I found...

https://www.carwashmag.com/pdf/sept_2005/thicker.cfm

since I'm using 10w-30 and if I switch to 5w-20 I'll save 1% of gas.
I'm getting 28mpg and if I start using this I'll gain another .28mpg. Every little bit helps.

I have been using 0W-20
 

I have been using 0W-20 Mobil One in both the Prius and Del Sol. I also use it in the Del Sol Transmission. I can't quantify FE gains since I have used it since day one. I can say that I haven't had any problems and everything is running just peachy. In the Prius I change every 12-15k miles. I plan to do the same in the Del Sol which has about 4k on the oil right now. The increased oil change interval helps to offset the additional cost of the oil.

what is the recommended oil
 

what is the recommended oil for your car???
it's probably 5w-30 or 5w-20. Mobil actually says that if you use 5w-20 you can safely use 0w-20.

I doubt I can just go from 10w-30 to 0w-20, that is a huge difference.

matter of heat
 

you would just have to keep in mind your start-up and operating temps. Zero weight oil is good for starts in colder areas, but sometimes not so good for hot depending on your engine. The key is to have the oil thin enough to promote good starts, but not too thin to the point it doesn't stay where it needs to(in the bearings and such). On the other side of things, during operating temps you want the oil to be viscous enough to protect the engine, but not so much as to resist the movement of the rotating mass. It's really hard to say what could work in an engine other than the factory grade oil. I would say that if you live in a temperate climate and don't race your engine or anything, 0w20 or 5w20 should be ok. However, if you live in a hot climate, we're talking 100 degree summers, you're probably better off with 5w30.

my manufacturer is saying
 

my manufacturer is saying 10w-30 and 5w-30 is okay. The difference between those is the viscosity on warm up. I think I'll just go with 5w-20, that way the viscosity for warm up is thinner and the viscosity on a warm engine is good too. I'll also do 3000 mile changes, not to give the oil a chance to start to break up.

I live in a warm climate, there is no winter here. It's rare for 100 degree summer here. It stays 85-90 degrees.

you should be fine then
 

You'll be fine with 5w20 then. The cheapest synthetic oil I've seen is valvoline at around 4 bucks a quart. oh and FYI, if you're still looking for RP oil, mustangtuning.com has it listed at 5.48 a quart with free shipping to anywhere in the continental US. That's where I got mine. Just don't tell them you don't have a mustang... }:)

Re: what is the recommended oil
 

5W-30 is recommended for both of my cars.

I didn't recommend that you do anything. I just told you what I do. Similar to tire pressure. I don't recommned filling higher than the sidewall max pressure. But I typically overfill by 30-40%. In both cases, I have had no problems and I don't anticipate future problems.

Re: what is the recommended oil
 

I know that you don't want to be held liable or anything like that. I just take your advice and whoever else is doing things that thinks outside the box. My tire pressure is 55psi on a 44psi sidewall tire. I don't want to go beyond that. Next time I'll just buy a taller tire and do the same 55 psi. I think it would be safe for my car to go with 5w-20, the only difference between 0w and 5w is the warm up. I'm not making drastic changes with going to 5w, the only thing I'm changing is the viscosity on the warmed up engine. Either way it's a win-win situation, I'll pay less for better oil and I'll gain some fuel economy.

Re: you should be fine then
 

I'm not going with royal purple anymore. I heard enough bad stuff to switch back to Mobil 1. I heard that after 3k it starts to thin out. I also heard that it breaks down way before Mobil 1 breaks down. Also the prices are crap. All I'll do is go to Wal-mart and get a 5 quart Jug of Mobil 1 for $20.

synthetics
 

I used Catrol Syntec or Syntec Blend and it seems to do well in my Geo at 7000-8000 mile oil changes adding a quart during that time as well. Mobile 1 has gone down in quality/service life and if your engine calls for 30w and you use 20w then you are running out of lubrication and will wear your engine out really fast on hot days. You are better off with keeping it in longer as long as it is slippery between your fingers and doesn't reak of blowby gasoline and you can still see the dip stick through the oil. If you want to really stop wasting money and are going to keep the car for several years then go crazy like I did and go with Synlube and forget about changing your oil ever again. I am still getting used to the idea that I don't have to get under the car again for 3 years until the 36,000 mile filter change. I hear that Royal Purple is supposed to built up ester deposits in the engine and is not good for street use or was that RedLine???

It doesn't really get that
 

It doesn't really get that hot here. I visited St. Louis in the summer and that was freaking hot. You couldn't even go outside without feeling you're out of breath.

In the summer it's 85-90 degrees here. I'll be changing my oil every 3k, doesn't matter what oil I use. So can I still use 5w-20???

20-30??
 

What the engine recommends is what you should use. The weight of the oil needed is a function of the oil temperature and how much cooling you get from the outside air and the load on the bearing surface that the oil pressure has to support. Too thin an oil and the bearings don't get the hydralic pressure needed to prevent metal to metal contact. Put a belly pan on and block the radiator and the engine temps go up. If you check the owners manual it usually will show you a graph of the heat range and the oil weight needed. The Synlube I have now in my xB is 5w50 and the manual calls for 5w30 but I don't have a problem with the 50 weight as it protects more and in this case doesn't drag the mpg down at all. Changing the oil while it is still good is just a waste of oil and money.

Re: synthetics
 

I think redline's base stock is a polyol ester, not to be confused with the cloth. I'm not sure about RP. I haven't heard about ester deposits before. Polyol esters are the base stock in jet engine oil. It's said to be more resistant to evaporating and extreme heat because their chemical structure has increase stability over conventional base stock, which are simply distilled crude oil.

Here's some Info: https://en.wikipedia.org/wiki/Motor_oil

damn everybody is saying
 

damn everybody is saying stick to heavier oil. Nissan sucks, their engines are designed for heavier oils.

Mobil 1 says the lowest I can go is 5w-30, and that is what everybody else is saying. So if I go to 5w-30 instead of 10w-30 my warm up will be better?

Quote:5W-30 is recommended
 

Even the prius? That bones, the insight is 0w20, :p

Re: damn everybody is saying
 

Not necessarily. Living where you are, it probably never gets below 40-degrees: which is where the 0w comes-in. Some owners manuals recommend a certain grade to use all the time or part of the year. Where the startup really counts is when it's below-zero outside and the car's been sitting outside all night. The thinner oil will pump more quickly to vital parts.

As for the second number, you probably want a higher number, especially if you have a hotter 'stat.

RH77
(KCØWPM)

IMHO, if you are going to
 

IMHO, if you are going to change your oil every 3000 miles and if you are going to stick with a 30 weight oil, don't waste your money on synthetic oil. Not only will you be wasting your money, you will be throwing out perfectly good oil and you will see no FE benefit.

Geez, if you hate you car so much and you keep saying that you are going to get rid of it, why are you putting so much money into it?

Re: IMHO, if you are going to
 

Because I don't know when I'll get rid of it. I've only spent less than $150 to gain 5mpg.
The reason I changed every 3k is because after 3k royal purple starts to thin out. And that is not good when my engine temp sensor is barely working and turning the fans on in the city all the time.